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 high pressure meetings

The current COVID pandemic has led to the cancellation of numerous scientific conferences over the last year, including the 2020 GRC and GRS high-pressure conferences, and the combined AIRAPT/EHPRG-2021 conference that was to be held in Edinburgh this summer. The negative effects of this are being most keenly felt by younger researchers, who have missed golden opportunities to present both their work, and themselves, to the rest of the community.
This online conference aims to address this, by providing up to 360 20-minute oral presentations in which young and early career researchers in our field to present their research to the rest of our international community. Such researchers will be offered the great majority of these slots, complemented by some didactic talks from more established researchers and facility operators. Everyone in the high-pressure community is welcome to attend.
CESC-2021 will be chaired by Malcolm McMahon.
For more information, please visit the official webpage of CSEC2021.

## Upcoming EHPRG Meeting

The Joint 28th AIRAPT and 60th EHPRG International Conference on High Pressure Science and Technology (AIRAPT-2021), originally scheduled for July 2021, has been postponed, and will be held in Edinburgh, UK, in 2023. Exact dates will be announced as soon as possible. AIRAPT-21 will be chaired by Malcolm McMahon (CSEC and University of Edinburgh, UK).
In spite of the Joint AIRAPT-EHPRG Conference, an online Conference on Science at Extreme Conditions will take place in 2021. This online event will have a special focus on young and early career researchers. This will NOT be an AIRAPT/EHPRG conference, but the organizers expect to be able to offer up to 360 slots for 20-minute, and 5-minute “lightning”, oral presentations, spread over 5 days, each of which will have two 2-hour time slots (11am-1pm and 3-5pm UK time), timed so as to provide “office hours” access to speakers from Asia/Europe and Americas/Europe, respectively. Each 2-hour time slot will host up to 6 parallel sessions. The great majority of the available slots for talks will be given to young researchers, complemented by some didactic presentations from more established researchers and facility providers. Everyone in the high-pressure community is welcome to attend.
For more information, please visit the official webpage of AIRAPT-21.

## High-pressure in the headlines

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

[CaRP] Can't open remote newsfeed [404].
Chemical transformations of [MAu8(PPh3)8]2+ (M = Pt, Pd) and [Au9(PPh3)8]3+ in methanol induced by irradiation of atmospheric pressure plasma
by Sojiro Emori
The Journal of Chemical Physics, Volume 155, Issue 12, September 2021.
The reaction processes of ligand-protected metal clusters induced by irradiating atmospheric pressure plasma (APP) were investigated using optical spectroscopy, mass spectrometry, and density functional theory (DFT) calculations. The target clusters were phosphine-protected gold-based clusters [MAu8(PPh3)8]2+ (M = Pt, Pd) and [Au9(PPh3)8]3+, which have a crown-shaped M@Au8 (M = Pt, Pd, Au) core with an unligated M site at the central position. The APP irradiation of [MAu8(PPh3)8]2+ (M = Pt, Pd) in methanol resulted in the selective formation of [PtAu8(PPh3)8CO]2+ and [PdAu9(PPh3)8CN]2+ via the addition of a CO molecule and AuCN unit, respectively, generated in situ by the APP irradiation. In contrast, the APP irradiation of [Au9(PPh3)8]3+ in methanol yielded [Au9(PPh3)7(CN)1]2+ and [Au10(PPh3)7(CN)2]2+ as the main products, which were produced by sequential addition of AuCN to reactive [Au8(PPh3)7]2+ formed by dissociation equilibrium of [Au9(PPh3)8]3+. DFT calculations predicted that a unique chain-like {–(CNAu)n–PPh3} (n = 1, 2) ligand was formed via the sequential insertion of –CNAu– units into the Au–PPh3 bond of [PdAu8(PPh3)8]2+ and [Au8(PPh3)7]2+. These findings open up a new avenue for developing novel metal clusters via the chemical transformation of atomically defined metal clusters by APP irradiation.
29 Sep 2021 at 2:00pm
Layer-Dependent Pressure Effect on the Electronic Structure of 2D Black Phosphorus
by Shenyang Huang, Yang Lu, Fanjie Wang, Yuchen Lei, Chaoyu Song, Jiasheng Zhang, Qiaoxia Xing, Chong Wang, Yuangang Xie, Lei Mu, Guowei Zhang, Hao Yan, Bin Chen, and Hugen Yan
Author(s): Shenyang Huang, Yang Lu, Fanjie Wang, Yuchen Lei, Chaoyu Song, Jiasheng Zhang, Qiaoxia Xing, Chong Wang, Yuangang Xie, Lei Mu, Guowei Zhang, Hao Yan, Bin Chen, and Hugen Yan

Through infrared spectroscopy, we systematically study the pressure effect on electronic structures of few-layer black phosphorus (BP) with layer number ranging from 2 to 13. We reveal that the pressure-induced shift of optical transitions exhibits strong layer dependence. In sharp contrast to the b...

