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.

Singlet molecular oxygen regulates vascular tone and blood pressure in inflammation
by Christopher P. Stanley


Singlet molecular oxygen regulates vascular tone and blood pressure in inflammation

Singlet molecular oxygen regulates vascular tone and blood pressure in inflammation, Published online: 13 February 2019; doi:10.1038/s41586-019-0947-3

Singlet molecular oxygen, produced by indoleamine 2,3-dioxygenase 1 activity, gives rise to a signalling molecule that regulates arterial relaxation under inflammatory conditions.
13 Feb 2019 at 12:00am
Tuning superconductivity in twisted bilayer graphene
by Yankowitz, M., Chen, S., Polshyn, H., Zhang, Y., Watanabe, K., Taniguchi, T., Graf, D., Young, A. F., Dean, C. R.


Materials with flat electronic bands often exhibit exotic quantum phenomena owing to strong correlations. An isolated low-energy flat band can be induced in bilayer graphene by simply rotating the layers to 1.1°, resulting in the appearance of gate-tunable superconducting and correlated insulating phases. Here, we demonstrate that in addition to the twist angle, the interlayer coupling can be varied to precisely tune these phases. We induce superconductivity at a twist angle larger than 1.1°—in which correlated phases are otherwise absent—by varying the interlayer spacing with hydrostatic pressure. Our low disorder devices reveal details about the superconducting phase diagram and its relationship to the nearby insulator. Our results demonstrate twisted bilayer graphene to be a uniquely tunable platform for exploring correlated states.


25 Jan 2019 at 7:37pm
Limits of multifunctionality in tunable networks [Physics]
by Jason W. Rocks, Henrik Ronellenfitsch, Andrea J. Liu, Sidney R. Nagel, Eleni Katifori
Nature is rife with networks that are functionally optimized to propagate inputs to perform specific tasks. Whether via genetic evolution or dynamic adaptation, many networks create functionality by locally tuning interactions between nodes. Here we explore this behavior in two contexts: strain propagation in mechanical networks and pressure redistribution in...
12 Feb 2019 at 6:46pm
Pressure Effects on the $4f$ Electronic Structure of Light Lanthanides
by W.-T. Chiu, D. R. Mortensen, M. J. Lipp, G. Resta, C. J. Jia, B. Moritz, T. P. Devereaux, S. Y. Savrasov, G. T. Seidler, and R. T. Scalettar
Author(s): W.-T. Chiu, D. R. Mortensen, M. J. Lipp, G. Resta, C. J. Jia, B. Moritz, T. P. Devereaux, S. Y. Savrasov, G. T. Seidler, and R. T. Scalettar


Using the satellite structure of the $L{γ}_{1}$ line in nonresonant x-ray emission spectra, we probe the high-pressure evolution of the bare $4f$ signature of the early light lanthanides at ambient temperature. For Ce and Pr the satellite peak experiences a sudden reduction concurrent with their res...


[Phys. Rev. Lett. 122, 066401] Published Wed Feb 13, 2019
13 Feb 2019 at 11:00am
Spin-Triplet $p$-Wave Superconductivity Revealed under High Pressure in ${\mathrm{UBe}}_{13}$
by Yusei Shimizu, Daniel Braithwaite, Dai Aoki, Bernard Salce, and Jean-Pascal Brison
Author(s): Yusei Shimizu, Daniel Braithwaite, Dai Aoki, Bernard Salce, and Jean-Pascal Brison


To unravel the nature of the superconducting symmetry of the enigmatic $5f$ heavy-fermion ${\mathrm{UBe}}_{13}$, the pressure dependence of the upper critical field and of the normal state are studied up to 10 GPa. Remarkably, the pressure evolution of the anomalous ${H}_{c2}(T,P)$ over the entire p...


[Phys. Rev. Lett. 122, 067001] Published Tue Feb 12, 2019
12 Feb 2019 at 11:00am
Hexagonal Layered Polymeric Nitrogen Phase Synthesized near 250 GPa
by D. Laniel, G. Geneste, G. Weck, M. Mezouar, and P. Loubeyre
Author(s): D. Laniel, G. Geneste, G. Weck, M. Mezouar, and P. Loubeyre


A new solid nitrogen structure of two-dimensional interconnected hexagons emerges at pressures of 180–250 GPa.


[Phys. Rev. Lett. 122, 066001] Published Mon Feb 11, 2019
11 Feb 2019 at 11:00am
Multithermal-Multibaric Molecular Simulations from a Variational Principle
by Pablo M. Piaggi and Michele Parrinello
Author(s): Pablo M. Piaggi and Michele Parrinello


We present a method for performing multithermal-multibaric molecular dynamics simulations that sample entire regions of the temperature-pressure (TP) phase diagram. The method uses a variational principle [Valsson and Parrinello, Phys. Rev. Lett. 113, 090601 (2014)] in order to construct a bias that...


