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 62nd EHPRG Meeting will take place in Manchester, UK, at the Lowry, in the period August 31-September 5, 2025.
The conference will be chaired by John Proctor, Salford University, UK.
For more information, please visit the official webpage of EHPRG-62.

Immediate past EHPRG Meetings

The 61st EHPRG Meeting has taken place in Thessaloniki, Greece, at the Porto Palace Hotel, in the period September 1-6, 2024.
The conference has been chaired by John Arvanitidis and Dimitris Christofilos, Aristotle University of Thessaloniki.
For more information, please visit the official webpage of EHPRG-61.

The Joint 28th AIRAPT and 60th EHPRG International Conference on High Pressure Science and Technology (AIRAPT-2023) took place in Edinburgh, UK, at the Edinburgh International Conference Centre (EICC), from July 23-28, 2023.
Immediately prior to AIRAPT/EHPRG, from the 19th to 23rd of July 2023, a Summer School had taken place, also based in Edinburgh, with accommodation provided in University Halls of Residence. The School was aimed at young researchers, and experimentalists wanting a grounding in theory and vice versa.
A photo album is available on the AIRAPT website.
For more information, please visit the official webpage of AIRAPT-23.

High-pressure in the headlines

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

Flexible fibre-shaped fuel cells with gel-mediated internal pressure encapsulation

by Yongjiang Yuan

Nature Materials, Published online: 25 August 2025; doi:10.1038/s41563-025-02319-2

25 Aug 2025 at 12:00am

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Evidence for the Meissner Effect in the Nickelate Superconductor ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7\text{−}δ}$ Single Crystal Using Diamond Quantum Sensors

by Lin Liu, Jianning Guo, Deyuan Hu, Guizhen Yan, Yuzhi Chen, Lunxuan Yu, Meng Wang, Xiao-Di Liu, and Xiaoli Huang

Quantum sensing with nitrogen-vacancy (NV) centers in diamond enables the characterization of magnetic properties in the extreme situation of a tiny sample with defects. Recent studies have reported superconductivity in ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7\text{−}δ}$ under pressure, wi…

25 Aug 2025 at 12:00pm

Incommensurate Antiferromagnetism in ${\mathrm{UTe}}_{2}$ under Pressure

by W. Knafo, T. Thebault, S. Raymond, P. Manuel, D. D. Khalyavin, F. Orlandi, E. Ressouche, K. Beauvois, G. Lapertot, K. Kaneko, D. Aoki, D. Braithwaite, and G. Knebel

Neutron diffraction reveals that superconductivity in UTe2 emerges near an incommensurate antiferromagnetic phase under pressure, pointing to antiferromagnetic—rather than ferromagnetic—correlations as a key driving force.

30 May 2025 at 12:00pm

Colloquium: Room temperature superconductivity: The roles of theory and materials design

by Warren E. Pickett

Superconductivity, discovered in 1911 and first theoretically understood in 1957, remains a fascinating phenomenon for reasons both fundamental and applied. Reliably calculating the critical temperature of a given material, and even more so predicting it, turned out to be a considerable challenge. This Colloquium explains how theoretical developments have led to increasingly reliable predictions that have culminated in the discovery of the hydride materials that display superconductivity under high pressure at temperatures just shy of room temperature.

7 Apr 2023 at 12:00pm

Pressure suppresses the density wave order in kagome metal ${\mathrm{LuNb}}_{6}{\mathrm{Sn}}_{6}$

by William R. Meier, David E. Graf, Brenden R. Ortiz, Shirin Mozaffari, and David Mandrus

The density waves that develop in kagome metals ${\mathrm{ScV}}_{6}{\mathrm{Sn}}_{6}$ and ${\mathrm{LuNb}}_{6}{\mathrm{Sn}}_{6}$ at low temperature appear to arise from underfilled atomic columns within a V-Sn or Nb-Sn scaffolding. Compressing this network with applied pressure in ${\mathrm{ScV}}_{6…

21 Aug 2025 at 12:00pm

Thermal and mechanical influences on shear band formation and suppression in shocked 1,3,5-trinitroperhydro-1,3,5-triazine (RDX)

by Brenden W. Hamilton and Timothy C. Germann

High-pressure shear band formation is a critical phenomenon in energetic materials because of its ability to form hotspots and influence mechanical strength. Shear banding is known to occur in a variety of these materials, but the governing dynamics of the mechanisms are not well defined for molecul…