[Phys. Rev. Lett. 127, 186401] Published Tue Oct 26, 2021
26 Oct 2021 at 12:00pm
Structure of High-Pressure Supercooled and Glassy Water
by Riccardo Foffi and Francesco Sciortino
Author(s): Riccardo Foffi and Francesco Sciortino

We numerically investigate the structure of deep supercooled and glassy water under pressure, covering the range of densities corresponding to the experimentally produced high- and very-high-density amorphous phases. At $T=188\text{ }\text{ }\mathrm{K}$, a continuous increase in density is observed ...

[Phys. Rev. Lett. 127, 175502] Published Tue Oct 19, 2021
19 Oct 2021 at 12:00pm
Coexistence of Surface Superconducting and Three-Dimensional Topological Dirac States in Semimetal KZnBi
by Junseong Song, Sunghun Kim, Youngkuk Kim, Huixia Fu, Jahyun Koo, Zhen Wang, Gyubin Lee, Jouhahn Lee, Sang Ho Oh, Joonho Bang, Taku Matsushita, Nobuo Wada, Hiroki Ikegami, Jonathan D. Denlinger, Young Hee Lee, Binghai Yan, Yeongkwan Kim, and Sung Wng Kim
Author(s): Junseong Song, Sunghun Kim, Youngkuk Kim, Huixia Fu, Jahyun Koo, Zhen Wang, Gyubin Lee, Jouhahn Lee, Sang Ho Oh, Joonho Bang, Taku Matsushita, Nobuo Wada, Hiroki Ikegami, Jonathan D. Denlinger, Young Hee Lee, Binghai Yan, Yeongkwan Kim, and Sung Wng Kim

A newly discovered 3D topological Dirac semimetal exhibits surface superconductivity at ambient pressure, a key step in the development of systems sought after for quantum computation.

[Phys. Rev. X 11, 021065] Published Mon Jun 28, 2021
28 Jun 2021 at 12:00pm
Pressure-induced structural phase transition and suppression of Jahn-Teller distortion in the quadruple perovskite structure
by V. S. Bhadram, B. Joseph, D. Delmonte, E. Gilioli, B. Baptiste, Y. Le Godec, R. P. S. M. Lobo, and A. Gauzzi
Author(s): V. S. Bhadram, B. Joseph, D. Delmonte, E. Gilioli, B. Baptiste, Y. Le Godec, R. P. S. M. Lobo, and A. Gauzzi

By means of in situ synchrotron x-ray diffraction and Raman spectroscopy under hydrostatic pressure, we investigate the structural stability of the quadruple perovskite $\mathrm{La}{\mathrm{Mn}}_{7}{\mathrm{O}}_{12}$. At 34 GPa, the data unveil a first-order structural phase transition from monoclin...

[Phys. Rev. Materials 5, 104411] Published Tue Oct 26, 2021
26 Oct 2021 at 12:00pm
Influence of Cr substitution on the reversibility of the magnetocaloric effect in Ni-Cr-Mn-In Heusler alloys
by C. Salazar-Mejía, P. Devi, S. Singh, C. Felser, and J. Wosnitza
Author(s): C. Salazar-Mejía, P. Devi, S. Singh, C. Felser, and J. Wosnitza

We present the effect of substitution-induced pressure on the reversibility of the magnetocaloric effect (MCE) in ${\mathrm{Ni}}_{2}{\mathrm{Cr}}_{x}{\mathrm{Mn}}_{1.4−x}{\mathrm{In}}_{0.6}$ ($x=0.1$, 0.2, 0.3) alloys, through characterization in pulsed magnetic fields. We measured the adiabatic tem...

[Phys. Rev. Materials 5, 104406] Published Wed Oct 13, 2021
13 Oct 2021 at 12:00pm
Ab initio prediction of nontrivial topological band and superconductivity in stable metallic Si allotropes at ambient pressure
by Yoon-Gu Kang, In-Ho Lee, Myung Joon Han, and Kee Joo Chang
Author(s): Yoon-Gu Kang, In-Ho Lee, Myung Joon Han, and Kee Joo Chang

Silicon is a semiconductor and widely used as the key element for modern electronic devices. Various metallic superconducting phases have been reported, but most retain their crystal structure at high pressures. Thus, it remains a challenge to search for potential superconducting Si allotropes. In this article, the authors propose novel metallic Si allotropes that meet the conditions for dynamic, mechanical, and thermal stability at ambient pressure through machine learning and first-principles electronic structure calculations. The new allotropes are superconductors and even exhibit a nontrivial band topology, providing a promising platform for realizing a topological superconducting state in all-Si systems.

