EHPRG

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.

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

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Expression of Concern: Synthesis of Yttrium Superhydride Superconductor with a Transition Temperature up to 262 K by Catalytic Hydrogenation at High Pressures [Phys. Rev. Lett. 126, 117003 (2021)]
by Elliot Snider, Nathan Dasenbrock-Gammon, Raymond McBride, Xiaoyu Wang, Noah Meyers, Keith V. Lawler, Eva Zurek, Ashkan Salamat, and Ranga P. Dias
Author(s): Elliot Snider, Nathan Dasenbrock-Gammon, Raymond McBride, Xiaoyu Wang, Noah Meyers, Keith V. Lawler, Eva Zurek, Ashkan Salamat, and Ranga P. Dias
[Phys. Rev. Lett. 131, 239902] Published Thu Dec 07, 2023
7 Dec 2023 at 11:00am
${\mathrm{s}}^{±}$-Wave Pairing and the Destructive Role of Apical-Oxygen Deficiencies in ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ under Pressure
by Yu-Bo Liu, Jia-Wei Mei, Fei Ye, Wei-Qiang Chen, and Fan Yang
Author(s): Yu-Bo Liu, Jia-Wei Mei, Fei Ye, Wei-Qiang Chen, and Fan Yang


Recently, the bilayer perovskite nickelate ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ has been reported to show evidence of high-temperature superconductivity (SC) under a moderate pressure of about 14 GPa. To investigate the superconducting mechanism, pairing symmetry, and the role of api…


[Phys. Rev. Lett. 131, 236002] Published Tue Dec 05, 2023
5 Dec 2023 at 11:00am
Optimality Pressures toward Lateralization of Complex Brain Functions
by Luís F. Seoane
Author(s): Luís F. Seoane


A mathematical model shows how increased intricacy of cognitive tasks can break the mirror symmetry of the brain’s neural network.


[Phys. Rev. X 13, 031028] Published Wed Sep 13, 2023
13 Sep 2023 at 12:00pm
Ramp Compression of Germanium Dioxide to Extreme Conditions: Phase Transitions in an ${\mathrm{SiO}}_{2}$ Analog
by D. Kim, I. K. Ocampo, R. F. Smith, F. Coppari, M. Millot, J. K. Wicks, J. R. Rygg, J. H. Eggert, and T. S. Duffy
Author(s): D. Kim, I. K. Ocampo, R. F. Smith, F. Coppari, M. Millot, J. K. Wicks, J. R. Rygg, J. H. Eggert, and T. S. Duffy


Observation of the crystal structure of GeO2 at pressures of hundreds of gigapascals offers insights into the high-pressure behavior of SiO2, which is expected to exist in the deep interior of large rocky exoplanets.


[Phys. Rev. X 13, 031025] Published Fri Sep 08, 2023
8 Sep 2023 at 12:00pm
Colloquium: Room temperature superconductivity: The roles of theory and materials design
by Warren E. Pickett
Author(s): 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.


[Rev. Mod. Phys. 95, 021001] Published Fri Apr 07, 2023
7 Apr 2023 at 12:00pm
Pressure-enhanced superconducting transition in the inter-block-layer electron-transfer superconductor $\mathrm{Ba}{\mathrm{Th}}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{({\mathrm{N}}_{0.7}{\mathrm{O}}_{0.3})}_{2}$
by Pengfei Shan, Pengtao Yang, Yeting Shao, Ziyi Liu, Jun Hou, Bosen Wang, Yoshiya Uwatoko, Guanghan Cao, Jianping Sun, and Jinguang Cheng
Author(s): Pengfei Shan, Pengtao Yang, Yeting Shao, Ziyi Liu, Jun Hou, Bosen Wang, Yoshiya Uwatoko, Guanghan Cao, Jianping Sun, and Jinguang Cheng


The 12442-type hybrid structure compound $\mathrm{Ba}{\mathrm{Th}}_{2}{\mathrm{Fe}}_{4}{\mathrm{As}}_{4}{({\mathrm{N}}_{0.7}{\mathrm{O}}_{0.3})}_{2}$ is a recently synthesized inter-block-layer electron-transfer superconductor with separated double ${\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ layer and show…


[Phys. Rev. Materials 7, 124801] Published Thu Dec 07, 2023
7 Dec 2023 at 11:00am
Crystal plasticity finite element simulation of lattice rotation and x-ray diffraction during laser shock compression of tantalum
by P. Avraam, D. McGonegle, P. G. Heighway, C. E. Wehrenberg, E. Floyd, A. J. Comley, J. M. Foster, S. D. Rothman, J. Turner, S. Case, and J. S. Wark
Author(s): P. Avraam, D. McGonegle, P. G. Heighway, C. E. Wehrenberg, E. Floyd, A. J. Comley, J. M. Foster, S. D. Rothman, J. Turner, S. Case, and J. S. Wark


