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.

The fight to manufacture COVID vaccines in lower-income countries
by Amy Maxmen

Nature, Published online: 16 September 2021; doi:10.1038/d41586-021-02383-z

Drug companies and wealthy countries are facing increased pressure to partner with firms in the global south but are reluctant to relinquish control.
16 Sep 2021 at 12:00am

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Blood pressure, executive function, and network connectivity in middle-aged adults at risk of dementia in late life [Psychological and Cognitive Sciences]
by Lisanne M. Jenkins, Alexandr Kogan, Matthew Malinab, Carson Ingo, Sanaz Sedaghat, Nick R. Bryan, Kristine Yaffe, Todd B. Parrish, Alexander J. Nemeth, Donald M. Lloyd-Jones, Lenore J. Launer, Lei Wang, Farzaneh Sorond
Midlife blood pressure is associated with structural brain changes, cognitive decline, and dementia in late life. However, the relationship between early adulthood blood pressure exposure, brain structure and function, and cognitive performance in midlife is not known. A better understanding of these relationships in the preclinical stage may advance our...
7 Sep 2021 at 8:58pm
Segregation on the nanoscale coupled to liquid water polyamorphism in supercooled aqueous ionic-liquid solution
by Laura Zanetti-Polzi
The Journal of Chemical Physics, Volume 155, Issue 10, September 2021.
The most intriguing hypothesis explaining many water anomalies is a metastable liquid–liquid phase transition (LLPT) at high pressure and low temperatures, experimentally hidden by homogeneous nucleation. Recent infrared spectroscopic experiments showed that upon addition of hydrazinium trifluoroacetate to water, the supercooled ionic solution undergoes a sharp, reversible LLPT at ambient pressure, possible offspring of that in pure water. Here, we calculate the temperature-dependent signature of the OH-stretching band, reporting on the low/high density phase of water, in neat water and in the same experimentally investigated ionic solution. The comparison between the infrared signature of the pure liquid and that of the ionic solution can be achieved only computationally, providing insight into the nature of the experimentally observed phase transition and allowing us to investigate the effects of ionic compounds on the high to low density supercooled liquid water transition. We show that the experimentally observed crossover behavior in the ionic solution can be reproduced only if the phase transition between the low- and high-density liquid states of water is coupled to a mixing–unmixing transition between the water component and the ions: at low temperatures, water and ions are separated and the water component is a low density liquid. At high temperatures, water and ions get mixed and the water component is a high-density liquid. The separation at low temperatures into ion-rich and ion-poor regions allows unveiling the polyamorphic nature of liquid water, leading to a crossover behavior resembling that observed in supercooled neat water under high pressure.
8 Sep 2021 at 2:27pm
Superconducting Phase Induced by a Local Structure Transition in Amorphous ${\mathrm{Sb}}_{2}{\mathrm{Se}}_{3}$ under High Pressure
by Kai Zhang, Ming Xu, Nana Li, Meng Xu, Qian Zhang, Eran Greenberg, Vitali B. Prakapenka, Yu-Sheng Chen, Matthias Wuttig, Ho-Kwang Mao, and Wenge Yang
Author(s): Kai Zhang, Ming Xu, Nana Li, Meng Xu, Qian Zhang, Eran Greenberg, Vitali B. Prakapenka, Yu-Sheng Chen, Matthias Wuttig, Ho-Kwang Mao, and Wenge Yang

Superconductivity and Anderson localization represent two extreme cases of electronic behavior in solids. Surprisingly, these two competing scenarios can occur in the same quantum system, e.g., in an amorphous superconductor. Although the disorder-driven quantum phase transition has attracted much a...

[Phys. Rev. Lett. 127, 127002] Published Wed Sep 15, 2021
15 Sep 2021 at 12:00pm
Equilibration of the Quark-Gluon Plasma at Finite Net-Baryon Density in QCD Kinetic Theory
by Xiaojian Du and Sören Schlichting
Author(s): Xiaojian Du and Sören Schlichting

We explore the out-of-equilibrium dynamics of the quark-gluon plasma at zero and finite net-baryon density based on an effective kinetic theory of quantum chromodynamics (QCD). By investigating the isotropization of the longitudinal pressure, we determine the relevant time and temperature scales for...

