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.

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