Spin-driven ferroelectricity in the quantum magnet TlCuCl3 under high pressure

Kyosuke Sakurai, Shojiro Kimura, Staoshi Awaji, Masashige Matsumoto, Hidekazu Tanaka

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In this study, dielectric constant and pyroelectric current measurements under high pressure up to 16.7 kbar have been performed for the interacting spin dimer system TlCuCl3, which exhibits spin-driven ferroelectricity in the magnon Bose-Einstein condensation (BEC) phase with strong quantum spin fluctuation. When pressure is applied, the magnon BEC phase becomes significantly stabilized, whereas the value of the electric polarization decreases in high-pressure regions. It is also observed that electric polarization becomes harder under pressure. Analyses based on both a Landau theory and a microscopic spin Hamiltonian demonstrate that the suppression of quantum fluctuation on the application of pressure caused the observed pressure effects. Consequently, it is revealed that the ferroelectricity in TlCuCl3 is highly governed by the quantum spin fluctuation.

Original languageEnglish
Article number064104
JournalPhysical Review B
Volume102
Issue number6
DOIs
Publication statusPublished - 2020 Aug 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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