We present a crystal plasticity model tailored for high-pressure, high-strain-rate conditions that uses a multiscale treatment of dislocation-based slip kinetics. We use this model to analyze the pronounced plasticity-induced lattice rotations observed in shock-compressed polycrystalline tantalum vi…


[Phys. Rev. Materials 7, 113608] Published Mon Nov 27, 2023
27 Nov 2023 at 11:00am
Refined phase diagram and kagome-lattice superconductivity in Mg-Si system
by Da-Bao Zha, Peng Jiang, Hong-Mei Huang, and Yan-Ling Li
Author(s): Da-Bao Zha, Peng Jiang, Hong-Mei Huang, and Yan-Ling Li


In this work, by employing a variable-composition evolutionary algorithm combined with first-principles calculations, we have performed a comprehensive structural search for the magnesium silicide (Mg-Si) system and determined a hyperfine pressure-composition phase diagram. Three new pressure-stabil…


[Phys. Rev. Materials 7, 114805] Published Mon Nov 20, 2023
20 Nov 2023 at 11:00am
Superconducting pairing symmetry in ${\mathrm{MoTe}}_{2}$
by M. M. Piva, L. O. Kutelak, R. Borth, Y. Liu, C. Petrovic, R. D. dos Reis, and M. Nicklas
Author(s): M. M. Piva, L. O. Kutelak, R. Borth, Y. Liu, C. Petrovic, R. D. dos Reis, and M. Nicklas


Topological superconductors have long been sought for their potential use in quantum computing. The type-II Weyl semimetal ${\mathrm{MoTe}}_{2}$ is an obvious candidate, exhibiting a superconducting state below 500 mK at ambient pressure, but the question remains whether the pairing is conventional …


[Phys. Rev. Materials 7, L111801] Published Thu Nov 16, 2023
16 Nov 2023 at 11:00am
Transition from electron-dominated to phonon-driven thermal transport in tungsten under extreme pressures
by Niraj Bhatt, Pravin Karna, Sandip Thakur, and Ashutosh Giri
Author(s): Niraj Bhatt, Pravin Karna, Sandip Thakur, and Ashutosh Giri


By utilizing a combination of first-principles calculations and machine-learning-interatomic-potential-based molecular dynamics simulations, we show that (contrary to the conventional understanding of electron-driven thermal transport in metals) the dominant carriers of heat in tungsten are phonons …


[Phys. Rev. Materials 7, 115001] Published Wed Nov 08, 2023
8 Nov 2023 at 11:00am
Structural prediction of Fe-Mg-O compounds at super-Earth's pressures
by Yimei Fang, Yang Sun, Renhai Wang, Feng Zheng, Feng Zhang, Shunqing Wu, Cai-Zhuang Wang, Renata M. Wentzcovitch, and Kai-Ming Ho
Author(s): Yimei Fang, Yang Sun, Renhai Wang, Feng Zheng, Feng Zhang, Shunqing Wu, Cai-Zhuang Wang, Renata M. Wentzcovitch, and Kai-Ming Ho


Terrestrial exoplanets are of great interest for being simultaneously similar to and different from Earth. Their compositions are likely comparable to those of solar-terrestrial objects, but their internal pressures and temperatures can vary significantly with their masses/sizes. The most abundant n…


[Phys. Rev. Materials 7, 113602] Published Mon Nov 06, 2023
6 Nov 2023 at 11:00am
Superconductivity in $\mathrm{Hf}{\mathrm{S}}_{2}$ at ultrahigh pressure
by Shihui Zhang, Hailun Wang, Hao Liu, Jiapeng Zhen, Shun Wan, Wen Deng, Yonghao Han, Bin Chen, and Chunxiao Gao
Author(s): Shihui Zhang, Hailun Wang, Hao Liu, Jiapeng Zhen, Shun Wan, Wen Deng, Yonghao Han, Bin Chen, and Chunxiao Gao


Adjusting the electrical and optical properties of two-dimensional materials by pressure is an important method to realize their applications in the fields of electronics and optoelectronic devices. Here, we report the highly tunable transport properties of the layered semiconductor $\mathrm{Hf}{\ma…