[Phys. Rev. Materials 5, 104802] Published Wed Oct 13, 2021
13 Oct 2021 at 12:00pm
Automated free-energy calculation from atomistic simulations
by Sarath Menon, Yury Lysogorskiy, Jutta Rogal, and Ralf Drautz
Author(s): Sarath Menon, Yury Lysogorskiy, Jutta Rogal, and Ralf Drautz

We devise automated workflows for the calculation of Helmholtz and Gibbs free energies and their temperature and pressure dependence and provide the corresponding computational tools. We employ nonequilibrium thermodynamics for evaluating the free energy of solid and liquid phases at a given tempera...

[Phys. Rev. Materials 5, 103801] Published Mon Oct 11, 2021
11 Oct 2021 at 12:00pm
Magnetocaloric effect in the Laves-phase ${\mathrm{Ho}}_{1−x}{\mathrm{Dy}}_{x}{\mathrm{Al}}_{2}$ family in high magnetic fields
by E. Bykov, W. Liu, K. Skokov, F. Scheibel, O. Gutfleisch, S. Taskaev, V. Khovaylo, D. Plakhotskiy, C. Salazar Mejia, J. Wosnitza, and T. Gottschall
Author(s): E. Bykov, W. Liu, K. Skokov, F. Scheibel, O. Gutfleisch, S. Taskaev, V. Khovaylo, D. Plakhotskiy, C. Salazar Mejia, J. Wosnitza, and T. Gottschall

Hydrogen has the largest gravimetric energy density among all chemical fuels. At the same time, the density of gaseous ${\mathrm{H}}_{2}$ is extremely low, which makes its compression to high pressures, liquefaction, or solid-state storage necessary for transport purposes. Liquid hydrogen ($\mathrm{... [Phys. Rev. Materials 5, 095405] Published Mon Sep 27, 2021 27 Sep 2021 at 12:00pm Revisiting the influence of Fe excess in the synthesis of${\mathrm{BaFe}}_{2}{\mathrm{S}}_{3}$by M. L. Amigó, Q. Stahl, A. Maljuk, A. U. B. Wolter, C. Hess, J. Geck, S. Wurmehl, S. Seiro, and B. Büchner Author(s): M. L. Amigó, Q. Stahl, A. Maljuk, A. U. B. Wolter, C. Hess, J. Geck, S. Wurmehl, S. Seiro, and B. Büchner${\mathrm{BaFe}}_{2}{\mathrm{S}}_{3}$is a quasi-one-dimensional antiferromagnetic insulator that becomes superconducting under hydrostatic pressure. The magnetic ordering temperature${T}_{N}$, as well as the presence of superconductivity have been found to be sample dependent. It has been argued t... [Phys. Rev. Materials 5, 094801] Published Fri Sep 10, 2021 10 Sep 2021 at 12:00pm Tin-pest problem as a test of density functionals using high-throughput calculations by Michael J. Mehl, Mateo Ronquillo, David Hicks, Marco Esters, Corey Oses, Rico Friedrich, Andriy Smolyanyuk, Eric Gossett, Daniel Finkenstadt, and Stefano Curtarolo Author(s): Michael J. Mehl, Mateo Ronquillo, David Hicks, Marco Esters, Corey Oses, Rico Friedrich, Andriy Smolyanyuk, Eric Gossett, Daniel Finkenstadt, and Stefano Curtarolo At ambient pressure tin transforms from its ground state, the semimetal$α$-Sn (diamond structure), to metallic$β$-Sn at$13{\phantom{\rule{0.16em}{0ex}}}^{∘}\mathrm{C}$(286 K). There may be a further transition to a simple hexagonal phase,$γ$-Sn, above 450 K. These relatively low transition temp... [Phys. Rev. Materials 5, 083608] Published Mon Aug 30, 2021 30 Aug 2021 at 12:00pm Unconventional iron-magnesium compounds at terapascal pressures by Yimei Fang, Yang Sun, Renhai Wang, Feng Zheng, Shunqing Wu, Cai-Zhuang Wang, Renata M. Wentzcovitch, and Kai-Ming Ho Author(s): Yimei Fang, Yang Sun, Renhai Wang, Feng Zheng, Shunqing Wu, Cai-Zhuang Wang, Renata M. Wentzcovitch, and Kai-Ming Ho Being a lithophile element at ambient pressure, magnesium has been long believed to be immiscible with iron. Authors of a recent study showed that pressure turns magnesium into a siderophile element and can produce unconventional Fe-Mg compounds [Gao et al., New J. Chem. 43, 17403 (2019)]. Here, we... [Phys. Rev. B 104, 144109] Published Tue Oct 26, 2021 26 Oct 2021 at 12:00pm Superconducting and structural properties of the type-I superconductor${\mathrm{PdTe}}_{2}$under high pressure by Yusaku Furue, Tadachika Fujino, Marc V. Salis, Huaqian Leng, Fumihiro Ishikawa, Takashi Naka, Satoshi Nakano, Yingkai Huang, Anne de Visser, and Ayako Ohmura Author(s): Yusaku Furue, Tadachika Fujino, Marc V. Salis, Huaqian Leng, Fumihiro Ishikawa, Takashi Naka, Satoshi Nakano, Yingkai Huang, Anne de Visser, and Ayako Ohmura The transition metal dichalcogenide$\mathrm{Pd}{\mathrm{Te}}_{2}$has attractive features based on its classification as a type-II Dirac semimetal and the occurrence of type-I superconductivity, providing a platform for discussion of a topological superconductor. Our recent work revealed that type-... [Phys. Rev. B 104, 144510] Published Mon Oct 25, 2021 25 Oct 2021 at 12:00pm Interplay of magnetism and dimerization in the pressurized Kitaev material$β\text{−}{\mathrm{Li}}_{2}{\mathrm{IrO}}_{3}$by Bin Shen, Anton Jesche, Maximilian L. Seidler, Friedrich Freund, Philipp Gegenwart, and Alexander A. Tsirlin Author(s): Bin Shen, Anton Jesche, Maximilian L. Seidler, Friedrich Freund, Philipp Gegenwart, and Alexander A. Tsirlin We present magnetization measurements on polycrystalline$β\text{−}{\mathrm{Li}}_{2}{\mathrm{IrO}}_{3}\$ under hydrostatic pressures up to 3 GPa and construct the temperature-pressure phase diagram of this material. Our data confirm that magnetic order breaks down in a first-order phase transition at...

