Thermodynamic study of anisotropic excitation stracture and quantum critical behavior on quantum spin liquid

2015 Fiscal Year Final Research Report

• Project/Area Number: 24740252
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: Osaka University
• Principal Investigator: Yamashita Satoshi 大阪大学, 理学(系)研究科(研究院), 助教 (40587466)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 量子スピン液体 / 分子性導体 / 熱測定 / 強相関

Outline of Final Research Achievements

Quantum spin liquid(QSL) with gap-less excitation was observed in dithiolene complex EtMe3Sb[Pd(dmit)2]2. In order to distinguish whether the gap-less behavior is one kind of critical behavior or a character of “QSL phase”, we have performed systematic heat capacity measurements for caion mixed solid solution system of XY[Pd(dmit)2]2. From the measurements for QSL+Antiferromangetic(AF) system, QSL+Charge order(CO) System, we found that the g values in heat capacity were slightly decrease with increasing AF content and slightly increase with increase CO content. This behavior was reproduced in AF+CO system. We confirmed the gap-less character is originated from the QSL phase. The critical like behavior was also observed on QSL-AF phase boundary.

Free Research Field

熱測定，磁性，分子性導体