EHPRG: The European High Pressure Research Group

Welcome

 

Welcome to the official website of the European High Pressure Research Group (EHPRG).

EHPRG is non-profitable academic association established in 1963 which is devoted to science and technology of matter under high pressure. It organizes an annual meeting which brings together hundreds of scientists of various fields, mainly physics, chemistry, Earth and planetary sciences, bio- and food science and technology.

The reasonable size of the group, low conference fees, and a friendly relationship between the attendants have made EHPRG meetings a major event in the European high-pressure community for more than half a century.

Upcoming EHPRG Meeting

 


The Joint 28th AIRAPT and 59th EHPRG International Conference on High Pressure Science and Technology (AIRAPT-2021) will be held in Edinburgh, UK, from 25th to 30th July 2020. AIRAPT-21 will be chaired by Malcolm McMahon (CSEC and University of Edinburgh, UK).
For more information, please visit the official webpage of AIRAPT-21.

High-pressure in the headlines

 

Selection of high-pressure related titles from top scientific journals.

    Widespread haploid-biased gene expression enables sperm-level natural selection
    by Bhutani, K., Stansifer, K., Ticau, S., Bojic, L., Villani, A.-C., Slisz, J., Cremers, C. M., Roy, C., Donovan, J., Fiske, B., Friedman, R. C.

    Sperm are haploid, but must be functionally equivalent to distribute alleles equally among progeny. Accordingly, gene products are shared through spermatid cytoplasmic bridges which erase phenotypic differences between individual haploid sperm. Here, we show that a large class of mammalian genes are not completely shared across these bridges. We term these genes "genoinformative markers" (GIMs) and show that a subset can act as selfish genetic elements that spread alleles unevenly through murine, bovine, and human populations. We identify evolutionary pressure to avoid conflict between sperm and somatic function as GIMs are enriched for testis-specific gene expression, paralogs, and isoforms. Therefore, GIMs and sperm-level natural selection may help explain why testis gene expression patterns are an outlier relative to all other tissues.


    14 Jan 2021 at 7:47pm
    Driving energetically unfavorable dehydrogenation dynamics with plasmonics
    by Sytwu, K., Vadai, M., Hayee, F., Angell, D. K., Dai, A., Dixon, J., Dionne, J. A.

    Nanoparticle surface structure and geometry generally dictate where chemical transformations occur, with higher chemical activity at sites with lower activation energies. Here, we show how optical excitation of plasmons enables spatially modified phase transformations, activating otherwise energetically unfavorable sites. We have designed a crossed-bar Au-PdHx antenna-reactor system that localizes electromagnetic enhancement away from the innately reactive PdHx nanorod tips. Using optically coupled in situ environmental transmission electron microscopy, we track the dehydrogenation of individual antenna-reactor pairs with varying optical illumination intensity, wavelength, and hydrogen pressure. Our in situ experiments show that plasmons enable new catalytic sites, including dehydrogenation at the nanorod faces. Molecular dynamics simulations confirm that these new nucleation sites are energetically unfavorable in equilibrium and only accessible through tailored plasmonic excitation.


