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.

Signatures of ambient pressure superconductivity in thin film La3Ni2O7

by Eun Kyo Ko

Nature, Published online: 19 December 2024; doi:10.1038/s41586-024-08525-3

19 Dec 2024 at 12:00am

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Quantum oscillations in the hole-doped cuprates and the confinement of spinons

by Pietro M. BonettiMaine ChristosSubir SachdevaDepartment of Physics, Harvard University, Cambridge, MA 02138

3 Dec 2024 at 9:00am

Dynamical theory of complex systems with two-way micro–macro causation

by John HarteMicah BrushKaito UmemuraPranav MuralikrishnanErica A. NewmanaThe Energy and Resources Group, University of California, Berkeley, CA 94720bThe Rocky Mountain Biological Laboratory, Gothic, CO 81224cThe Santa Fe Institute, Santa Fe, NM 87501dThe Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, AB T6G 2G1, CanadaeGraduate School of Human Development and Environment, Kobe University, Kobe, Hyogo 657-8501, JapanfUniversity of California, Berkeley, CA 94720gDepartment of Biology, James Madison University, Harrisonburg, VA 22801

6 Dec 2024 at 9:00am

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New Constraints on the Melting Temperature and Phase Stability of Shocked Iron up to 270 GPa Probed by Ultrafast X-Ray Absorption Spectroscopy

by S. Balugani, J. A. Hernandez, N. Sévelin-Radiguet, O. Mathon, V. Recoules, J. J. Kas, D. E. Eakins, H. Doyle, A. Ravasio, and R. Torchio

By measuring the melting temperature of iron under high transient pressure, researchers set a limit on the temperature at the boundary between the inner and outer cores.

18 Dec 2024 at 11:00am

Metallic Bonding in Close-Packed Structures: Structural Frustration from a Hidden Gauge Symmetry

by Eric He, C. M. Wilson, and R. Ganesh

Symmetry conditions dictated by band structure and nearest-neighbor interactions indicate why specific complex ordered structures are present in lithium and sodium under pressure.

17 Dec 2024 at 11:00am

Spin Waves and Three Dimensionality in the High-Pressure Antiferromagnetic Phase of ${\mathrm{SrCu}}_{2}({\mathrm{BO}}_{3}{)}_{2}$

by Ellen Fogh, Gaétan Giriat, Mohamed E. Zayed, Andrea Piovano, Martin Boehm, Paul Steffens, Irina Safiulina, Ursula B. Hansen, Stefan Klotz, Jian-Rui Soh, Ekaterina Pomjakushina, Frédéric Mila, Bruce Normand, and Henrik M. Rønnow

Quantum magnetic materials can provide explicit realizations of paradigm models in quantum many-body physics. In this context, ${\mathrm{SrCu}}_{2}({\mathrm{BO}}_{3}{)}_{2}$ is a faithful realization of the Shastry-Sutherland model for ideally frustrated spin dimers, even displaying several of its q…

11 Dec 2024 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

Growth and characterization of the ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7−δ}$ thin films: Dominant contribution of the ${d}_{{x}^{2}−{y}^{2}}$ orbital at ambient pressure

by Yuecong Liu, Mengjun Ou, Haifeng Chu, Huan Yang, Qing Li, Ying-Jie Zhang, and Hai-Hu Wen

Using the pulsed-laser-ablation technique, we successfully grew ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7−δ}$ thin films with $c$-axis orientation perpendicular to the film surface. X-ray diffraction showed that the (00l) peaks can be well-indexed to the ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{…

16 Dec 2024 at 11:00am

Breakdown of electron lone pair and insulator-to-metal transition in $\mathrm{Ti}{\mathrm{S}}_{3}$ under high pressure

by A. R. Atique Ulla, P. Modak, and Ashok K. Verma

Solid titanium trisulfide ($\mathrm{Ti}{\mathrm{S}}_{3}$), a layered semiconducting material, has attracted considerable attention in recent times because of its robust anisotropic optical and electronic properties, which opened tremendous application possibilities. In a recent experiment, it was ob…

13 Dec 2024 at 11:00am

Hydrostatic pressure effect on structural and transport properties of co-existing layered and disordered rock-salt phase of ${\mathrm{Li}}_{\mathrm{x}}{\mathrm{CoO}}_{2}$

by Thiagarajan Maran, Anil Jain, Muthukumaran Sundaramoorthy, Aditya Prasad Roy, Boby Joseph, Govindaraj Lingannan, Ashwin Mohan, Dipanshu Bansal, S. M. Yusuf, and Arumugam Sonachalam