[Phys. Rev. B 104, 134426] Published Fri Oct 22, 2021
22 Oct 2021 at 12:00pm
Continuous measurement of ultrasonic elastic wave velocities, X-ray radiography and X-ray diffraction of Zr50Cu40Al10 metallic glass at high pressure and high temperature conditions
by Yoshio Kono
Volume 41, Issue 3, September 2021, Page 219-232
.

21 Jun 2021 at 8:59am
Elastic properties of Mg-phase D at high pressure
by Chaowen Xu
Volume 41, Issue 3, September 2021, Page 233-246
.

26 Jul 2021 at 2:45pm
High pressure stability of β-Zr: no evidence for isostructural phase transitions
by E. F. O’Bannon
Volume 41, Issue 3, September 2021, Page 247-266
.

30 Jul 2021 at 8:30am
Phase transitions of ScOOH under high pressure
by Yoshiaki Ito
Volume 41, Issue 3, September 2021, Page 275-289
.

14 Aug 2021 at 3:57am
Optimisation of toroidal ZTA anvils and gaskets; towards improved load and pressure performance
by N. P. Funnell
Volume 41, Issue 3, September 2021, Page 306-317
.

30 Aug 2021 at 6:10am
Pressure-induced structural phase transition in corundum-related class Cu3TeO6
by Jia Qu
Volume 41, Issue 3, September 2021, Page 318-327
.

7 Sep 2021 at 7:39am
Inhibitory effect of high hydrostatic pressure, nisin, and moderate heating on the inactivation of Paenibacillus sp. and Terribacillus aidingensis spores isolated from UHT milk
by Souhir Kmiha
Volume 41, Issue 3, September 2021, Page 328-340
.

1 Jul 2021 at 1:08pm
Chilled storage stability of spice marinated and high pressure processed Indian white prawns (Fenneropenaeus indicus)
by Ginson Joseph
Volume 41, Issue 3, September 2021, Page 341-351
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31 Jul 2021 at 2:34pm
Vacuum impregnation of apple assisted by high hydrostatic pressure
by Ming Gao
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7 Oct 2021 at 2:34pm