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.

Natural selection could determine whether Acropora corals persist under expected climate change | Science

28 Nov 2024 at 3:01pm

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Enhancement of Harmonic Heating by Magnetized Plasma Series Resonance in Capacitive Radio Frequency Discharges

by Jing-Yu Sun, Fei Gao, Fang-Jie Zhou, Julian Schulze, and You-Nian Wang

We present a novel resonance mode in capacitive radio frequency (rf) discharges in the presence of an oblique magnetic field at low pressures. We observe the self-excitation of high-frequency harmonics of the current in magnetized capacitive rf discharges through the magnetized plasma series resonan…

6 Dec 2024 at 11:00am

Giant Splitting of the Hydrogen Rotational Eigenenergies in the ${\mathrm{C}}_{2}$ Filled Ice

by Simone Di Cataldo, Maria Rescigno, Lorenzo Monacelli, Umbertoluca Ranieri, Richard Gaal, Stefan Klotz, Jacques Ollivier, Michael Marek Koza, Cristiano De Michele, and Livia Eleonora Bove

Hydrogen hydrates exhibit a rich phase diagram influenced by both pressure and temperature, with the so-called ${\mathrm{C}}_{2}$ phase emerging prominently above 2.5 GPa. In this phase, hydrogen molecules are densely packed within a cubic icelike lattice and the interaction with the surrounding wat…

6 Dec 2024 at 11:00am

Erratum: Inertial Migration in a Pressure-Driven Channel Flow: Beyond the Segre-Silberberg Pinch [Phys. Rev. Lett. 132, 054002 (2024)]

by Prateek Anand and Ganesh Subramanian

6 Dec 2024 at 11:00am

Pressure-Dependent Electronic Superlattice in the Kagome Superconductor ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$

by F. Stier, A.-A. Haghighirad, G. Garbarino, S. Mishra, N. Stilkerich, D. Chen, C. Shekhar, T. Lacmann, C. Felser, T. Ritschel, J. Geck, and M. Le Tacon

We present a high-resolution single crystal x-ray diffraction study of kagome superconductor ${\mathrm{CsV}}_{3}{\mathrm{Sb}}_{5}$, exploring its response to variations in pressure and temperature. We discover that at low temperatures, the structural modulations of the electronic superlattice, commo…

4 Dec 2024 at 11:00am

Absence of High-Pressure Ground-State Reentrant Ferroelectricity in ${\mathrm{PbTiO}}_{3}$

by R. E. Cohen, Yangzheng Lin, Muhtar Ahart, and Russell J. Hemley

We study ferroelectricity in the classic perovskite ferroelectric ${\mathrm{PbTiO}}_{3}$ to high pressures with density functional theory (DFT) and experimental diamond-anvil techniques. We use second harmonic generation spectroscopy to detect lack of inversion symmetry. Consistent with early unders…

3 Dec 2024 at 11:00am

Origin of the Suppression of Magnetic Order in MnSi under Hydrostatic Pressure

by P. Dalmas de Réotier, A. Yaouanc, D. Andreica, R. Gupta, R. Khasanov, and G. Lapertot

Muon spin rotation measurements show that the magnetic-order suppression in MnSi under hydrostatic pressure arises from the collapse of the exchange interaction and not from quantum fluctuations.

2 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

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

Non-Fermi liquid and antiferromagnetic correlations with hole doping in the bilayer two-orbital Hubbard model of ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ at zero temperature

by Yin Chen, Yi-Heng Tian, Jia-Ming Wang, Rong-Qiang He, and Zhong-Yi Lu

High-${T}_{c}$ superconductivity (SC) was recently found in the bilayer material ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ (La327) under high pressures. We study the bilayer two-orbital Hubbard model derived from the band structure of the La327. The model is solved by cluster dynamical me…

6 Dec 2024 at 11:00am

Pressure-induced quantum melting of chiral spin order and subsequent transition to a degenerate semiconductor state in FeGe

by Y. Fujishiro, C. Terakura, A. Miyake, N. Kanazawa, K. Nakazawa, N. Ogawa, H. Kadobayashi, S. Kawaguchi, T. Kagayama, M. Tokunaga, Y. Kato, Y. Motome, K. Shimizu, and Y. Tokura

The authors reveal here anomalous charge transport upon melting of chiral spin orders, such as helical and skyrmion spin textures, in the itinerant chiral magnet FeGe. Under high pressure, significant modifications in the electronic structure induce a metal-to-semiconductor transition. Remarkably, a spontaneous anomalous Hall effect is observed in the short-range-ordered chiral spin ground state (P= 20–30 GPa) beyond the quantum phase transition. This macroscopic time-reversal symmetry breaking in the absence of long-range magnetic order represents a highly unconventional phenomenon.

5 Dec 2024 at 11:00am

Theoretical prediction of high-temperature superconductivity in ${\mathrm{SrAuH}}_{3}$ at ambient pressure

by Bin Li, Cong Zhu, Junjie Zhai, Chuanhui Yin, Yuxiang Fan, Jie Cheng, Shengli Liu, and Zhixiang Shi

We present a comprehensive computational investigation of electron-phonon interactions in $MX{\mathrm{H}}_{3}$ hydride compounds, where $M$ represents alkali and post-transition metals, and $X$ denotes $3d$, $4d$, and $5d$ transition metals. Our density functional theory calculations identify 17 dyn…

3 Dec 2024 at 11:00am

Erratum: Pressure-induced phase transition and increase of oxygen-iodine coordination in magnesium iodate [Phys. Rev. B 105, 054105 (2022)]

by A. Liang, R. Turnbull, C. Popescu, F. J. Manjón, E. Bandiello, P. Rodriguez-Hernandez, A. Muñoz, I. Yousef, Z. Hebboul, and D. Errandonea

2 Dec 2024 at 11:00am

Shock compression pathways to pyrite silica from machine learning simulations

by Shuning Pan, Jiuyang Shi, Zhixin Liang, Cong Liu, Junjie Wang, Yong Wang, Hui-Tian Wang, Dingyu Xing, and Jian Sun

Silica is a fundamental component of planetary interiors, and the knowledge of its high-pressure polymorphs is essential for constructing planetary models. The pyrite silica has been synthesized in static compression with diamond anvil cells, however, it has never been observed in dynamic compressio…

2 Dec 2024 at 11:00am

Electronic correlations and long-range magnetic ordering in NiO tuned by pressure

by G. M. Gaifutdinov and I. V. Leonov

Using the density functional theory plus dynamical mean-field theory method, we revisit the pressure-temperature phase diagram of the prototypical correlated insulator NiO. We study the pressure-induced evolution of the electronic structure, magnetic state, and exchange couplings of the antiferromag…

2 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

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