It is widely believed that the origin of a significant cause of voltage and capacity fading observed in lithium (Li)-ion batteries is related to structural modifications occurring in the cathode material during the Li-ion insertion/deinsertion process. The Li-ion insertion/deinsertion mechanism and …

2 Dec 2024 at 11:00am

Assessing spin-density wave formation in ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ from electronic structure calculations

by Harrison LaBollita, Victor Pardo, Michael R. Norman, and Antia S. Botana

Materials with strongly interacting electrons can exhibit remarkable behaviors, such as stripe ordering, where charge and spin form periodic patterns. These states often precede unconventional superconductivity, as in the bilayer nickelate La3Ni2O7 under pressure. Using correlated density-functional methods, the authors interrogate possible magnetic ground states of La3Ni2O7. The stripe-ordered ground state reproduces several experimental features, including insulating behavior at ambient pressure and strong antiferromagnetic coupling within the Ni-dz2 orbitals. Moreover, they find that the Ni-dx2−y2 orbitals play a dominant role at low-energy. Overall, their findings provide fresh insights into the stripe ordering and its potential link to superconductivity in this fascinating material.

20 Nov 2024 at 11:00am

First-principles design of ambient-pressure ${\mathrm{Mg}}_{x}{\mathrm{B}}_{2}{\mathrm{C}}_{2}$ and ${\mathrm{Na}}_{x}\mathrm{BC}$ superconductors

by Charlsey R. Tomassetti, Daviti Gochitashvili, Christopher Renskers, Elena R. Margine, and Aleksey N. Kolmogorov

We employ ab initio modeling to investigate the possibility of attaining high-temperature conventional superconductivity in ambient-pressure materials based on the known ${\mathrm{MgB}}_{2}{\mathrm{C}}_{2}$ and recently proposed thermodynamically stable NaBC ternary compounds. The constructed $(T,{P…

14 Nov 2024 at 11:00am

Pressure weakens coupling strength in In and Sn elemental superconductors

by Rustem Khasanov and Giovanni A. Ummarino

The pressure dependence of the thermodynamic critical field ${B}_{\mathrm{c}}$ in elemental indium (In) and tin (Sn) superconductors was studied by means of muon-spin rotation/relaxation. Pressure enhances the deviation of ${B}_{\mathrm{c}}(T)$ from the parabolic behavior expected for a typical type…

20 Dec 2024 at 11:00am

${\mathrm{H}}_{2}\text{−}{\mathrm{CH}}_{4}$ van der Waals compounds under rapid compression

by Jinwei Yan, Israel Osmond, Ross T. Howie, Eugene Gregoryanz, and Miriam Peña-Alvarez

Under high pressure, methane and hydrogen form ${({\mathrm{CH}}_{4})}_{2}{\mathrm{H}}_{2}, {\mathrm{CH}}_{4}{({\mathrm{H}}_{2})}_{2}$, and ${({\mathrm{CH}}_{4})}_{3}{({\mathrm{H}}_{2})}_{25}$ van der Waals compounds with stoichiometries determined by the ${\mathrm{H}}_{2}$ concentration. This study …

19 Dec 2024 at 11:00am

Observation of double superconducting domes in multilayer tellurene under high pressure

by Can Tian, Yiwei Ye, Chenchen Liu, Yuchen Zhang, and Xiaoli Huang

Intensive investigation of elemental two-dimensional (2D) materials with anisotropic structures holds promise for unraveling novel physical phenomena and clarifying the relationship between dimensionality and superconductivity. Here, we successfully observed unprecedented double superconducting dome…

19 Dec 2024 at 11:00am

Photoinduced phase transition on black samarium monosulfide

by Hiroshi Watanabe, Yusuke Takeno, Yusuke Negoro, Ryohei Ikeda, Yuria Shibata, Yitong Chen, Takuto Nakamura, Kohei Yamagami, Yasuyuki Hirata, Yujun Zhang, Ryunosuke Takahashi, Hiroki Wadati, Kenji Tamasaku, Keiichiro Imura, Hiroyuki S. Suzuki, Noriaki K. Sato, and Shin-ichi Kimura

Samarium monosulfide (SmS) is known to present a pressure-induced phase transition (BGT) from a black-colored insulator (BI) to a golden yellow colored metal (GM). To investigate the role of excitonic instability in BGT, the authors measure here the changes in electronic structure and lattice constant after pulse-laser excitations. The photoexcitation creates a photoinduced phase slightly different from the BI state, but utterly different from the GM state, suggesting that BGT requires effects other than the appearance of excitons.