    14 Jan 2021 at 7:37pm
    Garnet sand reveals rock recycling processes in the youngest exhumed high- and ultrahigh-pressure terrane on Earth [Earth, Atmospheric, and Planetary Sciences]
    by Suzanne L. Baldwin, Jan Schonig, Joseph P. Gonzalez, Hugh Davies, Hilmar von Eynatten
    Rock recycling within the forearcs of subduction zones involves subduction of sediments and hydrated lithosphere into the upper mantle, exhumation of rocks to the surface, and erosion to form new sediment. The compositions of, and inclusions within detrital minerals revealed by electron microprobe analysis and Raman spectroscopy preserve petrogenetic clues...
    11 Jan 2021 at 9:20pm
    Nonideal mixing effects in warm dense matter studied with first-principles computer simulations
    by Burkhard Militzer
    The Journal of Chemical Physics, Volume FROST2020, Issue 1, January 2021.
    We study nonideal mixing effects in the regime of warm dense matter (WDM) by computing the shock Hugoniot curves of BN, MgO, and MgSiO3. First, we derive these curves from the equations of state (EOS) of the fully interacting systems, which were obtained using a combination of path integral Monte Carlo calculations at high temperature and density functional molecular dynamics simulations at lower temperatures. We then use the ideal mixing approximation at constant pressure and temperature to rederive these Hugoniot curves from the EOS tables of the individual elements. We find that the linear mixing approximation works remarkably well at temperatures above ∼2 × 105 K, where the shock compression ratio exceeds ∼3.2. The shape of the Hugoniot curve of each compound is well reproduced. Regions of increased shock compression, which emerge because of the ionization of L and K shell electrons, are well represented, and the maximum compression ratio of the Hugoniot curves is reproduced with high precision. Some deviations are seen near the onset of the L shell ionization regime, where ionization equilibrium in the fully interacting system cannot be well reproduced by the ideal mixing approximation. This approximation also breaks down at lower temperatures, where chemical bonds play an increasingly important role. However, the results imply that the equilibrium properties of binary and ternary mixtures in the regime of WDM can be derived from the EOS tables of the individual elements. This significantly simplifies the characterization of binary and ternary mixtures in the WDM and plasma phases, which otherwise requires large numbers of more computationally expensive first-principles computer simulations.
    9 Nov 2020 at 3:13am
    Stronger Interlayer Interactions Contribute to Faster Hot Carrier Cooling of Bilayer Graphene under Pressure
    by Kun Ni, Jinxiang Du, Jin Yang, Shujuan Xu, Xin Cong, Na Shu, Kai Zhang, Aolei Wang, Fei Wang, Liangbing Ge, Jin Zhao, Yan Qu, Kostya S. Novoselov, Pingheng Tan, Fuhai Su, and Yanwu Zhu
    Author(s): Kun Ni, Jinxiang Du, Jin Yang, Shujuan Xu, Xin Cong, Na Shu, Kai Zhang, Aolei Wang, Fei Wang, Liangbing Ge, Jin Zhao, Yan Qu, Kostya S. Novoselov, Pingheng Tan, Fuhai Su, and Yanwu Zhu

    We perform femtosecond pump-probe spectroscopy to in situ investigate the ultrafast photocarrier dynamics in bilayer graphene and observe an acceleration of energy relaxation under pressure. In combination with in situ Raman spectroscopy and ab initio molecular dynamics simulations, we reveal that i...


    [Phys. Rev. Lett. 126, 027402] Published Wed Jan 13, 2021
    13 Jan 2021 at 11:00am
    Evaporation-Induced Liquid Expansion and Bubble Formation in Binary Mixtures
    by Qiyun Tang and Marcus Müller
    Author(s): Qiyun Tang and Marcus Müller

    We observe an anomalous liquid expansion after quenching a binary mixture at coexistence to low pressures in the vapor phase by numerical calculations. This evaporation-induced expansion can be attributed to the pressure imbalance near the liquid-vapor interface, which originates from the interplay ...


    [Phys. Rev. Lett. 126, 028003] Published Wed Jan 13, 2021
    13 Jan 2021 at 11:00am
    Theory of Pressure-Induced Rejuvenation and Strain Hardening in Metallic Glasses
    by Anh D. Phan, Alessio Zaccone, Vu D. Lam, and Katsunori Wakabayashi
    Author(s): Anh D. Phan, Alessio Zaccone, Vu D. Lam, and Katsunori Wakabayashi

    We theoretically investigate high-pressure effects on the atomic dynamics of metallic glasses. The theory predicts compression-induced rejuvenation and the resulting strain hardening that have been recently observed in metallic glasses. Structural relaxation under pressure is mainly governed by loca...


    [Phys. Rev. Lett. 126, 025502] Published Tue Jan 12, 2021
    12 Jan 2021 at 11:00am
    Elasticity of a Pseudoproper Ferroelastic Transition from Stishovite to Post-Stishovite at High Pressure
    by Yanyao Zhang, Suyu Fu, Baoyun Wang, and Jung-Fu Lin
    Author(s): Yanyao Zhang, Suyu Fu, Baoyun Wang, and Jung-Fu Lin

    Elastic moduli (${C}_{ij}$) of single-crystal stishovite and post-stishovite are determined using Brillouin light scattering, impulsive stimulated light scattering, and x-ray diffraction up to 70 GPa. The ${C}_{12}$ of stishovite converges with the ${C}_{11}$ at $∼55\text{ }\text{ }\mathrm{GPa}$, wh...


