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 58th European High Pressure Research Group Meeting on High Pressure Science and Technology (EHPRG-2020) will be held in Tenerife, Spain, from 6th to 11th September 2020. The 58th EHPRG Meeting will be chaired by Alfonso Muñoz Gonzalez (Universidad de La Laguna, Tenerife, Spain).
For more information, please visit the official webpage of the 58th EHPRG Meeting.

High-pressure in the headlines

 

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

    Photon-pressure strong coupling between two superconducting circuits
    by D. Bothner

    Nature Physics, Published online: 10 August 2020; doi:10.1038/s41567-020-0987-5

    Analogous to the radiation-pressure coupling known in optomechanics, photon-pressure interaction between superconducting circuits can reach the strong coupling regime, which allows flexible control of the electromagnetic resonator’s quantum state.
    10 Aug 2020 at 12:00am
    Studies in humanized mice and convalescent humans yield a SARS-CoV-2 antibody cocktail
    by Hansen, J., Baum, A., Pascal, K. E., Russo, V., Giordano, S., Wloga, E., Fulton, B. O., Yan, Y., Koon, K., Patel, K., Chung, K. M., Hermann, A., Ullman, E., Cruz, J., Rafique, A., Huang, T., Fairhurst, J., Libertiny, C., Malbec, M., Lee, W.-y., Welsh, R., Farr, G., Pennington, S., Deshpande, D., Cheng, J., Watty, A., Bouffard, P., Babb, R., Levenkova, N., Chen, C., Zhang, B., Romero Hernandez, A., Saotome, K., Zhou, Y., Franklin, M., Sivapalasingam, S., Lye, D. C., Weston, S., Logue, J., Haupt, R., Frieman, M., Chen, G., Olson, W., Murphy, A. J., Stahl, N., Yancopoulos, G. D., Kyratsous, C. A.

    Neutralizing antibodies have become an important tool in treating infectious diseases. Recently, two separate approaches yielded successful antibody treatments for Ebola – one from genetically-humanized mice, and the other from a human survivor. Here, we describe parallel efforts using both humanized mice and convalescent patients to generate antibodies against the SARS-CoV-2 spike protein, yielding a large collection of fully-human antibodies that were characterized for binding, neutralization and three dimensional structure. Based on these criteria, we selected pairs of highly-potent individual antibodies that simultaneously bind the receptor-binding domain of the spike protein, providing ideal partners for a therapeutic antibody cocktail that aims to decrease the potential for virus escape mutants that might arise in response to selective pressure from a single antibody treatment.


