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.

The global human impact on biodiversity

by François Keck

Nature, Published online: 26 March 2025; doi:10.1038/s41586-025-08752-2

26 Mar 2025 at 12:00am

Publisher Correction: High-pressure pump–probe experiments reveal the mechanism of excited-state proton-coupled electron transfer and a shift from stepwise to concerted pathways

by Daniel Langford

Nature Chemistry, Published online: 28 March 2025; doi:10.1038/s41557-025-01812-0

28 Mar 2025 at 12:00am

Bringing pressure-induced superconductivity back to ambient pressure

by Yuhang DengM. Brian MapleaDepartment of Physics, University of California, San Diego, CA 92093

17 Mar 2025 at 8:00am

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Shear and Bulk Viscosities of Water up to 1.6 GPa and Anomaly in the Structural Relaxation Time

by Jan Eichler, Johannes Stefanski, José Martin Roca, Isabelle Daniel, Bruno Issenmann, Chantal Valeriani, and Frédéric Caupin

Deep in Earth’s crust, pressure exceeds 1000 times the atmospheric pressure. Water still flows under these conditions, but experiences dramatic changes in structure and fluidity. Using combined dynamic and inelastic light scattering techniques, we simultaneously measure the shear and bulk viscositie…

1 Apr 2025 at 12:00pm

Cooperation between Electron-Phonon Coupling and Electronic Interaction in Bilayer Nickelates ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$

by Jun Zhan, Yuhao Gu, Xianxin Wu, and Jiangping Hu

The recent observation of high-${T}_{c}$ superconductivity in the bilayer nickelate ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ under pressure has garnered significant interest. While researches have predominantly focused on the role of electron-electron interactions in the superconducting …

31 Mar 2025 at 12:00pm

Giant Negative Linear Compressibility in Orthorhombic Copper Cyanide

by Swayam Kesari, Alka B. Garg, Nilesh P. Salke, and Rekha Rao

Most reported negative linear compressibility (NLC) materials exhibit either a small NLC over a large pressure range or a high NLC over a very small pressure range. Here, we report the remarkable discovery of giant NLC in the low-temperature form of CuCN (LT-CuCN) over an unusually large pressure ra…

26 Mar 2025 at 11:00am

Electronic Structure of the Alternating Monolayer-Trilayer Phase of ${\mathrm{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7}$

by Sebastien Abadi, Ke-Jun Xu, Eder G. Lomeli, Pascal Puphal, Masahiko Isobe, Yong Zhong, Alexei V. Fedorov, Sung-Kwan Mo, Makoto Hashimoto, Dong-Hui Lu, Brian Moritz, Bernhard Keimer, Thomas P. Devereaux, Matthias Hepting, and Zhi-Xun Shen

Recent studies of ${\mathrm{La}}_{3}{\text{Ni}}_{2}{\mathrm{O}}_{7}$ have identified a bilayer (2222) structure and an unexpected alternating monolayer-trilayer (1313) structure, both of which feature signatures of superconductivity near 80 K under high pressures. Using angle-resolved photoemission …

25 Mar 2025 at 11:00am

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-tuning the spatial extension of polarons and charge mobilities in polar insulators

by Pravin Karna and Ashutosh Giri

Originating from the coupling of excess charge with the ionic vibrations, polaron formation is a pervasive phenomenon that has been observed in different types of materials. Depending on their spatial extensions, these quasiparticles have conventionally been categorized into small or large polarons …

31 Mar 2025 at 12:00pm

Chemical pressure tuning of multipolar and magnetic orders in $\mathrm{B}{\mathrm{a}}_{2}(\mathrm{C}{\mathrm{d}}_{1−x}\mathrm{C}{\mathrm{a}}_{x})\mathrm{Re}{\mathrm{O}}_{6}$ double perovskites

by Koki Shibuya, Daigorou Hirai, and Koshi Takenaka

Double perovskite compounds containing $5d$ transition metal elements have been extensively studied as platforms for multipolar order phenomena stemming from spin-orbit-entangled $5d$ electrons. In this study, we examine the interplay between crystal structure, multipolar order, and magnetic order i…

10 Mar 2025 at 11:00am

Removal of excess iron by annealing processes and emergence of bulk superconductivity in sulfur-substituted FeTe

by Ryosuke Kurihara, Ryusuke Kogure, Tomotaka Ota, Yuto Kinoshita, Satoshi Hakamada, Masashi Tokunaga, and Hiroshi Yaguchi