    [Phys. Rev. Lett. 126, 025701] Published Tue Jan 12, 2021
    12 Jan 2021 at 11:00am
    Anomalous Behavior in the Nucleation of Ice at Negative Pressures
    by Valentino Bianco, P. Montero de Hijes, Cintia P. Lamas, Eduardo Sanz, and Carlos Vega
    Author(s): Valentino Bianco, P. Montero de Hijes, Cintia P. Lamas, Eduardo Sanz, and Carlos Vega

    Ice nucleation is a phenomenon that, despite the relevant implications for life, atmospheric sciences, and technological applications, is far from being completely understood, especially under extreme thermodynamic conditions. In this work we present a computational investigation of the homogeneous ...


    [Phys. Rev. Lett. 126, 015704] Published Fri Jan 08, 2021
    8 Jan 2021 at 11:00am
    Ionic Phases of Ammonia-Rich Hydrate at High Densities
    by Wan Xu, Victor Naden Robinson, Xiao Zhang, Hui-Chao Zhang, Mary-Ellen Donnelly, Philip Dalladay-Simpson, Andreas Hermann, Xiao-Di Liu, and Eugene Gregoryanz
    Author(s): Wan Xu, Victor Naden Robinson, Xiao Zhang, Hui-Chao Zhang, Mary-Ellen Donnelly, Philip Dalladay-Simpson, Andreas Hermann, Xiao-Di Liu, and Eugene Gregoryanz

    Mixtures of ammonia and water are major components of the “hot ice” mantle regions of icy planets. The ammonia-rich ammonia hemihydrate (AHH) plays a pivotal role as it precipitates from water-rich mixtures under pressure. It has been predicted to form ionic high-pressure structures, with fully disi...


    [Phys. Rev. Lett. 126, 015702] Published Wed Jan 06, 2021
    6 Jan 2021 at 11:00am
    Unconventional Superconductivity Induced by Suppressing an Iron-Selenium-Based Mott Insulator ${\mathrm{CsFe}}_{4−x}{\mathrm{Se}}_{4}$
    by Jin Si, Guan-Yu Chen, Qing Li, Xiyu Zhu, Huan Yang, and Hai-Hu Wen
    Author(s): Jin Si, Guan-Yu Chen, Qing Li, Xiyu Zhu, Huan Yang, and Hai-Hu Wen

    Under high pressure, the insulating compound CsFe4−xSe4 turns into an unconventional superconductor, suggesting this system is a good one for exploring deviations from traditional Bardeen-Cooper-Schrieffer theory of superconductivity.


    [Phys. Rev. X 10, 041008] Published Mon Oct 12, 2020
    12 Oct 2020 at 12:00pm
    Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide
    by H. Gu, F. Tang, Y.-R. Ruan, J.-M. Zhang, R.-J. Tang, W. Zhao, R. Zhao, L. Zhang, Z.-D. Han, B. Qian, X.-F. Jiang, and Y. Fang
    Author(s): H. Gu, F. Tang, Y.-R. Ruan, J.-M. Zhang, R.-J. Tang, W. Zhao, R. Zhao, L. Zhang, Z.-D. Han, B. Qian, X.-F. Jiang, and Y. Fang

    Rare-earth monopnictides are predicted to be nontrivial semimetal candidates and show pressure-induced superconductivity. Here, we grow LuBi single crystal and study the magnetization, transport behaviors and electronic band structures to reveal its topological semimetal feature and superconductivit...