[Phys. Rev. Lett. 127, 122301] Published Tue Sep 14, 2021
14 Sep 2021 at 12:00pm
Probing Strong-Field QED with Doppler-Boosted Petawatt-Class Lasers
by L. Fedeli, A. Sainte-Marie, N. Zaim, M. Thévenet, J. L. Vay, A. Myers, F. Quéré, and H. Vincenti
Author(s): L. Fedeli, A. Sainte-Marie, N. Zaim, M. Thévenet, J. L. Vay, A. Myers, F. Quéré, and H. Vincenti

We propose a scheme to explore regimes of strong-field quantum electrodynamics (SF QED) otherwise unattainable with the currently available laser technology. The scheme relies on relativistic plasma mirrors curved by radiation pressure to boost the intensity of petawatt-class laser pulses by Doppler...

[Phys. Rev. Lett. 127, 114801] Published Fri Sep 10, 2021
10 Sep 2021 at 12:00pm
High-Temperature Superconducting Phases in Cerium Superhydride with a ${T}_{c}$ up to 115 K below a Pressure of 1 Megabar
by Wuhao Chen, Dmitrii V. Semenok, Xiaoli Huang, Haiyun Shu, Xin Li, Defang Duan, Tian Cui, and Artem R. Oganov
Author(s): Wuhao Chen, Dmitrii V. Semenok, Xiaoli Huang, Haiyun Shu, Xin Li, Defang Duan, Tian Cui, and Artem R. Oganov

The discoveries of high-temperature superconductivity in ${\mathrm{H}}_{3}\mathrm{S}$ and ${\mathrm{LaH}}_{10}$ have excited the search for superconductivity in compressed hydrides, finally leading to the first discovery of a room-temperature superconductor in a carbonaceous sulfur hydride. In contr...

[Phys. Rev. Lett. 127, 117001] Published Thu Sep 09, 2021
9 Sep 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
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
Role of higher-order effects in spin-misalignment small-angle neutron scattering of high-pressure torsion nickel
by Y. Oba, M. Bersweiler, I. Titov, N. Adachi, Y. Todaka, E. P. Gilbert, N.-J. Steinke, K. L. Metlov, and A. Michels
Author(s): Y. Oba, M. Bersweiler, I. Titov, N. Adachi, Y. Todaka, E. P. Gilbert, N.-J. Steinke, K. L. Metlov, and A. Michels

Magnetic field dependent unpolarized small-angle neutron scattering (SANS) experiments demonstrate that high-pressure torsion (HPT) straining induces spin misalignments in pure Ni, which persist in magnetic fields up to 4 T. The spin-misalignment scattering patterns are elongated perpendicular to th...

[Phys. Rev. Materials 5, 084410] Published Tue Aug 24, 2021
24 Aug 2021 at 12:00pm
Pressure-induced anomalies in the magnetic transitions of the exotic multiferroic material ${\mathrm{Tb}}_{2}{\mathrm{BaNiO}}_{5}$
by K. K. Iyer, Ram Kumar, S. Rayaprol, K. Maiti, and E. V. Sampathkumaran
Author(s): K. K. Iyer, Ram Kumar, S. Rayaprol, K. Maiti, and E. V. Sampathkumaran