There are several strategies to discover new superconductors. Growing new materials and applying high pressures have been the classic ways since superconductivity was found. Also, chemical processing, such as annealing, is another way to induce superconductivity in a nonsuperconducting material. Her…

5 Mar 2025 at 11:00am

Pressure-driven solid–solid phase transformations of isotropic particles across diverse crystal structure types

by Hongjin Du, Hillary Pan, and Julia Dshemuchadse

Pressure-induced phase transformations are widely observed in crystalline materials, attracting interest across diverse fields from superconductors to pharmaceuticals. However, studying the mechanisms of these transformations in situ, with sufficient spatial and temporal resolution, remains a challe…

4 Mar 2025 at 11:00am

Pressure-induced topological changes in the Fermi surface of a two-dimensional molecular conductor

by T. Kobayashi, K. Yoshimi, H. Ma, S. Sekine, H. Taniguchi, N. Matsunaga, A. Kawamoto, and Y. Uwatoko

We demonstrated x-ray structural analysis of the pressure-induced superconductor ${β}^{′}\text{−}{\mathrm{ET}}_{2}{\mathrm{ICl}}_{2}$ under extremely high pressure conditions, where ET denotes bis(ethylenedithio)tetrathiafulvalene. This material has been known as the highest transition temperature (…

7 Feb 2025 at 11:00am

Measuring the electrical resistivity of vanadium across the shock-induced phase transformation

by Yang Wang, Jun Li, Junjie Gao, Yifeng Zhang, Wenhao Song, Bo Gan, and Youjun Zhang

Vanadium undergoes a solid-solid phase transformation from a body-centered cubic (bcc) to a rhombohedral (rh) structure under high pressure, significantly affecting its physical and mechanical properties, including strength and transport properties. In this paper, we investigated the electrical resi…

1 Apr 2025 at 12:00pm

Crystal structures of ${\mathrm{ReO}}_{3}$ under hydrostatic pressure: A combined neutron, x-ray, Raman, and first-principles calculation study

by I. Efthimiopoulos, S. Klotz, K. Kunc, B. Baptiste, P. Chauvigne, and T. Hattori

We present a comprehensive study of the high-pressure behavior of ${\mathrm{ReO}}_{3}$ using x-ray and neutron diffraction, Raman scattering, and first-principles calculations. We show that the ambient pressure $Pm\overline{3}m$ structure converts at 0.7 GPa in a continuous phase transition directly…

1 Apr 2025 at 12:00pm

Chemical pressure effect on the magnetic properties of the $S=\frac{1}{2}$ structural screw chain antiferromagnets $A{\mathrm{Co}}_{2}({\mathrm{Te}}_{3}{\mathrm{O}}_{8})({\mathrm{SO}}_{4})$ $(A=\mathrm{Hg},\mathrm{Cd})$

by M. Y. Cui, Z. Y. Zhao, Z. Y. Wu, J. F. Wang, and Z. Z. He

Chemical substitution is an effective route to manipulate the magnetic exchange couplings and modify the magnetic properties. However, replacement between ${\mathrm{Cd}}^{2+}$ and ${\mathrm{Hg}}^{2+}$ cations, both belonging to IIB group in the periodic table but having quite close ionic radii, is r…

1 Apr 2025 at 12:00pm

Magnetoferroelectric phase transition induced by latent spin-lattice coupling in the geometrically frustrated magnet ${\mathrm{CuFe}}_{0.95}{\mathrm{Al}}_{0.05}{\mathrm{O}}_{2}$

by H. Tamatsukuri, T. Uchihara, S. Mitsuda, Y. Ishii, H. Nakao, K. Takehana, and Y. Imanaka

In multiferroic CuFe0.95Al0.05O2, applying uniaxial pressure generates a novel magnetoferroelectric phase. This study reveals that the magnetic structure of this phase is of the collinear sinusoidal type, which itself does not break the inversion symmetry in this system. Nevertheless, the sinusoidal magnetic structure likely contributes to the emergence of ferroelectric polarization in this phase through spin-lattice coupling, requiring a mechanism for a spin-associated ferroelectricity.

