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.

## 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.

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

Understand the real reasons reproducibility reform fails
by Nicole C. Nelson

Nature, Published online: 06 December 2021; doi:10.1038/d41586-021-03617-w

Lack of rigour is often blamed on pressure to publish. But ethnographers can find out what truly keeps science from upping its game.
6 Dec 2021 at 12:00am

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Nearly Room-Temperature Ferromagnetism in a Pressure-Induced Correlated Metallic State of the van der Waals Insulator ${\mathrm{CrGeTe}}_{3}$
by Dilip Bhoi, Jun Gouchi, Naoka Hiraoka, Yufeng Zhang, Norio Ogita, Takumi Hasegawa, Kentaro Kitagawa, Hidenori Takagi, Kee Hoon Kim, and Yoshiya Uwatoko
Author(s): Dilip Bhoi, Jun Gouchi, Naoka Hiraoka, Yufeng Zhang, Norio Ogita, Takumi Hasegawa, Kentaro Kitagawa, Hidenori Takagi, Kee Hoon Kim, and Yoshiya Uwatoko

A complex interplay of different energy scales involving Coulomb repulsion, spin-orbit coupling, and Hund’s coupling energy in 2D van der Waals (vdW) material produces a novel emerging physical state. For instance, ferromagnetism in vdW charge transfer insulator ${\mathrm{CrGeTe}}_{3}$ provides a pr...

[Phys. Rev. Lett. 127, 217203] Published Wed Nov 17, 2021
17 Nov 2021 at 11:00am
Role of rare earth sites and vacancies in the anomalous compression of modulated scheelite tungstates ${RE}_{2}$(${\mathrm{WO}}_{4}{)}_{3}$
by Nanci Prado Sabalisck, Gerardo Gil-de-Cos, Cristina González-Silgo, Candelaria Guzmán-Afonso, Víctor Lavín, Javier López-Solano, Isabel Teresa Martín-Mateos, Lourdes Mestres, Andrés Mujica, David Santamaría-Pérez, Manuel Eulalio Torres, and Xavier Vendrell
Author(s): Nanci Prado Sabalisck, Gerardo Gil-de-Cos, Cristina González-Silgo, Candelaria Guzmán-Afonso, Víctor Lavín, Javier López-Solano, Isabel Teresa Martín-Mateos, Lourdes Mestres, Andrés Mujica, David Santamaría-Pérez, Manuel Eulalio Torres, and Xavier Vendrell

X-ray powder diffraction experiments at high pressures combining conventional sources and synchrotron radiation, together with theoretical simulations have allowed us to study the anomalous compression of the entire α-${RE}_{2}$(${\mathrm{WO}}_{4}{)}_{3}$ ($\mathit{RE}$ = La-Ho) family with modulate...

[Phys. Rev. Materials 5, 123601] Published Fri Dec 03, 2021
3 Dec 2021 at 11:00am
Robust evidence for the stabilization of the premartensite phase in Ni-Mn-In magnetic shape memory alloys by chemical pressure
by Anupam K. Singh, Sanjay Singh, B. Dutta, K. K. Dubey, Boby Joseph, R. Rawat, and Dhananjai Pandey
Author(s): Anupam K. Singh, Sanjay Singh, B. Dutta, K. K. Dubey, Boby Joseph, R. Rawat, and Dhananjai Pandey

The thermodynamic stability of the premartensite (PM) phase has been a topic of extensive investigation in shape memory alloys as it affects the main martensite phase transition and the related physical properties. In general, the PM phase is stable over a rather narrow temperature-composition range...

[Phys. Rev. Materials 5, 113607] Published Tue Nov 30, 2021
30 Nov 2021 at 11:00am
Epitaxial growth of (100)-oriented SmN directly on (100)Si substrates
by J. F. McNulty, K. Temst, M. J. Van Bael, A. Vantomme, and E.-M. Anton
Author(s): J. F. McNulty, K. Temst, M. J. Van Bael, A. Vantomme, and E.-M. Anton

We demonstrate growth of epitaxial (100)SmN thin films directly on (100)Si surfaces. By using physical vapor deposition of Sm metal in an ${\mathrm{N}}_{2}$ atmosphere we show that careful control of substrate temperature, ${\mathrm{N}}_{2}$ pressure, and postannealing steps leads to epitaxial SmN w...

