Thermal-transport study of spin excitations in quantum spin liquid state

量子自旋液态自旋激发的热传输研究

• 批准号: 22740224
• 负责人: YAMASHITA Minoru
• 金额: $ 2.75万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2010
• 资助国家: 日本
• 起止时间: 2010 至 2011
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-22740224/
• 关键词: 磁性; 低温動性; 幾何学的フラストレーション; 低温物性

Quantum spin liquids(QSLs) are fluid-like states of quantum spins where its long-range ordered state is destroyed by quantum fluctuations. The ground state of QSL and its exotic phenomena, which have been extensively discussed for decades, have yet to be identified. We employ thermal transport measurements on newly discovered QSL candidates, and find a sizable linear temperature dependence of thermal conductivity in the zero-temperature limit, showing gapless excitation with a long mean free path(~ 1, 000 lattice distances). Such a long mean free path demonstrates a novel feature of QSL as a quantum-condensed state with long-distance coherence.

量子自旋液体（QSL）是量子自旋的类流体状态，其长程有序状态被量子涨落破坏。QSL的基态和它的奇异现象，已经被广泛讨论了几十年，还没有被确定。我们采用新发现的QSL候选人的热输运测量，并找到了一个相当大的线性温度依赖性的热导率在零温度极限，显示出长的平均自由程（~ 1000晶格距离）的无隙激发。如此长的平均自由程展示了QSL作为具有长距离相干性的量子凝聚态的新特征。

项目成果

Nodal versus nodeless behaviors of the order parameters of LiFeP and LiFeAs superconductors from magnetic penetration-depth measurements.

• DOI: 10.1103/physrevlett.108.047003
• 发表时间: 2011-07
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: K. Hashimoto;S. Kasahara;R. Katsumata;Y. Mizukami;M. Yamashita;H. Ikeda;T. Terashima;A. Carrington-A.-Ca

(Bal-xKx)Fe2 As2純良単結晶における熱伝導率測定

(Bal-xKx)Fe2 As2 纯单晶热导率测量

• 发表时间: 2012
• 作者: 大成誠一郎;紺谷浩;山下卓也
• 通讯作者: 山下卓也

Thermal-Transport Studies on Two-Dimensional Quantum Spin Liquids

二维量子自旋液体的热传输研究

• DOI: 10.1002/cphc.201100556
• 发表时间: 2012
• 期刊: Chem.Phys.Chem.
• 作者: M.Yamashita;T.Shibauchi;Y.Matsuda
• 通讯作者: Y.Matsuda

Science Interplay of Rotational, Relaxational, and Shear Dynamics in Solid He-4

固体 He-4 中旋转、松弛和剪切动力学的科学相互作用

• 发表时间: 2011
• 作者: E. J. Pratt;B. Hunt;V. Gadagkar;M. Yamashita;M. J. Graf;A. V. Balatsky;and J. C. Davis
• 通讯作者: and J. C. Davis

Bipartite Spin Excitations in a Two-Dimensional Quantum Spin-Liquid State of EtMe3Sb[Pd(dmit)2]

EtMe3Sb[Pd(dmit)2] 二维量子自旋液体态下的二分自旋激发

• 发表时间: 2011
• 作者: 大成誠一郎;紺谷浩;山下卓也;小林未知数;大成誠一郎;Michikazu Kobayashi;山下穣;小林未知数;山下穣;Michikazu Kobayashi;M. Kobayashi;小林未知数;渡邊大樹;Michikazu Kobayashi;渡邊大樹;小林未知数;山下穣
• 通讯作者: 山下穣