6 Aug 2025 at 12:00pm

Pressure-induced irreversible volume collapse in a high-entropy alloy

by Raimundas Sereika, Caleb M. Knight, Kallol Chakrabarty, Andrew D. Pope, Dean Smith, and Yogesh K. Vohra

At ambient conditions, the high-entropy alloy superconductor $\mathrm{R}{\mathrm{e}}_{0.6}{(\mathrm{NbTiZrHf})}_{0.4}$ exhibits exceptional mechanical properties among high-entropy alloys, with its hexagonal phase achieving nanoindentation hardness of 18.5 GPa. We report on a unique pressure-induced…

24 Jul 2025 at 12:00pm

Slip-dominated structural transitions

by Kanka Ghosh, Oğuz Umut Salman, Sylvain Queyreau, and Lev Truskinovsky

By introducing a novel method of tracking the history of atomic-scale metric tensors in molecular dynamics, the authors uncover hidden micro-slips during pressure-induced square to hexagonal transition. The purely geometrical tessellation of the configurational space of metric tensors creates a possibility to distinguish between elastic and plastic deformations and reveals previously hidden “micro-slips” under “shuffle”, portraying a central role of lattice invariant shears in this class of phase transformation. The discovered slip-dominated mechanism during the square to hexagonal transition contains some generic elements and is expected to be common for most reconstructive transitions including the iconic BCC-HCP and FCC-HCP transitions.

7 Jul 2025 at 12:00pm

High-pressure reduction of carbon dioxide in reactive liquid mixtures

by D. Durkee, K. P. Hilleke, and S. X. Hu

Density-functional theory based molecular-dynamics simulations were used to investigate high-pressure chemical reactions in liquid mixtures of ${\mathrm{CO}}_{2}$ with several elements (Si, Mn, and Fe) at high temperatures of 2000–3000 K. Our ab initio simulations indicate that these reactant elemen…

28 Aug 2025 at 12:00pm

Pressure evolution of coplanar antiferromagnetism in heavy-fermion ${\mathrm{Ce}}_{2}{\mathrm{CoAl}}_{7}{\mathrm{Ge}}_{4}$

by M. O. Ajeesh, A. O. Scheie, Yu Liu, L. Keller, S. M. Thomas, P. F. S. Rosa, and E. D. Bauer

${\mathrm{Ce}}_{2}M{\mathrm{Al}}_{7}{\mathrm{Ge}}_{4}$ ($M=\text{Co,}\phantom{\rule{4.pt}{0ex}}\text{Ir,}\phantom{\rule{4.pt}{0ex}}\text{Ni}\phantom{\rule{4.pt}{0ex}}\text{or}\phantom{\rule{4.pt}{0ex}}\text{Pd}$) are heavy-fermion materials and host a variety of ground states ranging from magnetism …

28 Aug 2025 at 12:00pm

High-temperature superconductivity in quinary clathrate hydrides under pressure

by Peiyu Zhang, Hongyi Guan, Hefei Li, Xin Zhong, Russell J. Hemley, and Hanyu Liu

The search for high-temperature superconductivity among pressure-stabilized hydrides has received great interest since theory-directed clathrate hydrides, such as ${\mathrm{CaH}}_{6}, {\mathrm{YH}}_{6}, {\mathrm{YH}}_{9}$, and ${\mathrm{LaH}}_{10}$, were synthesized and shown to exhibit a supercondu…

27 Aug 2025 at 12:00pm

One-dimensional linear Nb chains driving superconductivity in the pressure-induced Pnma phase of $\mathrm{Nb}{\mathrm{O}}_{2}$

by Fei Li and Wenjing Li

Superconductivity in transition metal oxides (TMOs) usually favors oxygen-rich compositions, where polyhedral units surround transition metals, minimizing interaction between neighboring atoms. Herein we report a pressure-induced Pnma phase of $\mathrm{Nb}{\mathrm{O}}_{2}$, identified by first-princ…

25 Aug 2025 at 12:00pm

Multishock compression of dense deuterium-helium mixtures with varying helium abundance up to megabar pressures: Assessing the role of the nonideal mixing effect

by Lei Liu, Zhi-Guo Li, Qi-Feng Chen, Yun-Jun Gu, Guo-Jun Li, Zhao-Qi Wang, Yang-shun Lan, Zhi-Jun Shen, and Hua-Zhong Guo

