Disappearance of the quantum spin liquid state in dimer-Mott insulators by disorder

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K05747
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: University of Yamanashi
• Principal Investigator: YONEYAMA Naoki 山梨大学, 大学院総合研究部, 教授 (80312643)
• Research Collaborator: ENOMOTO Masaya ; ASHIZAWA Norihiro ; NISHIMURA Yuma
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 量子スピン液体 / ダイマーモット絶縁体 / 真性モット絶縁体 / 化学圧力

Outline of Final Research Achievements

Quantum spin liquid (QSL) is a fluid-like state of magnetic spins fluctuating down to low temperatures, which is remarkable for the application to micro storage medium. It has been known that the QSL state is realized in an organic crystal. By means of the resistivity measurement under pressure, we have clarified the mechanism of the destruction of the QSL state by introducing impurity.

Free Research Field

物性化学

Academic Significance and Societal Importance of the Research Achievements

本研究では，不純物分子による量子スピン液体状態の壊れ方が不純物分子の大きさによって異なることを検証した．母体結晶中の有機分子よりも小さい分子を不純物としたときは結晶中の“乱れ”によって，逆に大きい分子の場合は結晶内部に“実効的な圧力”が加わった状態になることで，量子スピン液体状態が壊れてしまう．このことは量子スピン液体状態を制御・応用するための将来的指針となると思われる．