19 Dec 2024 at 11:00am

High pressure induced superconductivity and chirality-neutral Fermi surface in $\mathrm{SrS}{\mathrm{i}}_{2}$

by M.-Y. Yao, J. Noky, Q.-G. Mu, K. Manna, N. Kumar, V. N. Strocov, C. Shekhar, S. Medvedev, Y. Sun, and C. Felser

In this study, we investigate the electronic structure and topological properties of the compound $\mathrm{SrS}{\mathrm{i}}_{2}$ using angle-resolved photoemission spectroscopy (ARPES), electrical transport measurements, and ab initio calculations. In contrast to recent theoretical predictions that …

18 Dec 2024 at 11:00am

High-temperature superconductivity of ternary $\mathrm{C}{\mathrm{a}}_{4}{\mathrm{B}}_{x}{\mathrm{C}}_{23−x}$ clathrates at moderate pressure

by Peng Chen, Zepeng Wu, Yang Sun, Tie-Yu Lü, Xinrui Cao, Zi-zhong Zhu, and Shunqing Wu

The synthesis of $\mathrm{Sr}{\mathrm{B}}_{3}{\mathrm{C}}_{3}$ and the research on its analogs demonstrate the high-temperature superconductivity of ternary metal-boron-carbon clathrates at ambient or moderate pressure. Here, we explore the stability and superconductivity of calcium-doped and boron-…

17 Dec 2024 at 11:00am

Synthesis of ${\mathrm{Mg}}_{2}{\mathrm{IrH}}_{5}$: A potential pathway to high-${T}_{c}$ hydride superconductivity at ambient pressure

by Mads F. Hansen, Lewis J. Conway, Kapildeb Dolui, Christoph Heil, Chris J. Pickard, Anna Pakhomova, Mohammed Mezouar, Martin Kunz, Rohit P. Prasankumar, and Timothy A. Strobel

Following long-standing predictions associated with hydrogen, high-temperature superconductivity has recently been observed in several hydride-based materials. Nevertheless, these high-${T}_{c}$ phases only exist at extremely high pressures, and achieving high transition temperatures at ambient pres…

17 Dec 2024 at 11:00am

Pressure-induced change in the local Peierls distortion structure of molten selenium

by Yuning Song, Gang Zhao, Feifei Wang, Mingcui Ding, Xuguang Zhao, and Dehua Wang

It was recently reported that molten sulfur exhibits a first-order liquid-liquid transition (LLT) with a critical point. The phase diagrams of selenium (Se) and sulfur are very similar, and experiments have suggested that LLT may also happen in molten Se. Here, complete ab initio molecular dynamics …

16 Dec 2024 at 11:00am

Multiphase equation of state for magnesium based on first-principles simulations

by Li-Ting Li, Xing-Yu Gao, Hai-Feng Liu, Jia-Wei Xian, Fu-Yang Tian, and Hai-Feng Song

We perform first-principles simulations to construct a multiphase equation of state (EOS) for magnesium (Mg) up to a pressure-temperature $(P\text{−}T)$ range of 600 GPa and 8000 K. The phases considered include the solid hexagonal close-packed (hcp) and body-centered cubic (bcc) phases and the liqu…

16 Dec 2024 at 11:00am

Synchrotron x-ray diffraction and DFT study of non-centrosymmetric EuRhGe3 under high pressure

by N. S. Dhami V. Balédent I. Batistić O. Bednarchuk D. Kaczorowski J. P. Itié S. R. Shieh C. M. N. Kumar Y. Utsumi a Department for Research of Materials Under Extreme Conditions, Institute of Physics, Zagreb, Croatiab Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, Francec Department of Physics, Faculty of Science, University of Zagreb, Zagreb, Croatiad Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wrocław, Polande PSICHÉ beamline, Synchrotron SOLEIL, Saint-Aubin, Francef Department of Earth Sciences, Department of Physics and Astronomy, University of Western Ontario, London, Ontario, Canadag Department of Molecular Magnetism, The Henryk Niewodniczański, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland

4 Sep 2024 at 4:50am

Use of molybdenum as a pressure calibrant in a cubic press and sound velocity measurement of tungsten to 5 GPa

by Wei Song Chao Liu Chang Su Yonggang Liu 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 School of Earth Sciences, Institute of Disaster Prevention, Sanhe, People’s Republic of China

11 Nov 2024 at 6:22am

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

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