    15 Jun 2020 at 7:51pm
    High-pressure elastic properties of dolomite melt supporting carbonate-induced melting in deep upper mantle [Earth, Atmospheric, and Planetary Sciences]
    by Man Xu, Zhicheng Jing, Suraj K. Bajgain, Mainak Mookherjee, James A. Van Orman, Tony Yu, Yanbin Wang
    Deeply subducted carbonates likely cause low-degree melting of the upper mantle and thus play an important role in the deep carbon cycle. However, direct seismic detection of carbonate-induced partial melts in the Earth’s interior is hindered by our poor knowledge on the elastic properties of carbonate melts. Here we report...
    4 Aug 2020 at 6:02pm
    Many-body reactive force field development for carbon condensation in C/O systems under extreme conditions
    by Rebecca K. Lindsey
    The Journal of Chemical Physics, Volume 153, Issue 5, August 2020.
    We describe the development of a reactive force field for C/O systems under extreme temperatures and pressures, based on the many-body Chebyshev Interaction Model for Efficient Simulation (ChIMES). The resulting model, which targets carbon condensation under thermodynamic conditions of 6500 K and 2.5 g cm−3, affords a balance between model accuracy, complexity, and training set generation expense. We show that the model recovers much of the accuracy of density functional theory for the prediction of structure, dynamics, and chemistry when applied to dissociative condensed phase systems at 1:1 and 1:2 C:O ratios, as well as molten carbon. Our C/O modeling approach exhibits a 104 increase in efficiency for the same system size (i.e., 128 atoms) and a linear system size scalability over standard quantum molecular dynamics methods, allowing the simulation of significantly larger systems than previously possible. We find that the model captures the condensed-phase reaction-coupled formation of carbon clusters implied by recent experiments, and that this process is susceptible to strong finite size effects. Overall, we find the present ChIMES model to be well suited for studying chemical processes and cluster formation at pressures and temperatures typical of shock waves. We expect that the present C/O modeling paradigm can serve as a template for the development of a broader high pressure–high temperature force-field for condensed phase chemistry in organic materials.
    3 Aug 2020 at 7:59am
    Raman studies of hydrogen trapped in As4O6·2H2 at high pressure and low temperature
    by Piotr A. Guńka
    The Journal of Chemical Physics, Volume 153, Issue 5, August 2020.
    Raman spectroscopic measurements of the arsenolite–hydrogen inclusion compound As4O6·2H2 were performed in diamond anvil cells at high pressure and variable temperature down to 80 K. The experimental results were complemented by ab initio molecular dynamics simulations and phonon calculations. Observation of three hydrogen vibrons in As4O6·2H2 is reported in the entire temperature and pressure range studied (up to 24 GPa). While the experiments performed with protium and deuterium at variable temperatures allowed for the assignment of two vibrons as Q1(1) and Q1(0) transitions of ortho and para spin isomers of hydrogen trapped in the inclusion compound, the origin of the third vibron could not be unequivocally established. Low-temperature spectra revealed that the lowest-frequency vibron is actually composed of two overlapping bands of Ag and T2g symmetries dominated by H2 stretching modes as predicted by our previous density functional theory calculations. We observed low-frequency modes of As4O6·2H2 vibrations dominated by H2 “librations,” which were missed in a previous study. A low-temperature fine structure was observed for the J = 0 → 2 and J = 1 → 3 manifolds of hydrogen trapped in As4O6·2H2, indicating the lifting of degeneracy due to an anisotropic environment. A non-spherical distribution was captured by molecular dynamics simulations, which revealed that the trajectory of H2 molecules is skewed along the crystallographic ⟨111⟩ direction. Last but not least, low-temperature synchrotron powder x-ray diffraction measurements on As4O6·2H2 revealed that the bulk structure of the compound is preserved down to 5 K at 1.6 GPa.
    3 Aug 2020 at 4:18am
    Suppression of Orientational Correlations in the Viscous-Liquid State of Hyperquenched Pressure-Densified Glycerol
    by Catalin Gainaru, Helge Nelson, Jan Huebinger, Markus Grabenbauer, and Roland Böhmer
    Author(s): Catalin Gainaru, Helge Nelson, Jan Huebinger, Markus Grabenbauer, and Roland Böhmer

    Glycerol pressurized to 2 kbar and hyperquenched from the bulk liquid at rates of about $−10\text{ }000\text{ }\text{ }\mathrm{K}/\mathrm{s}$, has been frozen to an extreme out-of-equilibrium state. As compared to conventionally cooled melts, the resulting material exhibits lower orientational corre...


    [Phys. Rev. Lett. 125, 065503] Published Thu Aug 06, 2020
    6 Aug 2020 at 12:00pm
    To Understand Film Dynamics Look to the Bulk
    by Ronald P. White and Jane E. G. Lipson
    Author(s): Ronald P. White and Jane E. G. Lipson

    We show that shifts in dynamics of confined systems relative to that of the bulk material originate in the properties of bulk alone, and exhibit the same form of behavior as when different bulk isobars are compared. For bulk material, pressure-dependent structural relaxation times follow $τ(T,V)∝\ma...