[Phys. Rev. Lett. 122, 050601] Published Wed Feb 06, 2019
6 Feb 2019 at 11:00am
Persistent Octahedral Coordination in Amorphous ${\mathrm{GeO}}_{2}$ Up to 100 GPa by $\mathrm{K}{β}^{′′}$ X-Ray Emission Spectroscopy
by G. Spiekermann, M. Harder, K. Gilmore, P. Zalden, Ch. J. Sahle, S. Petitgirard, M. Wilke, N. Biedermann, C. Weis, W. Morgenroth, J. S. Tse, E. Kulik, N. Nishiyama, H. Yavaş, and C. Sternemann
Author(s): G. Spiekermann, M. Harder, K. Gilmore, P. Zalden, Ch. J. Sahle, S. Petitgirard, M. Wilke, N. Biedermann, C. Weis, W. Morgenroth, J. S. Tse, E. Kulik, N. Nishiyama, H. Yavaş, and C. Sternemann


X-ray emission spectra reveal that under pressure conditions of Earth’s lower mantle, the compaction mechanism in amorphous germanium dioxide on the atomic scale is similar to that of its crystalline form.


[Phys. Rev. X 9, 011025] Published Wed Feb 06, 2019
6 Feb 2019 at 11:00am
Multisite Exchange-Enhanced Barocaloric Response in ${\mathrm{Mn}}_{3}\mathrm{NiN}$
by David Boldrin, Eduardo Mendive-Tapia, Jan Zemen, Julie B. Staunton, Thomas Hansen, Araceli Aznar, Josep-Lluís Tamarit, Maria Barrio, Pol Lloveras, Jiyeob Kim, Xavier Moya, and Lesley F. Cohen
Author(s): David Boldrin, Eduardo Mendive-Tapia, Jan Zemen, Julie B. Staunton, Thomas Hansen, Araceli Aznar, Josep-Lluís Tamarit, Maria Barrio, Pol Lloveras, Jiyeob Kim, Xavier Moya, and Lesley F. Cohen


Experiments reveal that Mn3NiN has enormous ability to control heat flow when subjected to mechanical pressure, establishing the family of Mn-antiperovskite materials as promising tools for energy-efficient refrigeration.


[Phys. Rev. X 8, 041035] Published Wed Nov 28, 2018
28 Nov 2018 at 11:00am
Exploring the High-Pressure Materials Genome
by Maximilian Amsler, Vinay I. Hegde, Steven D. Jacobsen, and Chris Wolverton
Author(s): Maximilian Amsler, Vinay I. Hegde, Steven D. Jacobsen, and Chris Wolverton


A new framework for predicting materials behavior at high pressure combines computational approximations with extant materials data to provide a tool for discovering new materials and their properties under nonambient conditions.


[Phys. Rev. X 8, 041021] Published Fri Nov 09, 2018
9 Nov 2018 at 11:00am
Solids, liquids, and gases under high pressure
by Ho-Kwang Mao, Xiao-Jia Chen, Yang Ding, Bing Li, and Lin Wang
Author(s): Ho-Kwang Mao, Xiao-Jia Chen, Yang Ding, Bing Li, and Lin Wang


The effect of adding high pressure as a control parameter in solids, liquids, and gases expands opportunities to observe unexpected novel phenomena and understand matter in extreme environments. This review on high pressure science highlights subjects ranging from quantum criticality to Earth science. State-of-the-art experimental methods at megabar pressures are also discussed. The proliferation of pressure-induced phases illustrate promising new directions for this field of research.


[Rev. Mod. Phys. 90, 015007] Published Tue Mar 20, 2018
20 Mar 2018 at 11:00am
Colloquium: High pressure and road to room temperature superconductivity
by Lev P. Gor’kov and Vladimir Z. Kresin
Author(s): Lev P. Gor’kov and Vladimir Z. Kresin


Even after three decades of development, high-temperature superconductivity remains one of the most challenging theoretical and experimental areas in condensed matter physics. In this Colloquium some new discoveries in this area are reviewed and possible routes toward much higher transition temperatures are analyzed.


[Rev. Mod. Phys. 90, 011001] Published Tue Jan 09, 2018
9 Jan 2018 at 11:00am
Equations of state for supernovae and compact stars
by M. Oertel, M. Hempel, T. Klähn, and S. Typel
Author(s): M. Oertel, M. Hempel, T. Klähn, and S. Typel


What are the thermodynamic properties of matter at extreme densities, even exceeding nuclear matter density severely? How can we describe the composition of matter for such conditions, the resulting pressure, and the maximum mass of cold neutron stars? How is this affected by finite temperatures, as they occur in core collapse supernovae and in compact star mergers? This review addresses these points within the framework of constraints from experiments as well as astronomical observations.


