Orbital-Order Driven Ferroelectricity and Dipolar Relaxation Dynamics in Multiferroic GaMo<sub>4</sub>S<sub>8</sub>

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APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session C06: Electronic States in S and Te Chalcogenides

2:30 PM–4:54 PM, Monday, March 4, 2019
BCEC Room: 109A

Sponsoring Unit: DCMP
Chair: Rico Schoenemann, National High Magnetic Field Laboratory

Abstract: C06.00004 : Orbital-Order Driven Ferroelectricity and Dipolar Relaxation Dynamics in Multiferroic GaMo₄S₈

3:06 PM–3:18 PM

Abstract

Presenter:

Korbinian Geirhos
(Experimental Physics V, Center for Electronic Correlations and Magnetism, Universitiy of Augsburg)

Authors:

Korbinian Geirhos
(Experimental Physics V, Center for Electronic Correlations and Magnetism, Universitiy of Augsburg)

Stephan Krohns
(Experimental Physics V, Center for Electronic Correlations and Magnetism, Universitiy of Augsburg)

Hiroyuki Nakamura
(Department of Materials Science and Engineering, Kyoto University)

Takeshi Waki
(Department of Materials Science and Engineering, Kyoto University)

Yoshikazu Tabata
(Department of Materials Science and Engineering, Kyoto University)

István Kézsmárki
(Experimental Physics V, Center for Electronic Correlations and Magnetism, Universitiy of Augsburg)

Peter Lunkenheimer
(Experimental Physics V, Center for Electronic Correlations and Magnetism, Universitiy of Augsburg)

GaMo₄S₈, a compound of the lacunar spinel family, was recently shown to exhibit non-canonical, orbitally-driven ferroelectricity [1]. Our dielectric spectroscopy measurements on this multiferroic material reveal complex relaxation dynamics, above as well as below its Jahn-Teller transition at TJT= 47 K [2]. Above the Jahn-Teller transition, two types of coupled dipolar-orbital dynamics were found: On the one hand, relaxations within cluster-like regions with short-range polar order, as known from relaxor ferroelectrics. On the other hand, critical fluctuations of only weakly interacting dipoles, resembling the typical dynamics of order-disorder type ferroelectrics. Below TJT, the system is driven into long range ferrolectric order by the onset of orbital order and dipolar dynamics within the ferroelectric domains is observed: The found marked differences to the skyrmion host GaV₄S₈ seem to be related to the different structural distortions in these systems.
[1] E. Neuber, et al., J. Phys.: Condens. Matter 30, 445402 (2018)
[2] K. Geirhos, et al., arXiv:1810.07145

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Bulletin of the American Physical Society

APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session C06: Electronic States in S and Te Chalcogenides

Abstract: C06.00004 : Orbital-Order Driven Ferroelectricity and Dipolar Relaxation Dynamics in Multiferroic GaMo4S8

Presenter:

Authors:

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Abstract: C06.00004 : Orbital-Order Driven Ferroelectricity and Dipolar Relaxation Dynamics in Multiferroic GaMo₄S₈