EHPRG

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.

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
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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
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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
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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
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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
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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
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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
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22 Oct 2020 at 6:21am
High-pressure and high-temperature neutron-diffraction experiments using Kawai-type multi-anvil assemblies
by Asami Sano-Furukawa
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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
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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
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29 Dec 2020 at 3:18am
Pressure calibration based on the ultrasonic measurement in multi-anvil apparatus
by Wei Song
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26 Dec 2020 at 10:38am
Preparation of SEM hydrogel samples using a high pressure water freeze fracture method
by Hirofumi Satani
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26 Dec 2020 at 10:35am
Pressure tolerance of brine shrimp (Artemia)
by Ryo Kitahara
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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
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12 Nov 2020 at 7:18am