[Rev. Mod. Phys. 89, 015007] Published Wed Mar 15, 2017
15 Mar 2017 at 11:00am
Raman spectroscopy evidence for dimerization and Mott collapse in $α\text{−}{\mathrm{RuCl}}_{3}$ under pressures
by Gaomin Li, Xiaobin Chen, Yuan Gan, Fenglei Li, Mingqi Yan, Fan Ye, Shenghai Pei, Yujun Zhang, Le Wang, Huimin Su, Junfeng Dai, Yuanzhen Chen, Youguo Shi, XinWei Wang, Liyuan Zhang, Shanmin Wang, Dapeng Yu, Fei Ye, Jia-Wei Mei, and Mingyuan Huang
Author(s): Gaomin Li, Xiaobin Chen, Yuan Gan, Fenglei Li, Mingqi Yan, Fan Ye, Shenghai Pei, Yujun Zhang, Le Wang, Huimin Su, Junfeng Dai, Yuanzhen Chen, Youguo Shi, XinWei Wang, Liyuan Zhang, Shanmin Wang, Dapeng Yu, Fei Ye, Jia-Wei Mei, and Mingyuan Huang


We perform Raman spectroscopy studies on $α\text{−}{\mathrm{RuCl}}_{3}$ at room temperature to investigate its phase transitions of magnetism and structure under pressure. The Raman measurements resolve two critical pressures at ${p}_{1}=1.1$ GPa and ${p}_{2}=1.7$ GPa with very different structural ...


[Phys. Rev. Materials 3, 023601] Published Fri Feb 08, 2019
8 Feb 2019 at 11:00am
Strong electronic correlations and Fermi surface reconstruction in the quasi-one-dimensional iron superconductor ${\mathrm{BaFe}}_{2}{\mathrm{S}}_{3}$
by J. M. Pizarro and E. Bascones
Author(s): J. M. Pizarro and E. Bascones


${\mathrm{BaFe}}_{2}{\mathrm{S}}_{3}$ is a special iron superconductor with a two-leg ladder structure, which can help to unravel the role played by the electronic correlations in high-${T}_{c}$ superconductivity. At zero pressure, it is insulating with stripe antiferromagnetic (AF) order and it has...


[Phys. Rev. Materials 3, 014801] Published Thu Jan 31, 2019
31 Jan 2019 at 11:00am
Prediction of pressure-induced stabilization of noble-gas-atom compounds with alkali oxides and alkali sulfides
by Hao Gao, Jian Sun, Chris J. Pickard, and Richard J. Needs
Author(s): Hao Gao, Jian Sun, Chris J. Pickard, and Richard J. Needs


The cubic antifluorite structure comprises a fcc sublattice of anions with cations on the tetrahedral sites. The voids in the antifluorite structure that are crucial for superionicity in ${\mathrm{Li}}_{2}\mathrm{O}$ might also act as atomic traps. Trapping of guest atoms and small molecules within ...


[Phys. Rev. Materials 3, 015002] Published Thu Jan 17, 2019
17 Jan 2019 at 11:00am
Anchoring effect of distorted octahedra on the stability and strength of platinum metal pernitrides
by Z. H. Fu, T. G. Bi, S. H. Zhang, S. Chen, E. Zurek, D. Legut, T. C. Germann, T. Lookman, and R. F. Zhang
Author(s): Z. H. Fu, T. G. Bi, S. H. Zhang, S. Chen, E. Zurek, D. Legut, T. C. Germann, T. Lookman, and R. F. Zhang


The successful preparation of platinum metal pernitrides ($\mathrm{Pm}{\mathrm{N}}_{2}$) in high-temperature and high-pressure experiments has aroused great scientific interest, since it has long been thought that these systems could not be prepared, and also because of their intriguing mechanical p...


[Phys. Rev. Materials 3, 013603] Published Tue Jan 08, 2019
8 Jan 2019 at 11:00am
Achieving accurate energetics beyond (semi-)local density functional theory: Illustrated with transition metal disulfides, ${\mathrm{Cu}}_{2}{\mathrm{ZnSnS}}_{4}$, and ${\mathrm{Na}}_{3}{\mathrm{PS}}_{4}$ related semiconductors
by Shun-Li Shang, Yi Wang, Timothy J. Anderson, and Zi-Kui Liu
Author(s): Shun-Li Shang, Yi Wang, Timothy J. Anderson, and Zi-Kui Liu


Understanding, designing, and processing functional metal sulfides are significant challenges in part because of the high temperatures and pressures and the number of secondary phases encountered in these complex systems. In particular, the underlying thermochemical properties are not well understoo...


[Phys. Rev. Materials 3, 015401] Published Wed Jan 02, 2019
2 Jan 2019 at 11:00am