1 Apr 2025 at 12:00pm

Pressure- and temperature-induced transformation processes in ${\mathrm{PbTiO}}_{3}\text{−}{\mathrm{Bi}Me\mathrm{O}}_{3}$ ferroelectrics

by Irina Margaritescu, Zenghui Liu, Thomas Malcherek, Carsten Paulmann, Zuo-Guang Ye, and Boriana Mihailova

The structural response to high pressures as well as to high temperatures of $(1\text{−}x){\mathrm{PbTiO}}_{3}\text{−}x\mathrm{Bi}({\mathrm{Zn}}_{0.5}{\mathrm{Ti}}_{0.5}){\mathrm{O}}_{3}$ with $x=0.08$, $(1\text{−}x){\mathrm{PbTiO}}_{3}\text{−}x\mathrm{Bi}({\mathrm{Mg}}_{0.5}{\mathrm{Ti}}_{0.5}){\ma…

1 Apr 2025 at 12:00pm

Cascade of pressure-induced competing charge density waves in the kagome metal FeGe

by A. Korshunov, A. Kar, C.-Y. Lim, D. Subires, J. Deng, Y. Jiang, H. Hu, D. Călugăru, C. Yi, S. Roychowdhury, C. Shekhar, G. Garbarino, P. Törmä, C. A. Fuller, C. Felser, B. Andrei Bernevig, and S. Blanco-Canosa

Electronic ordering is prevalent in correlated systems, which commonly exhibit competing interactions. Here, we use x-ray diffraction to demonstrate a cascade of pressure-induced order-disorder transformations, with propagation vectors ${\mathbf{q}}_{\mathrm{CDW}}=(\frac{1}{2}0\frac{1}{2}), {\mathbf…

1 Apr 2025 at 12:00pm

Biermann battery effect in laser-excited metals

by Ivan Oladyshkin

Interaction of femtosecond optical pulses with solids is accompanied by inhomogeneous electron heating and interband transitions. In the general case it should lead to the excitation of bulk eddy currents due to the misalignment between the gradients of free electrons’ pressure and density, similarl…

1 Apr 2025 at 12:00pm

Near room-temperature ferromagnetism from double exchange in the van der Waals material ${\mathrm{CrGeTe}}_{3}$: Evidence from optical conductivity under pressure

by Jihaan Ebad-Allah, Daniel Guterding, Meera Varma, Mangesh Diware, Shraddha Ganorkar, Harald O. Jeschke, and Christine A. Kuntscher

The van der Waals material CrGeTe3 is a ferromagnetic charge-transfer insulator at ambient pressure. When compressed, the material transforms into a semimetal with near room temperature ferromagnetism. Here, the authors present temperature- and pressure-dependent measurements of its optical conductivity, combined with density functional theory and dynamical mean-field theory calculations. A novel approach to analyzing the experimental data reveals that the pressure-induced insulator-to-metal transition alters the mechanism of ferromagnetism in CrGeTe3 from superexchange to double exchange.

1 Apr 2025 at 12:00pm

Low fractional volume superconductivity in single crystals of $\mathrm{P}{\mathrm{r}}_{4}\mathrm{N}{\mathrm{i}}_{3}{\mathrm{O}}_{10}$ under pressure

by Xinglong Chen, E. H. T. Poldi, Shuyuan Huyan, R. Chapai, H. Zheng, S. L. Bud'ko, U. Welp, P. C. Canfield, Russell J. Hemley, J. F. Mitchell, and D. Phelan

Magnetotransport measurements of $\mathrm{P}{\mathrm{r}}_{4}\mathrm{N}{\mathrm{i}}_{3}{\mathrm{O}}_{10}$ single crystals performed under externally applied pressures up to 73 GPa in diamond anvil cells with either KBr or Nujol oil as pressure media yield signatures of superconductivity with a maximu…

31 Mar 2025 at 12:00pm

Structural and magnetic properties of $\mathrm{CoTeMo}{\mathrm{O}}_{6}$

by Yu Li, Jared Coles, Xin Gui, Hyowon Park, Yan Wu, Xinglong Chen, Jing-han Chen, Xiaoping Wang, Huibo Cao, Shane Stadler, Omar Chmaissem, David P. Young, Stephan Rosenkranz, and John F. DiTusa

The coexistence of helical structural motifs with 21 screw axes and orthorhombic unit cell in CoTeMoO6 allows for subtle tunability under external uniaxial pressure, significantly affecting its magnetic and optical properties. The study here uncovers the presence of structural and magnetic domains, along with their intrinsic anisotropy. These findings highlight a complex interplay among structural, magnetic, and optical degrees of freedom, suggesting potential ferroic behavior.

