Bulletin of the American Physical Society
APS March Meeting 2021
Volume 66, Number 1
Monday–Friday, March 15–19, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session X23: Materials at Static High Pressure
8:00 AM–10:48 AM,
Friday, March 19, 2021
Sponsoring
Unit:
GSCCM
Chair: Nathalie Vast, CEA-Saclay
Abstract: X23.00013 : Skyrmion host GaV4S8 under high pressure
10:24 AM–10:36 AM
Live
Presenter:
Yuejian Wang
(Oakland University)
Authors:
Yuejian Wang
(Oakland University)
Saqib Rahman
(Center for High Pressure Science and Technology Advanced Research)
Elaine Sun
(The University of Chicago)
Christopher Knill
(Oakland University)
Dongzhou Zhang
(The University of Hawaii at Manoa)
Lin Wang
(Yanshan University)
Vladimir Tsurkan
(University of Augsburg)
István Kézsmárki
(University of Augsburg)
Recently, GaV4S8, received global attention due to the whirl-like topological spins rotating along the radial direction discovered in this material. Previous investigations indicate the important role of the structure behind the multiferroicity. For example, the crystal structure transition coupling with a magnetic ordering at ~40 K. In the present work, we use compression to alter the structure and thus changing material’s properties to establish the interrelation between the structural, optical, and electrical properties for our better understanding this skyrmion host material. Upon this objective, in-situ high-pressure measurements of single crystal/powder X-ray diffraction, electrical conductivity, and Raman were carried out by using a diamond anvil cell. These multi-characterizations found and verified the structural transformation from cubic to orthorhombic along with a transition from semi-conductor to metallic material in GaM4X8. We also determined the bulk modulus of the two phases of GaM4X8 by fitting the data set of unit cell volumes against pressure with the second-order birth-Murnaghan equation of state, and attempted to explain the mechanisms of phase transitions by means of Jahn-teller effect and the anisotropic changes in bonding lengths during compression.
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