    [Phys. Rev. Lett. 125, 058002] Published Thu Jul 30, 2020
    30 Jul 2020 at 12:00pm
    Plastic and Superionic Helium Ammonia Compounds under High Pressure and High Temperature
    by Cong Liu, Hao Gao, Andreas Hermann, Yong Wang, Maosheng Miao, Chris J. Pickard, Richard J. Needs, Hui-Tian Wang, Dingyu Xing, and Jian Sun
    Author(s): Cong Liu, Hao Gao, Andreas Hermann, Yong Wang, Maosheng Miao, Chris J. Pickard, Richard J. Needs, Hui-Tian Wang, Dingyu Xing, and Jian Sun

    Stable compounds made from helium and ammonia are predicted to form at the extreme pressures found inside Neptune and Uranus.


    [Phys. Rev. X 10, 021007] Published Thu Apr 09, 2020
    9 Apr 2020 at 12:00pm
    Solids, liquids, and gases under high pressure
    by Ho-Kwang Mao, Xiao-Jia Chen, Yang Ding, Bing Li, and Lin Wang
    Author(s): Ho-Kwang Mao, Xiao-Jia Chen, Yang Ding, Bing Li, and Lin Wang

    The effect of adding high pressure as a control parameter in solids, liquids, and gases expands opportunities to observe unexpected novel phenomena and understand matter in extreme environments. This review on high pressure science highlights subjects ranging from quantum criticality to Earth science. State-of-the-art experimental methods at megabar pressures are also discussed. The proliferation of pressure-induced phases illustrate promising new directions for this field of research.


    [Rev. Mod. Phys. 90, 015007] Published Tue Mar 20, 2018
    20 Mar 2018 at 11:00am
    Colloquium: High pressure and road to room temperature superconductivity
    by Lev P. Gor’kov and Vladimir Z. Kresin
    Author(s): Lev P. Gor’kov and Vladimir Z. Kresin

    Even after three decades of development, high-temperature superconductivity remains one of the most challenging theoretical and experimental areas in condensed matter physics. In this Colloquium some new discoveries in this area are reviewed and possible routes toward much higher transition temperatures are analyzed.


    [Rev. Mod. Phys. 90, 011001] Published Tue Jan 09, 2018
    9 Jan 2018 at 11:00am
    Tuning the structural and antiferromagnetic phase transitions in ${\mathrm{UCr}}_{2}{\mathrm{Si}}_{2}$: Hydrostatic pressure and chemical substitution
    by Y. Lai, K. Wei, G. Chappell, J. Diaz, T. Siegrist, P. J. W. Moll, D. Graf, and R. E. Baumbach
    Author(s): Y. Lai, K. Wei, G. Chappell, J. Diaz, T. Siegrist, P. J. W. Moll, D. Graf, and R. E. Baumbach

    Structural phase transitions in $f$-electron materials have attracted sustained attention both for practical and basic science reasons, including the fact that they offer an environment to directly investigate relationships between structure and the $f$-state. Here we present results for ${\mathrm{U...


    [Phys. Rev. Materials 4, 075003] Published Fri Jul 24, 2020
    24 Jul 2020 at 12:00pm
    First-principles prediction of two-dimensional copper borides
    by Xiao-Ji Weng, Xin-Ling He, Jing-Yu Hou, Chun-Mei Hao, Xiao Dong, Guoying Gao, Yongjun Tian, Bo Xu, and Xiang-Feng Zhou
    Author(s): Xiao-Ji Weng, Xin-Ling He, Jing-Yu Hou, Chun-Mei Hao, Xiao Dong, Guoying Gao, Yongjun Tian, Bo Xu, and Xiang-Feng Zhou

    Ordered borides of group IB and IIB metals (Cu, Ag, Au, Zn, Cd, Hg), as the well-known immiscible materials, are practically unknown due to the small electronegativity difference and large mismatch in their atomic sizes. Nevertheless, such rule may be broken under extreme conditions, i.e., high pressure or low dimensionality. Here two-dimensional (2D) copper borides were predicted from ab initio evolutionary searches, identifying that two structures are metallic whereas another one is strikingly a nodal line semimetal. These results challenge the long lasting puzzle in the immiscible systems and add new members to the 2D materials.