27 Mar 2025 at 11:00am

Enhancement of superconductivity in thin films of Sn under high pressure

by Misaki Sasaki, Masahiro Ohkuma, Ryo Matsumoto, Toru Shinmei, Tetsuo Irifune, Yoshihiko Takano, and Katsuya Shimizu

We investigated the pressure effects of superconductivity on thin films of Sn. The elemental superconductor Sn with a body-centered-tetragonal structure, $β$-Sn, exhibits superconductivity below the superconducting transition temperature (${T}_{\mathrm{c}}=3.72$ K) at ambient pressure. ${T}_{\mathrm…

27 Mar 2025 at 11:00am

Pressure-induced bonding diversity, electronic topology, and superconducting electrides in Ca-Ge systems

by Chi Ding, Zhongwei Zhang, Qing Lu, Yijie Zhu, Zhixin Liang, Junjie Wang, and Jian Sun

Group IV elements exhibit diverse bonding and crystalline structures, including carbon-based configurations such as graphene and diamond, and silicon-based porous structures. This diversity gives rise to intriguing physical phenomena and applications, such as magic-angle superconductivity and superh…

25 Mar 2025 at 11:00am

Electronic structure of Ruddlesden-Popper nickelates: Strain to mimic the effects of pressure

by Yi-Feng Zhao and Antia S. Botana

Signatures of superconductivity under pressure have recently been reported in the bilayer ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ and trilayer ${\mathrm{La}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{10}$ Ruddlesden-Popper (RP) nickelates with the general chemical formula ${\mathrm{La}}_{n+1}{\…

25 Mar 2025 at 11:00am

In situ electrical conductivity measurement of saturated rocks at shallow crustal temperatures and pressures in an autoclave

by Chaoyi Xiao Shuangming Shan Heping Li Sen Lin Shengbin Li a Key Laboratory of High-Temperature and High-Pressure Study of the Earth’s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, People’s Republic of Chinab University of Chinese Academy of Sciences, Beijing, People’s Republic of China

24 Dec 2024 at 7:38am

Temperature gradients in high pressure multi-anvil cell

by Takuya Moriguti Akira Yoneda Eiji Ito a Institute for Planetary Materials, Okayama University, Misasa, Tottori, Japanb Department of Earth and Space Science, Osaka University, Toyonaka, Osaka, Japan

19 Dec 2024 at 1:29pm

Pressure-sensitive germanate glass-Li2GeO3, a multifunctional energy material: a theoretical study

by R. Zosiamliana L. Celestine Lalhriat Zuala B. Chettri Zodin Mawia G. Abdurakhmanov A. Laref Shalika R. Bhandari D. P. Rai a Physical Sciences Research Center (PSRC), Department of Physics, Pachhunga University College, Mizoram University, Aizawl, Indiab Department of Physics, Mizoram University, Aizawl, Indiac Department of Physics, North-Eastern Hill University, Shillong, Indiad National University of Uzbekistan, Tashkent, Uzbekistane Department of Physics and Astronomy, College of Science, King Saud University, Riyadh, Saudi Arabiaf Department of Physics, Bhairahawa Multiple Campus, Tribhuvan University, Rupandehi, Nepal

25 Dec 2024 at 7:29am

High pressure behavior of incommensurately modulated nyerereite structure

by N. Bogdanov S. Rashchenko P. Gavryushkin V. Thomas D. Fursenko Sobolev Institute of Geology and Mineralogy SB RAS, Novosibirsk, Russia

27 Dec 2024 at 8:15am

Crystalline state in a pressure region of proceeding amorphization of SnI4

by Kazuhiro Fuchizaki Hiroki Naruta Fumiya Sato Tomohiro Ohuchi Akio Suzuki a Department of Physics, Ehime University, Matsuyama, Japanb Graduate School of Science and Engineering, Ehime University, Matsuyama, Japanc Geodynamics Research Center, Ehime University, Matsuyama, Japand Department of Earth Science, Tohoku University, Sendai, Japan

13 Jan 2025 at 12:09pm

High pressure Raman spectroscopy of boron-rich boron carbides up to 50 GPa

by Raimundas Sereika Seth Iwan Paul A. Baker Yogesh K. Vohra Department of Physics, University of Alabama at Birmingham, Birmingham, AL, USA

6 Jan 2025 at 8:55am

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

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

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