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.

Survey of US postdocs finds threefold increase in job losses

by Laurie Udesky

Nature, Published online: 10 July 2025; doi:10.1038/d41586-025-02140-6

10 Jul 2025 at 12:00am

‘It’s a nightmare.’ U.S. funding cuts threaten academic science jobs at all levels

8 Jul 2025 at 12:55am

Pressure-driven electronegativity inversion in alkali liquids

by Chenxu HanHongxiang ZongXiangdong DingJun SunGraeme J. AcklandaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, ChinabCentre for Science at Extreme Conditions, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom

24 Jun 2025 at 9:00am

Roughness-dependent scaling of the contact area and separation gap with pressure for glassy polymers

by Utkarsh PatilShubhendu KumarStephen MerrimanAli DhinojwalaaSchool of Polymer Science and Polymer Engineering, University of Akron, Akron, OH 44325

24 Jun 2025 at 9:00am

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Imaging-Based Quantum Optomechanics

by C. M. Pluchar, W. He, J. Manley, N. Deshler, S. Guha, and D. J. Wilson

In active imaging protocols, information about an object is encoded into the spatial mode of a scattered photon. Recently the quantum limits of active imaging have been explored with levitated nanoparticles, which experience a multimode radiation pressure backaction (the photon recoil force) due to …

8 Jul 2025 at 12:00pm

Quark Matter at Four Loops: Hardships and How to Overcome Them

by Aapeli Kärkkäinen, Pablo Navarrete, Mika Nurmela, Risto Paatelainen, Kaapo Seppänen, and Aleksi Vuorinen

A new theoretical framework simplifies the four-loop Feynman diagrams for dense QCD to few infrared-finite integrals, which brings the higher-order calculation of the pressure inside cold and dense quark matter within reach.

7 Jul 2025 at 12:00pm

Near-Infrared Spectroscopic Sensing of Hydrogen Order in Ice XIII

by Christina M. Tonauer, Eva-Maria Köck, Raphael Henn, Christoph Kappacher, Christian W. Huck, and Thomas Loerting

Infrared spectroscopy performed on high-pressure ice phases demonstrates a possible technique for studying ice on other planets or moons.

2 Jul 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

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

Hydrogen-rich hydrate at high pressures up to 104 GPa

by Alexander F. Goncharov, Elena Bykova, Iskander Batyrev, Maxim Bykov, Eric Edmund, Amol Karandikar, Mahmood Mohammad, Stella Chariton, Vitali Prakapenka, Konstantin Glazyrin, Mohamed Mezouar, Gaston Garbarino, and Jonathan Wright

Gas hydrates are considered fundamental building blocks of giant icy planets like Neptune and similar exoplanets. The existence of these materials in the interiors of giant icy planets, which are subject to high pressures and temperatures, depends on their stability relative to their constituent com…

1 Jul 2025 at 12:00pm

Probing the skyrmion phase of MnSi through the field-exponent of the isothermal entropy change

by Tapas Samanta, Chris Taake, and Luana Caron

A detailed study of the field-induced entropy change evolution under hydrostatic pressure ($p$) of the well-known skyrmion-hosting MnSi system was carried with the goal of assessing its magnetocaloric properties and identifying the skyrmion phase. The pressure-induced modification of the first-order…

26 Jun 2025 at 12:00pm

Phase stability of materials in sodium-rich silicates at high pressure

by Haoyu Wang, Wenwen Cui, Jian Hao, Jingming Shi, and Yinwei Li

Sodium (Na), silicon (Si), and oxygen (O) are main abundant elements to form the minerals inside the Earth's interior. Here, combining first-principles calculations and crystal structural prediction methods, we propose the formation of a distinct stoichiometry, ${\mathrm{Na}}_{6}{\mathrm{SiO}}_{5}$,…

6 Jun 2025 at 12:00pm

Fully thermal meta-GGA exchange correlation free-energy density functional

by Katerina P. Hilleke, Valentin V. Karasiev, S. B. Trickey, R. M. N. Goshadze, and S. X. Hu

Warm dense matter (WDM) is the materials regime that bridges condensed matter and plasmas that occurs in giant-planet centers and the state trajectory of inertial confinement fusion experiments. Predictive density functional theory simulations of WDM must use an explicitly temperature-dependent free-energy exchange-correlation functional. Incorporating thermal effects at the meta-GGA level of refinement, the newly developed fully thermal fTSCAN functional provides high accuracy across the entire temperature and pressure range from ambient to extreme conditions. Tests on model systems highlight the contributions of thermal and density inhomogeneity effects, while molecular dynamics simulations demonstrate accuracy for materials ranging from water under ambient conditions to dense hydrogen at a wide range of temperatures.