We have studied the influence of external pressure up to 1 GPa on the magnetic transitions of the orthorhombic Haldane-spin chain compound ${\mathrm{Tb}}_{2}{\mathrm{BaNiO}}_{5}$, an exotic multiferroic material. This parent compound is known to undergo Néel ordering at ${T}_{N1}=63\phantom{\rule{0.... [Phys. Rev. Materials 5, 084401] Published Thu Aug 05, 2021 5 Aug 2021 at 12:00pm Pressure dependence of the superconducting and magnetic transition temperatures in${\mathrm{Sr}}_{2}{\mathrm{VO}}_{3}\mathrm{FeAs}$by S. Holenstein, F. Hummel, Z. Guguchia, S. Kamusella, N. Barbero, H. Ogino, Z. Shermadini, R. Khasanov, A. Amato, T. Shiroka, H.-H. Klauss, E. Morenzoni, D. Johrendt, and H. Luetkens Author(s): S. Holenstein, F. Hummel, Z. Guguchia, S. Kamusella, N. Barbero, H. Ogino, Z. Shermadini, R. Khasanov, A. Amato, T. Shiroka, H.-H. Klauss, E. Morenzoni, D. Johrendt, and H. Luetkens We report muon spin rotation$(μ\mathrm{S}\mathrm{R})$and magnetization measurements on superconducting${\mathrm{Sr}}_{2}{\mathrm{VO}}_{3}\mathrm{Fe}\mathrm{As}$under pressure. At ambient pressure,${\mathrm{Sr}}_{2}{\mathrm{VO}}_{3}\mathrm{Fe}\mathrm{As}$undergoes an antiferromagnetic transitio... [Phys. Rev. B 104, 104507] Published Thu Sep 16, 2021 16 Sep 2021 at 12:00pm Magnetic states of the quasi-one-dimensional iron chalcogenide${\mathrm{Ba}}_{2}{\mathrm{FeS}}_{3}$by Yang Zhang, Ling-Fang Lin, Gonzalo Alvarez, Adriana Moreo, and Elbio Dagotto Author(s): Yang Zhang, Ling-Fang Lin, Gonzalo Alvarez, Adriana Moreo, and Elbio Dagotto Quasi-one-dimensional iron-based ladders and chains, with the$3d$iron electronic density$n=6$, are attracting considerable attention. Recently, a new iron chain system${\mathrm{Ba}}_{2}{\mathrm{FeS}}_{3}$, also with$n=6$, was prepared under high-pressure and high-temperature conditions. Here th... [Phys. Rev. B 104, 125122] Published Wed Sep 15, 2021 15 Sep 2021 at 12:00pm Phonon-mediated high-temperature superconductivity in the ternary borohydride${\mathrm{KB}}_{2}{\mathrm{H}}_{8}$under pressure near 12 GPa by Miao Gao, Xun-Wang Yan, Zhong-Yi Lu, and Tao Xiang Author(s): Miao Gao, Xun-Wang Yan, Zhong-Yi Lu, and Tao Xiang The discovery of high-temperature superconductivity in hydrogen-rich compounds has fueled the enthusiasm for finding materials with more promising superconducting properties among hydrides. However, the ultrahigh pressure needed to synthesize and maintain high-temperature hydrogen-rich superconducto... [Phys. Rev. B 104, L100504] Published Tue Sep 14, 2021 14 Sep 2021 at 12:00pm Positive and negative chemical pressure effects investigated in electron-doped FeSe films with an electric-double-layer structure by N. Shikama, Y. Sakishita, F. Nabeshima, and A. Maeda Author(s): N. Shikama, Y. Sakishita, F. Nabeshima, and A. Maeda We investigated chemical pressure effects in electron-doped (e-doped) FeSe by fabricating an electric-double-layer structure with single-crystalline FeSe films on${\mathrm{LaAlO}}_{3}\$ with Se substituted by isovalent Te and S. Our method enables transport measurements of e-doped FeSe. Electron dop...

[Phys. Rev. B 104, 094512] Published Mon Sep 13, 2021
13 Sep 2021 at 12:00pm
Free energies of iron phases at high pressure and temperature: Molecular dynamics study
by Anatoly B. Belonoshko, Jie Fu, and Grigory Smirnov
Author(s): Anatoly B. Belonoshko, Jie Fu, and Grigory Smirnov

The crystal structure of iron, the major component of the Earth's inner core (IC), is unknown under the IC high pressure (P) (3.3–3.6 Mbar) and temperature (T) (5000–7000 K). Experimental and theoretical data on the phase diagram of iron at these extreme PT conditions are contradictory. Applying qua...

[Phys. Rev. B 104, 104103] Published Thu Sep 09, 2021
9 Sep 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
.

31 Jul 2021 at 2:34pm