    [Phys. Rev. Materials 4, 074010] Published Thu Jul 23, 2020
    23 Jul 2020 at 12:00pm
    RSAVS superconductors: Materials with a superconducting state that is robust against large volume shrinkage
    by Cheng Huang, Jing Guo, Jianfeng Zhang, Karoline Stolze, Shu Cai, Kai Liu, Hongming Weng, Zhongyi Lu, Qi Wu, Tao Xiang, Robert J. Cava, and Liling Sun
    Author(s): Cheng Huang, Jing Guo, Jianfeng Zhang, Karoline Stolze, Shu Cai, Kai Liu, Hongming Weng, Zhongyi Lu, Qi Wu, Tao Xiang, Robert J. Cava, and Liling Sun

    The transition temperature (${T}_{\mathrm{C}}$) between normal and superconducting states usually exhibits a dramatic increase or decrease with increasing applied pressure. Here we present, in contrast, a type of superconductor that exhibits the exotic feature that ${T}_{\mathrm{C}}$ is robust again...


    [Phys. Rev. Materials 4, 071801(R)] Published Mon Jul 20, 2020
    20 Jul 2020 at 12:00pm
    Hybrid improper ferroelectricity and pressure-induced enhancement of polarization in $\mathrm{B}{\mathrm{a}}_{3}\mathrm{C}{\mathrm{e}}_{2}{\mathrm{O}}_{7}$ predicted by a first-principles calculation
    by Bu Hang Chen, Xiao Qiang Liu, and Xiang Ming Chen
    Author(s): Bu Hang Chen, Xiao Qiang Liu, and Xiang Ming Chen

    Hybrid improper ferroelectricity (HIF) is recognized as a promising way to design room-temperature multiferroic materials with strong magnetoelectric coupling. However, predicting new HIF materials with high ferroelectric polarization remains to be a great challenge. Here, the new compound $\mathrm{...


    [Phys. Rev. Materials 4, 074407] Published Tue Jul 14, 2020
    14 Jul 2020 at 12:00pm
    Role of dislocations in the bcc-hcp transition under high pressure: A first-principles approach in beryllium
    by Vanessa Riffet, Bernard Amadon, Nicolas Bruzy, and Christophe Denoual
    Author(s): Vanessa Riffet, Bernard Amadon, Nicolas Bruzy, and Christophe Denoual

    We study the impact of dislocations on the bcc-to-hcp-to-bcc phase transition cycle using density-functional theory. The transformation is studied under two external constraints: first under pressure, and second under uniaxial shear. In both cases, we find that the elastic strain created by $±\frac{...


    [Phys. Rev. Materials 4, 063609] Published Tue Jun 30, 2020
    30 Jun 2020 at 12:00pm
    From antiferromagnetism to high-${T}_{c}$ weak ferromagnetism manipulated by atomic rearrangement in ${\mathrm{Ba}}_{3}{\mathrm{NiOs}}_{2}{\mathrm{O}}_{9}$
    by Hai L. Feng (冯海), Jie Chen (陈洁), Zhiwei Hu, Xiao Wang, Manfred Reehuis, Peter Adler, Andreas Hoser, Mei-Xia Wu, Stefano Agrestini, Hari Babu Vasili, J. Herrero-Martin, Lucie Nataf, Francois Baudelet, Kai Chen, Yoshitaka Matsushita, Man-Rong Li, Liu Hao Tjeng, Claudia Felser, Martin Jansen, and Kazunari Yamaura
    Author(s): Hai L. Feng (冯海), Jie Chen (陈洁), Zhiwei Hu, Xiao Wang, Manfred Reehuis, Peter Adler, Andreas Hoser, Mei-Xia Wu, Stefano Agrestini, Hari Babu Vasili, J. Herrero-Martin, Lucie Nataf, Francois Baudelet, Kai Chen, Yoshitaka Matsushita, Man-Rong Li, Liu Hao Tjeng, Claudia Felser, Martin Jansen, and Kazunari Yamaura

    Polycrystalline samples of $\mathrm{B}{\mathrm{a}}_{3}\mathrm{NiO}{\mathrm{s}}_{2}{\mathrm{O}}_{9}$ were synthesized at ambient pressure (AP) and high pressure (HP) conditions, respectively. Both samples are electrically semiconducting. The AP $\mathrm{B}{\mathrm{a}}_{3}\mathrm{NiO}{\mathrm{s}}_{2}{...