27 May 2025 at 12:00pm

Band structure and pairing nature of ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ thin film at ambient pressure

by Zhi-Yan Shao, Yu-Bo Liu, Min Liu, and Fan Yang

Recently, evidence of superconductivity (SC) with onset ${T}_{c}$ above the McMillan limit has been detected in the ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ ultrathin film grown on the ${\mathrm{LaSrAlO}}_{4}$ substrate at ambient pressure. This progress opens another era in the field of…

11 Jul 2025 at 12:00pm

Pressure-induced orbital reordering in ${\mathrm{Na}}_{2}{\mathrm{CuF}}_{4}$

by Craig I. Hiley, Catriona A. Crawford, Craig L. Bull, Nicholas P. Funnell, Urmimala Dey, Nicholas C. Bristowe, Richard I. Walton, and Mark S. Senn

The high-pressure behavior of $\mathrm{N}{\mathrm{a}}_{2}\mathrm{Cu}{\mathrm{F}}_{4}$ is explored by powder neutron diffraction and density functional theory (DFT) calculations. A first-order phase transition is observed to take place between 2.4 and 2.9 GPa, involving a reorientation of the Jahn-Te…

10 Jul 2025 at 12:00pm

Origin of insulating-like behavior of ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+x}$ under pressure: A first-principles study

by Xin Du, Jian-Feng Zhang, Zhong-Yi Lu, and Kai Liu

Recent experimental study on ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+x}$ superconductors has revealed an unexpected quantum phase transition from superconducting state to insulatinglike state under pressure [Zhou et al., Nat. Phys. 18, 406 (2022)]. To better understand …

9 Jul 2025 at 12:00pm

Machine learning enhanced quantum molecular dynamics assessment of the phase diagram of uranium

by P. V. Chirkov, G. S. Eltsov, R. M. Kichigin, A. A. Mirzoev, A. V. Karavaev, and V. V. Dremov

Two approaches to the calculation of phase diagrams for materials under high pressures and temperatures with the use of ab initio molecular dynamics are discussed. The first is based on calculations of vibrational free energies of crystal phases with the temperature-dependent effective potential, an…

8 Jul 2025 at 12:00pm

Pressure-induced superconducting phases and electronic reconstruction in layered RbMgBi

by Xintian Chen, Wenxuan Chen, Yuxin Yang, Yazhou Zhou, Cheng Huang, Pengyu Wang, Yangfan Gao, Defang Duan, Shu Cai, Jinyu Zhao, Jinyu Han, Ke Yang, Aiguo Li, Sheng Jiang, Qi Wu, Tianping Ying, Jing Guo, and Liling Sun

We report the discovery of pressure-induced superconductivity transitions in RbMgBi, a nonmetallic layered compound under ambient conditions. Upon compression, RbMgBi first undergoes an insulator-to-metal transition at $∼4.5\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$, coinciding with the emergence of …

7 Jul 2025 at 12:00pm

Disruption of Lipomyces starkeyi cells grown in hydrolyzed cheese-whey by high pressure homogenization for enhancing lipid extraction

by Ayşe Alara Batıgün Hami Alpas Deniz Cekmecelioglu Department of Food Engineering, Middle East Technical University, Ankara, Turkey

13 Mar 2025 at 11:57am

A new pressure medium, Daphne 7676, with solidification pressure of 5 GPa at 300 K and low melting point of around 110 K at ambient pressure

by K. Murata K. Goto S. Klotz D. Bhoi K. Béneut Y. Uwatoko H. Yoshino S. Aoki a Osaka Metropolitan University, Osaka, Japanb Idemitsu Kosan Co. Ltd, Tokyo, Japanc IMPMC, CNRS UMR 7590, Sorbonne Université, Paris, Franced ISSP, University of Tokyo, Tokyo, Japane Univ. of Electro-Communications, Chofu, Japanf Sorbonne Université, IMPMC, Paris, Franceg Neutron Sci. &Tech. Center (CROSS), Tokai, Ibaraki, Japan

6 Jun 2025 at 8:33am

Electrical properties of GdF3 under high pressure

by Tingjing Hu Kenan Xu Yuanlin Liu Liyun Yan Jingshu Wang Junkai Zhang Xuefei Li Xiaoyan Cui a School of Physics and Electrical Engineering, Jiaying University, Meizhou, People’s Republic of Chinab Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, National Demonstration Center for Experimental Physics Education, Jilin Normal University, Siping, People’s Republic of China

10 Jun 2025 at 2:05pm

Accurate, reproducible, and robust detection of phase transformations in alloys subjected to high isostatic pressure and cooling rates

by Stefan Müller Santiago Benito Leonhard Gertlowski Oliver Schenk Christoph Broeckmann Sebastian Weber a Ruhr University Bochum, Chair of Materials Technology, Bochum, Germanyb RWTH Aachen, Institute of Applied Powder Metallurgy and Ceramics, Aachen, Germany

13 Jun 2025 at 1:52pm

Irreversible changes in amorphous C₃N₄ under pressure: loss of chemical order and graphite-like character

by Murat Durandurdu Department of Materials Science and Nanotechnology Engineering, Abdullah Gül University, Kayseri, Türkiye

21 Apr 2025 at 5:23am

The magnetism and elasticity of ϵ-FeOOH across the pressure-induced electronic spin transition

by Osamu Ikeda Tatsuya Sakamaki Takaya Mitsui Kosuke Fujiwara Hiroshi Uchiyama Hiroshi Fukui Daisuke Ishikawa Alfred Q.R. Baron Akio Suzuki a Department of Earth Science, Graduate School of Science, Tohoku University, Sendai, Japanb Kansai Institute for Photon Science, National Institute for Quantum Science and Technology, Sayo, Japanc Japan Synchrotron Radiation Research Institute, Sayo, Japand Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Japan

19 Feb 2025 at 7:57am

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

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