Polar and magnetic order in Ga V4 S e8

E. Ruff, A. Butykai, K. Geirhos, S. Widmann, V. Tsurkan, E. Stefanet, I. Kézsmárki, A. Loidl, P. Lunkenheimer

Research output: Contribution to journalArticle

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Abstract

In the present work, we provide results from specific heat, magnetic susceptibility, dielectric constant, ac conductivity, and electrical polarization measurements performed on the lacunar spinel GaV4Se8. With decreasing temperature, we observe a transition from the paraelectric and paramagnetic cubic state into a polar, probably ferroelectric state at 42 K followed by magnetic ordering at 18 K. The polar transition is likely driven by the Jahn-Teller effect due to the degeneracy of the V4 cluster orbitals. The excess polarization arising in the magnetic phase indicates considerable magnetoelectric coupling. Overall, the behavior of GaV4Se8 in many respects is similar to that of the skyrmion host GaV4S8, exhibiting a complex interplay of orbital, spin, lattice, and polar degrees of freedom. However, its dielectric behavior at the polar transition markedly differs from that of the Jahn-Teller-driven ferroelectric GeV4S8, which can be ascribed to the dissimilar electronic structure of the Ge compound.

Original languageEnglish
Article number165119
JournalPhysical Review B
Volume96
Issue number16
DOIs
Publication statusPublished - Oct 10 2017

Fingerprint

Ferroelectric materials
Polarization
Jahn-Teller effect
Electron transitions
Magnetic susceptibility
Specific heat
Electronic structure
orbitals
Magnetization
Permittivity
polarization
spinel
degrees of freedom
specific heat
permittivity
electronic structure
magnetic permeability
conductivity
Temperature
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Ruff, E., Butykai, A., Geirhos, K., Widmann, S., Tsurkan, V., Stefanet, E., ... Lunkenheimer, P. (2017). Polar and magnetic order in Ga V4 S e8. Physical Review B, 96(16), [165119]. https://doi.org/10.1103/PhysRevB.96.165119

Polar and magnetic order in Ga V4 S e8. / Ruff, E.; Butykai, A.; Geirhos, K.; Widmann, S.; Tsurkan, V.; Stefanet, E.; Kézsmárki, I.; Loidl, A.; Lunkenheimer, P.

In: Physical Review B, Vol. 96, No. 16, 165119, 10.10.2017.

Research output: Contribution to journalArticle

Ruff, E, Butykai, A, Geirhos, K, Widmann, S, Tsurkan, V, Stefanet, E, Kézsmárki, I, Loidl, A & Lunkenheimer, P 2017, 'Polar and magnetic order in Ga V4 S e8', Physical Review B, vol. 96, no. 16, 165119. https://doi.org/10.1103/PhysRevB.96.165119
Ruff E, Butykai A, Geirhos K, Widmann S, Tsurkan V, Stefanet E et al. Polar and magnetic order in Ga V4 S e8. Physical Review B. 2017 Oct 10;96(16). 165119. https://doi.org/10.1103/PhysRevB.96.165119
Ruff, E. ; Butykai, A. ; Geirhos, K. ; Widmann, S. ; Tsurkan, V. ; Stefanet, E. ; Kézsmárki, I. ; Loidl, A. ; Lunkenheimer, P. / Polar and magnetic order in Ga V4 S e8. In: Physical Review B. 2017 ; Vol. 96, No. 16.
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