[Phys. Rev. Materials 5, 113404] Published Mon Nov 29, 2021
29 Nov 2021 at 11:00am
Stable polar oxynitrides through epitaxial strain
by Li Zhu, Hiroyuki Takenaka, and R. E. Cohen
Author(s): Li Zhu, Hiroyuki Takenaka, and R. E. Cohen

We investigate energetically favorable structures of $AB{\mathrm{O}}_{2}\mathrm{N}$ oxynitrides as functions of pressure and strain via swarm-intelligence-based structure prediction methods, density functional theory (DFT) lattice dynamics and first-principles molecular dynamics. We predict several ...

[Phys. Rev. Materials 5, 114404] Published Mon Nov 15, 2021
15 Nov 2021 at 11:00am
$\mathrm{Na}\mathrm{Zn}{\mathrm{F}}_{3}$ as a low-pressure analog of $\mathrm{Mg}\mathrm{Si}{\mathrm{O}}_{3}$
by Dominik Kurzydłowski, Arkadiusz Gajek, and Zoran Mazej
Author(s): Dominik Kurzydłowski, Arkadiusz Gajek, and Zoran Mazej

Solid-state systems whose properties at high pressure (exceeding 1 GPa) mimic those of $\mathrm{Mg}\mathrm{Si}{\mathrm{O}}_{3}$ are of large importance in the study of the interior of planets. By means of density functional theory (DFT) calculations we studied the high-pressure properties of a $\mat... [Phys. Rev. Materials 5, 113602] Published Wed Nov 03, 2021 3 Nov 2021 at 11:00am Pressure-induced structural phase transition and suppression of Jahn-Teller distortion in the quadruple perovskite structure by V. S. Bhadram, B. Joseph, D. Delmonte, E. Gilioli, B. Baptiste, Y. Le Godec, R. P. S. M. Lobo, and A. Gauzzi Author(s): V. S. Bhadram, B. Joseph, D. Delmonte, E. Gilioli, B. Baptiste, Y. Le Godec, R. P. S. M. Lobo, and A. Gauzzi By means of in situ synchrotron x-ray diffraction and Raman spectroscopy under hydrostatic pressure, we investigate the structural stability of the quadruple perovskite$\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$, 0.2, 0.3) alloys, through characterization in pulsed magnetic fields. We measured the adiabatic tem... [Phys. Rev. Materials 5, 104406] Published Wed Oct 13, 2021 13 Oct 2021 at 12:00pm Ab initio prediction of nontrivial topological band and superconductivity in stable metallic Si allotropes at ambient pressure by Yoon-Gu Kang, In-Ho Lee, Myung Joon Han, and Kee Joo Chang Author(s): Yoon-Gu Kang, In-Ho Lee, Myung Joon Han, and Kee Joo Chang Silicon is a semiconductor and widely used as the key element for modern electronic devices. Various metallic superconducting phases have been reported, but most retain their crystal structure at high pressures. Thus, it remains a challenge to search for potential superconducting Si allotropes. In this article, the authors propose novel metallic Si allotropes that meet the conditions for dynamic, mechanical, and thermal stability at ambient pressure through machine learning and first-principles electronic structure calculations. The new allotropes are superconductors and even exhibit a nontrivial band topology, providing a promising platform for realizing a topological superconducting state in all-Si systems. [Phys. Rev. Materials 5, 104802] Published Wed Oct 13, 2021 13 Oct 2021 at 12:00pm Automated free-energy calculation from atomistic simulations by Sarath Menon, Yury Lysogorskiy, Jutta Rogal, and Ralf Drautz Author(s): Sarath Menon, Yury Lysogorskiy, Jutta Rogal, and Ralf Drautz We devise automated workflows for the calculation of Helmholtz and Gibbs free energies and their temperature and pressure dependence and provide the corresponding computational tools. We employ nonequilibrium thermodynamics for evaluating the free energy of solid and liquid phases at a given tempera... [Phys. Rev. Materials 5, 103801] Published Mon Oct 11, 2021 11 Oct 2021 at 12:00pm Valence skipping, internal doping, and site-selective Mott transition in${\mathrm{PbCoO}}_{3}$under