TY - JOUR
T1 - Spin-driven ferroelectricity in the quantum magnet TlCuCl3 under high pressure
AU - Sakurai, Kyosuke
AU - Kimura, Shojiro
AU - Awaji, Staoshi
AU - Matsumoto, Masashige
AU - Tanaka, Hidekazu
N1 - Funding Information:
The authors are grateful to T. Sakurai and H. Okada for their advice on the high-pressure experiments, and to K. Okunshi for valuable discussions. This work was partly supported by Grants-in-Aid for Scientific Research (Grants No. 17H01142, No. 17H02917, No. 17K05516, and No. 19H01834) from MEXT Japan. This work was performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Project No. 17H0412).
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.102.064104
DO - 10.1103/PhysRevB.102.064104
M3 - Article
AN - SCOPUS:85090165397
SN - 2469-9950
VL - 102
JO - Physical Review B
JF - Physical Review B
IS - 6
M1 - 064104
ER -