Hydrogen and helium constitute the main components of Jovian planets. Under the warm dense conditions inside gas giants, helium droplets settle deeper into the planet, forming a helium gradient. Consequently, thermodynamic properties, such as the equation of state (EoS) and sound speed, of hydrogen-…

25 Aug 2025 at 12:00pm

Pressure and strain effects on the ab initio $GW$ electronic structure of ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$

by Jean-Baptiste de Vaulx, Quintin N. Meier, Pierre Toulemonde, Andrés Cano, and Valerio Olevano

The bilayer compound La3Ni2O7 under high pressure has long held the superconducting Tc record among the nickelates, triggering a considerable amount of experimental and theoretical work to understand its main electronic properties. This work presents an ab initio analysis of these properties within the G0W0 approximation for different pressures and under epitaxial strain, showing features consistent with ARPES data as well as interesting effects. Among these, a strong renormalization of the rare-earth band and a slight deviation from conventional Fermi-liquid behavior stand out.

25 Aug 2025 at 12:00pm

High-temperature superconductivity in Th-B-H systems via nonclathrate design

by Zengguang Zhou, Wenwen Cui, Shicong Ding, Weishuo Xu, Jian Hao, Jingming Shi, Artur P. Durajski, Hanyu Liu, and Yinwei Li

Ternary hydrides have recently been predicted to exhibit exceptional superconducting properties under high pressure, positioning them as promising candidates for room-temperature superconductivity. In this work, we perform a systematic investigation of the Th-B-H system at 100 and 200 GPa using stat…

22 Aug 2025 at 12:00pm

High pressure–temperature picosecond acoustic measurements on Fe using an internal-resistive-heated diamond anvil cell

by Yoshihiro Nagaya Takashi Yagi Ryoto Ebina Kei Hirose Manabu Kodama Shuichiro Hirai Kenji Ohta a Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Meguro, Japanb National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Ibaraki, Japanc Department of Earth and Planetary Science, The University of Tokyo, Bunkyo, Japand Department of Mechanical Engineering, Tokyo Institute of Technology, Meguro, Japan

28 Jun 2025 at 8:57am

LiPF6 under pressure: a symmetry-mode-based structural analysis

by C. J. Ridley C. L. Bull N.P. Funnell a Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USAb Rutherford Appleton Laboratories, ISIS Neutron and Muon Source, Harwell, Didcot, UKc School of Chemistry, The University of Edinburgh, Edinburgh, UK

6 Jul 2025 at 8:31am

Synergistic effects of elevated hydrostatic pressure, mild heat, malic acid, and citricidalTM against wild-type, rifampicin-resistant, and pressure-stressed Shiga toxin-producing Escherichia coli

by Niraj Ghimire Ranju Kafle Junice Sibley Sandhya Thapa Aliyar Cyrus Fouladkhah a Public Health Microbiology Laboratory, Food Science Program, Tennessee State University, Nashville, TN, USAb Public Health Microbiology FoundationSM, Franklin, TN, USA

14 Jul 2025 at 7:17am

Pressure-induced phase transition in α-Bi₂O₃: evidence from synchrotron X-ray diffraction and Raman spectroscopy

by Zhenwu Zeng Hailian Hong Can Tian Jiayu Wang a Department of Physics, Faculty of Mechanical and Electrical Engineering, Sanming University, Sanming, People’s Republic of Chinab Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi, People’s Republic of Chinac State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, People’s Republic of Chinad School of Physics and Optoelectronic Engineering, Hainan University, Haikou, People’s Republic of China

29 Jul 2025 at 9:29am

Single-crystal X-ray diffraction study of the incommensurately modulated structure of flamite under high pressure

by Mark A. Ignatov Sergey V. Rashchenko Nikita E. Bogdanov Alexandr V. Romanenko Ella V. Sokol Svetlana N. Kokh a Sobolev Institute of Geology and Mineralogy Siberian Branch of Russian Academy of Sciences, Novosibirsk, Russiab Department of Geology and Geophysics, Novosibirsk State University, Novosibirsk, Russia

18 Aug 2025 at 4:27am

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