    [Phys. Rev. Materials 4, 064420] Published Tue Jun 30, 2020
    30 Jun 2020 at 12:00pm
    Domes of ${T}_{c}$ in single-band and multiband superconductors with finite-range attractive interactions
    by Nazim Boudjada, Finn Lasse Buessen, and Arun Paramekanti
    Author(s): Nazim Boudjada, Finn Lasse Buessen, and Arun Paramekanti

    The rise and fall of the superconducting transition temperature ${T}_{c}$ upon tuning carrier density or external parameters, such as pressure or magnetic field, is ubiquitously observed in a wide range of quantum materials. In order to investigate such domes of ${T}_{c}$, we go beyond the prototypi...


    [Phys. Rev. B 102, 054504] Published Thu Aug 06, 2020
    6 Aug 2020 at 12:00pm
    Pressure effect on the electromotive force of the type R thermocouple
    by Yu Nishihara
    Volume 40, Issue 2, June 2020, Page 205-218
    .

    23 Dec 2019 at 12:29pm
    Phase relations in the Fe-P system at high pressures and temperatures from ab initio computations
    by Nursultan E. Sagatov
    Volume 40, Issue 2, June 2020, Page 235-244
    .

    17 Mar 2020 at 5:28am
    TiB2-reinforced B4C composites produced by reaction sintering at high-pressure and high temperature
    by Xiaonan Wang
    Volume 40, Issue 2, June 2020, Page 245-256
    .

    9 Apr 2020 at 8:54am
    TiC-MgO composite: an X-ray transparent and machinable heating element in a multi-anvil high pressure apparatus
    by Fang Xu
    Volume 40, Issue 2, June 2020, Page 257-266
    .

    6 Apr 2020 at 10:44am
    Ab initio investigation of pressure-induced structural transitions and electronic evolution of Th3N4
    by Yue Zhang
    Volume 40, Issue 2, June 2020, Page 267-282
    .

    13 May 2020 at 11:43am
    Changes of microflora in high pressure treated Indian white prawn (Fenneropenaeus indicus)
    by J. Ginson
    Volume 40, Issue 2, June 2020, Page 283-297
    .

    7 Jan 2020 at 7:50am
    X-ray diffraction and Raman spectra of merrillite at high pressures
    by Muhua Jia
    .

    29 Jul 2020 at 10:21am
    Toward an international practical pressure scale: A proposal for an IPPS ruby gauge (IPPS-Ruby2020)
    by Guoyin Shen
    .

    23 Jul 2020 at 3:58am
    Resistively heated, high pressure, membrane and screw driven diamond anvil cell
    by Mario Santoro
    .

    7 Jul 2020 at 1:46pm
    Practical effects of pressure-transmitting media on neutron diffraction experiments using Paris–Edinburgh presses
    by T. Hattori
    .

    25 Jun 2020 at 1:13pm
    Refrigerated shelf-life evaluation of high pressure processed, raw and sous vide cooked lobster
    by Sami Humaid
    .

    16 Jun 2020 at 5:38am
    Development of a high pressure stirring cell up to 2 GPa: a new window for chemical reactions and material synthesis
    by Ying-Jui Hsu
    .

    5 Jun 2020 at 11:40am
    Tantalum doping in HfO2: orthorhombic phase formation at ambient conditions and change in path of pressure-induced structural evolution
    by S. Pathak
    .

    20 May 2020 at 2:29pm