    [Phys. Rev. Materials 4, 124204] Published Tue Dec 29, 2020
    29 Dec 2020 at 11:00am
    Beryllium polyhydride ${\mathrm{Be}}_{4}{\mathrm{H}}_{8}{({\mathrm{H}}_{2})}_{2}$ synthesized at high pressure and temperature
    by Takahiro Matsuoka, Hiroshi Fujihisa, Takahiro Ishikawa, Takaya Nakagawa, Keiji Kuno, Naohisa Hirao, Yasuo Ohishi, Katsuya Shimizu, and Shigeo Sasaki
    Author(s): Takahiro Matsuoka, Hiroshi Fujihisa, Takahiro Ishikawa, Takaya Nakagawa, Keiji Kuno, Naohisa Hirao, Yasuo Ohishi, Katsuya Shimizu, and Shigeo Sasaki

    We report x-ray diffraction and Raman scattering measurements in combination with density functional theory calculations that reveal the formation of beryllium polyhydride ${\mathrm{Be}}_{4}{\mathrm{H}}_{8}{({\mathrm{H}}_{2})}_{2}$ by the laser heating of a Be-${\mathrm{H}}_{2}$ mixture to above 170...


    [Phys. Rev. Materials 4, 125402] Published Mon Dec 21, 2020
    21 Dec 2020 at 11:00am
    High-pressure transformations in liquid rubidium
    by Simon Ayrinhac, Victor Naden Robinson, Frédéric Decremps, Michel Gauthier, Daniele Antonangeli, Sandro Scandolo, and Marc Morand
    Author(s): Simon Ayrinhac, Victor Naden Robinson, Frédéric Decremps, Michel Gauthier, Daniele Antonangeli, Sandro Scandolo, and Marc Morand

    An electronic-driven liquid-liquid phase transition in rubidium is revealed by picosecond acoustic measurements combined with ab initio calculations. Picosecond acoustics were used to measure the melting line up to 10 GPa, finding the maximum in the melting curve at 7 GPa and 555 K. We observe the o...


    [Phys. Rev. Materials 4, 113611] Published Mon Nov 30, 2020
    30 Nov 2020 at 11:00am
    Complete phase diagram of ${\mathrm{Sr}}_{1–x}{\mathrm{La}}_{x}\mathrm{Fe}{\mathrm{O}}_{3}$ with versatile magnetic and charge ordering
    by M. Onose, H. Takahashi, H. Sagayama, Y. Yamasaki, and S. Ishiwata
    Author(s): M. Onose, H. Takahashi, H. Sagayama, Y. Yamasaki, and S. Ishiwata

    A detailed electronic phase diagram of perovskite-type oxides ${\mathrm{Sr}}_{1–x}{\mathrm{La}}_{x}\mathrm{Fe}{\mathrm{O}}_{3}$ ($0≦x≦0.5$) was established by synchrotron x-ray diffraction, magnetization, and transport measurements for polycrystalline samples synthesized by a high-pressure technique...


    [Phys. Rev. Materials 4, 114420] Published Mon Nov 30, 2020
    30 Nov 2020 at 11:00am
    Facile dissociation of molecular nitrogen using lanthanide surfaces: Towards ambient temperature ammonia synthesis
    by J. R. Chan, S. G. Lambie, H. J. Trodahl, D. Lefebvre, M. Le Ster, A. Shaib, F. Ullstad, S. A. Brown, B. J. Ruck, A. L. Garden, and F. Natali
    Author(s): J. R. Chan, S. G. Lambie, H. J. Trodahl, D. Lefebvre, M. Le Ster, A. Shaib, F. Ullstad, S. A. Brown, B. J. Ruck, A. L. Garden, and F. Natali

    A combined experimental and computational study is reported on a hitherto unrecognised single lanthanide catalyst for the breaking of molecular nitrogen and formation of ammonia at ambient temperature and low pressure. We combine in situ electrical conductance and electron diffraction measurements t...


    [Phys. Rev. Materials 4, 115003] Published Mon Nov 30, 2020
    30 Nov 2020 at 11:00am
    Observation of $A$-site antiferromagnetic and $B$-site ferrimagnetic orderings in the quadruple perovskite oxide $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Co}}_{2}{\mathrm{Re}}_{2}{\mathrm{O}}_{12}$
    by Zhehong Liu, Xiao Wang, Xubin Ye, Xudong Shen, Yuecheng Bian, Wei Ding, Stefano Agrestini, Sheng-Chieh Liao, Hong-Ji Lin, Chien-Te Chen, Shih-Chang Weng, Kai Chen, Philippe Ohresser, Lucie Nataf, Francois Baudelet, Zhigao Sheng, Sonia Francoual, José R. L. Mardegan, Olaf Leupold, Zefang Li, Xuekui Xi, Wenhong Wang, Liu Hao Tjeng, Zhiwei Hu, and Youwen Long
    Author(s): Zhehong Liu, Xiao Wang, Xubin Ye, Xudong Shen, Yuecheng Bian, Wei Ding, Stefano Agrestini, Sheng-Chieh Liao, Hong-Ji Lin, Chien-Te Chen, Shih-Chang Weng, Kai Chen, Philippe Ohresser, Lucie Nataf, Francois Baudelet, Zhigao Sheng, Sonia Francoual, José R. L. Mardegan, Olaf Leupold, Zefang Li, Xuekui Xi, Wenhong Wang, Liu Hao Tjeng, Zhiwei Hu, and Youwen Long