[Phys. Rev. Materials 7, 104802] Published Tue Oct 31, 2023
31 Oct 2023 at 11:00am
Role of volume change on the physics of thermoelectric half-Heusler compounds
by M. Yazdani-Kachoei, S. Li, W. Sun, S. Mehdi Vaez Allaei, and I. Di Marco
Author(s): M. Yazdani-Kachoei, S. Li, W. Sun, S. Mehdi Vaez Allaei, and I. Di Marco


Doping at particular sites is a common method for increasing the thermoelectric efficiency of materials, by tuning carrier concentration and electronic structure. A secondary effect of doping, as well as defects, is to induce a volume change, usually referred to as chemical pressure, that may affect…


[Phys. Rev. Materials 7, 104602] Published Wed Oct 25, 2023
25 Oct 2023 at 12:00pm
Tailoring negative pressure by crystal defects: Microcrack induced hydride formation in Al alloys
by Ali Tehranchi, Poulami Chakraborty, Martí López Freixes, Eunan J. McEniry, Baptiste Gault, Tilmann Hickel, and Jörg Neugebauer
Author(s): Ali Tehranchi, Poulami Chakraborty, Martí López Freixes, Eunan J. McEniry, Baptiste Gault, Tilmann Hickel, and Jörg Neugebauer


Climate change motivates the search for non-carbon-emitting energy generation and storage solutions. Metal hydrides show promising characteristics for this purpose. They can be further stabilized by tailoring the negative pressure of microstructural and structural defects. Using systematic ab initio…


[Phys. Rev. Materials 7, 105401] Published Tue Oct 17, 2023
17 Oct 2023 at 12:00pm
Pressure-induced formation of cubic lutetium hydrides derived from trigonal ${\mathrm{LuH}}_{3}$
by Owen Moulding, Samuel Gallego-Parra, Yingzheng Gao, Pierre Toulemonde, Gaston Garbarino, Patricia De Rango, Sébastien Pairis, Pierre Giroux, and Marie-Aude Méasson
Author(s): Owen Moulding, Samuel Gallego-Parra, Yingzheng Gao, Pierre Toulemonde, Gaston Garbarino, Patricia De Rango, Sébastien Pairis, Pierre Giroux, and Marie-Aude Méasson


In recent years, there has been a fervent search for room-temperature superconductivity within the binary hydrides. However, as the number of untested compounds dwindled, it became natural to begin searching within the ternary hydrides. This led to the controversial discovery of room-temperature sup…


[Phys. Rev. B 108, 214505] Published Mon Dec 04, 2023
4 Dec 2023 at 11:00am
Influence of magnetism, strain, and pressure on the band topology of ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$
by Adrian Valadkhani, Mikel Iraola, Axel Fünfhaus, Young-Joon Song, Libor Šmejkal, Jairo Sinova, and Roser Valentí
Author(s): Adrian Valadkhani, Mikel Iraola, Axel Fünfhaus, Young-Joon Song, Libor Šmejkal, Jairo Sinova, and Roser Valentí


Motivated by the wealth of proposals and realizations of nontrivial topological phases in ${\mathrm{EuCd}}_{2}{\mathrm{As}}_{2}$, such as a Weyl semimetallic state and the recently controversially discussed semimetallic versus semiconductor behavior in this system, we analyze in this work the role o…


[Phys. Rev. B 108, 235113] Published Mon Dec 04, 2023
4 Dec 2023 at 11:00am
A novel mechanism for low- and high pressure measurement with variable-thickness diaphragm
by Hamed YaghootiAbbas Paka Department of Mechanical Engineering, Arak University of Technology, Arak, Iranb Department of Mechanical Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Iran
Volume 43, Issue 4, December 2023, Page 293-305
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30 Oct 2023 at 1:24pm
The study of steel wire winding split type ultrahigh pressure die based on different winding methods
by Zhiwei LiuCaihua YangSong GuoFeng DingCollege of Mechanical Engineering, Anhui University of Science & Technology, Anhui Huainan, People’s Republic of China
Volume 43, Issue 4, December 2023, Page 306-314
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30 Oct 2023 at 1:24pm
Structure evolution of fluorapophyllite-(K) under high pressure
by Yurii V. SeryotkinMark A. Ignatova 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
Volume 43, Issue 4, December 2023, Page 279-292
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21 Aug 2023 at 8:44am
High-pressure synthesis of half-doped perovskites MnV0.5Nb0.5O3 and MnV0.5Ta0.5O3 with unusual A-site small Mn2+ cations
by Xun KangHiroaki HayashiAlexei A. BelikYoshihiro TsujimotoKazunari Yamauraa Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki, Japanb Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, Hokkaido, Japan
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21 Nov 2023 at 6:09am