pressure by Atsushi Hariki, Kyo-Hoon Ahn, and Jan Kuneš Author(s): Atsushi Hariki, Kyo-Hoon Ahn, and Jan Kuneš We present a computational study of${\mathrm{PbCoO}}_{3}$at ambient and elevated pressure. We employ the static and dynamic treatment of local correlation in the form of density functional theory$+U(\mathrm{DFT}+U)$and$+$dynamical mean-field theory$(\mathrm{DFT}+\mathrm{DMFT})$. Our res... [Phys. Rev. B 104, 235101] Published Wed Dec 01, 2021 1 Dec 2021 at 11:00am Theory for doping trends in titanium oxypnictide superconductors by Han-Xiang Xu, Daniel Guterding, and Harald O. Jeschke Author(s): Han-Xiang Xu, Daniel Guterding, and Harald O. Jeschke A family of titanium oxypnictide materials$\mathrm{Ba}{\mathrm{Ti}}_{2}{Pn}_{2}\mathrm{O}$($Pn=\mathrm{pnictogen}$) becomes superconducting when a charge and/or spin-density wave is suppressed. With hole doping, isovalent doping and pressure, a whole range of tuning parameters is available. We inv... [Phys. Rev. B 104, 184519] Published Tue Nov 30, 2021 30 Nov 2021 at 11:00am Pressure-driven electronic and structural phase transition in intrinsic magnetic topological insulator$\mathrm{Mn}{\mathrm{Sb}}_{2}{\mathrm{Te}}_{4}$by Yunyu Yin, Xiaoli Ma, Dayu Yan, Changjiang Yi, Binbin Yue, Jianhong Dai, Lin Zhao, Xiaohui Yu, Youguo Shi, Jian-Tao Wang, and Fang Hong Author(s): Yunyu Yin, Xiaoli Ma, Dayu Yan, Changjiang Yi, Binbin Yue, Jianhong Dai, Lin Zhao, Xiaohui Yu, Youguo Shi, Jian-Tao Wang, and Fang Hong Intrinsic magnetic topological insulators provide an ideal platform to achieve various exciting physical phenomena. However, this kind of materials and related research are still very rare. In this work, we reported the electronic and structural phase transitions in the intrinsic magnetic topologica... [Phys. Rev. B 104, 174114] Published Mon Nov 29, 2021 29 Nov 2021 at 11:00am Electrical conductivity of Sn at high pressure and temperature by Ryan S. Crum, David A. Brantley, Vu Tran, Minta C. Akin, and Ricky Chau Author(s): Ryan S. Crum, David A. Brantley, Vu Tran, Minta C. Akin, and Ricky Chau To date, temperature and conductivity have many outstanding implications in extreme environments but are yet to be fully understood under high pressure and temperature dynamic conditions. Here, we introduce an approach to provide high quality electrical conductivity results under dynamic loading con... [Phys. Rev. B 104, 184117] Published Mon Nov 29, 2021 29 Nov 2021 at 11:00am From ferromagnetic to helical order with a discussion of the low-temperature antiferromagnetism in composite${\mathrm{Cd}}_{1–x}{\mathrm{Mn}}_{x}\mathrm{Ge}{\mathrm{P}}_{2}+\mathrm{MnP}\$ semiconductors
by L. Kilanski, S. Lewińska, A. Khaliq, R. Minikaev, A. Reszka, A. Ślawska-Waniewska, B. J. Kowalski, T. R. Arslanov, and S. F. Marenkin
Author(s): L. Kilanski, S. Lewińska, A. Khaliq, R. Minikaev, A. Reszka, A. Ślawska-Waniewska, B. J. Kowalski, T. R. Arslanov, and S. F. Marenkin

Mn-doped chalcopyrites exhibit rich and unique physical properties due to the presence of magnetic clusters, both at ambient and under high external pressures. Despite recent efforts and rich literature on this topic, it is still necessary to explain some of the phenomena occurring in these systems,...

[Phys. Rev. B 104, 184430] Published Mon Nov 29, 2021
29 Nov 2021 at 11:00am
Effect of hydrostatic pressure on magneto-crystalline anisotropy of Heusler Ni2MnSn-based alloy
by J. Kamarád
Volume 41, Issue 4, December 2021, Page 405-413
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11 Nov 2021 at 3:40am
Vacuum impregnation of apple assisted by high hydrostatic pressure
by Ming Gao
Volume 41, Issue 4, December 2021, Page 414-428
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7 Oct 2021 at 2:34pm