    A quadruple perovskite oxide $\mathrm{Ca}{\mathrm{Cu}}_{3}{\mathrm{Co}}_{2}{\mathrm{Re}}_{2}{\mathrm{O}}_{12}$ was synthesized by high-pressure annealing. This compound crystallizes in an $A$- and $B$-site ordered quadruple perovskite structure with space group $Pn\text{−}3$. The charge combination ...


    [Phys. Rev. B 103, 014414] Published Tue Jan 12, 2021
    12 Jan 2021 at 11:00am
    Structural and electronic transition in liquid rubidium
    by D. Kartoon and G. Makov
    Author(s): D. Kartoon and G. Makov

    Rubidium, like the other alkali metals, exhibits multiple structural transformations in its solid phase upon application of pressure. Recent experiments and calculations suggest it also goes through a phase transformation in its liquid state, along the 573 K isotherm, slightly above its melting curv...


    [Phys. Rev. B 103, 024103] Published Tue Jan 12, 2021
    12 Jan 2021 at 11:00am
    Crystal and electronic structure of ${\mathrm{Co}}_{3}{\mathrm{O}}_{4}$ spinel under pressure probed by XANES and Raman spectroscopy
    by Yimin Mijiti, Kai Chen, João Elias F. S. Rodrigues, Zhiwei Hu, Lucie Nataf, Angela Trapananti, Andrea Di Cicco, and Francois Baudelet
    Author(s): Yimin Mijiti, Kai Chen, João Elias F. S. Rodrigues, Zhiwei Hu, Lucie Nataf, Angela Trapananti, Andrea Di Cicco, and Francois Baudelet

    Crystal and electronic structure of ${\mathrm{Co}}_{3}{\mathrm{O}}_{4}$ spinel have been investigated by x-ray absorption near edge structure (XANES) at the Co $K$ edge up to 58.5 GPa and Raman scattering up to 65 GPa. Several transitions have been observed upon pressurization, and the original stru...


    [Phys. Rev. B 103, 024105] Published Tue Jan 12, 2021
    12 Jan 2021 at 11:00am
    Pressure-induced superconductivity in trigonal layered ${\mathrm{PtBi}}_{2}$ with triply degenerate point fermions
    by Jing Wang, Xuliang Chen, Yonghui Zhou, Chao An, Ying Zhou, Chuanchuan Gu, Mingliang Tian, and Zhaorong Yang
    Author(s): Jing Wang, Xuliang Chen, Yonghui Zhou, Chao An, Ying Zhou, Chuanchuan Gu, Mingliang Tian, and Zhaorong Yang

    Materials with nonsaturating, extremely large magnetoresistance (XMR) attract continuous research interest due to their great potential in the fields of spintronics and magnetic sensors/switches. Here, we report the discovery of pressure-driven superconductivity (SC) in trigonal ${\mathrm{PtBi}}_{2}...


    [Phys. Rev. B 103, 014507] Published Mon Jan 11, 2021
    11 Jan 2021 at 11:00am
    Enhancement of electron correlations and spin density wave fluctuations of the organic superconductor $λ\text{−}{(\mathrm{B}\mathrm{E}\mathrm{T}\mathrm{S})}_{2}\mathrm{Ga}{\mathrm{Cl}}_{4}$ under pressure proved by $^{13}\mathrm{C}$ NMR
    by M. Sawada, A. Kawamoto, and T. Kobayashi
    Author(s): M. Sawada, A. Kawamoto, and T. Kobayashi

    We performed $^{13}\mathrm{C}$ NMR measurements on an organic superconductor $λ\text{−}{(\mathrm{B}\mathrm{E}\mathrm{T}\mathrm{S})}_{2}\mathrm{Ga}{\mathrm{Cl}}_{4}$ [BETS: bis(ethylenedithio)tetraselenafulvalene] to investigate the pressure effect on the spin density wave (SDW) fluctuations at low t...


    [Phys. Rev. B 103, 045112] Published Mon Jan 11, 2021
    11 Jan 2021 at 11:00am
    Laser-induced crystallization and phase transitions of ${\mathrm{As}}_{2}{\mathrm{Se}}_{3}$ under high pressure
    by Tomasz Jaroń, Vitali B. Prakapenka, and Viktor V. Struzhkin
    Author(s): Tomasz Jaroń, Vitali B. Prakapenka, and Viktor V. Struzhkin

    Utilizing the synchrotron x-ray powder diffraction ${\mathrm{As}}_{2}{\mathrm{Se}}_{3}$ has been investigated under high pressure in a diamond anvil cell with hydrogen and neon applied as the pressure media. For both systems the amorphous samples were compressed to ca. 2–3 GPa and heated in situ by ...


    [Phys. Rev. B 103, 014103] Published Fri Jan 08, 2021
    8 Jan 2021 at 11:00am
    Elasticity of single-crystal NaCl under high-pressure: simultaneous measurement of x-ray inelastic scattering and diffraction
    by Hiroshi Fukui
    Volume 40, Issue 4, December 2020, Page 465-477
    .

    17 Aug 2020 at 11:39am
    Melting and decomposition of orthorhombic B6Si under high pressure
    by Vladimir L. Solozhenko
    Volume 40, Issue 4, December 2020, Page 488-494
    .

    15 Oct 2020 at 11:47am
    Raman study of 3.65 Å-phase MgSi(OH)6 under high pressure and the bands assignment
    by Ulyana Borodina
    Volume 40, Issue 4, December 2020, Page 495-510
    .

    13 Oct 2020 at 7:43am
    Empirical constrains on volume changes in pressure-induced solid state transformations
    by Oliver Tschauner
    Volume 40, Issue 4, December 2020, Page 511-524
    .

    18 Sep 2020 at 4:53am
    Pressure media for high pressure experiments, Daphne Oil 7000 series
    by D. Staško
    Volume 40, Issue 4, December 2020, Page 525-536
    .

    28 Sep 2020 at 4:28am
    Challenging a range of high pressure processing parameters to inactivate pathogens in orange juice
    by Rodrigo Rodrigues Petrus
    Volume 40, Issue 4, December 2020, Page 537-542
    .

    13 Oct 2020 at 7:44am
    Optimization of antioxidant activity and bioactive compounds extraction of winter savory leaves by high hydrostatic pressure
    by Sílvia A. Moreira
    Volume 40, Issue 4, December 2020, Page 543-560
    .

    22 Oct 2020 at 6:21am
    High-pressure and high-temperature neutron-diffraction experiments using Kawai-type multi-anvil assemblies
    by Asami Sano-Furukawa
    .

    11 Jan 2021 at 5:30am
    The solubility behavior of NaCl in water at high pressure studied by neutron diffraction and Raman scattering
    by Qiwei Hu
    .

    4 Jan 2021 at 10:17am
    In situ electrical resistivity and viscosity measurements of iron alloys under pressure using synchrotron X-ray radiography
    by A. Pommier
    .

    29 Dec 2020 at 3:18am
    Pressure calibration based on the ultrasonic measurement in multi-anvil apparatus
    by Wei Song
    .

    26 Dec 2020 at 10:38am
    Preparation of SEM hydrogel samples using a high pressure water freeze fracture method
    by Hirofumi Satani
    .

    26 Dec 2020 at 10:35am
    Pressure tolerance of brine shrimp (Artemia)
    by Ryo Kitahara
    .

    15 Dec 2020 at 3:54am
    Clamp cells for high pressure neutron scattering at low temperatures and high magnetic fields at Heinz Maier-Leibnitz Zentrum (MLZ)
    by A. Eich
    .

    12 Nov 2020 at 7:18am