Thermodynamics of a Bad Metal-Mott Insulator Transition in the Presence of Frustration
Thermodynamics of a Bad Metal-Mott Insulator Transition in the Presence of Frustration
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DOI：
10.1103/physrevlett.110.206402
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发表时间：
2013-05-14
影响因子：
8.6
通讯作者：
McKenzie, Ross H.
中科院分区：
文献类型：
--
作者：
Kokalj, J.;McKenzie, Ross H.
采用有限温度Lanczos 方法计算了半填充时各向异性三角晶格的Hubbard 模型的热力学性质。电荷敏感性表现出莫特金属-绝缘体转变的清晰特征。金属相的特点是电荷磁化率小、熵大、重正化准粒子质量大、自旋磁化率大。金属相中的脉动局部磁矩很大，与绝缘相中的脉动磁矩相当。这些不良的金属特性发生在相对较低的相干温度之上，如有机电荷转移盐中所见。
Thermodynamic properties of the Hubbard model on the anisotropic triangular lattice at half filling are calculated by the finite-temperature Lanczos method. The charge susceptibility exhibits clear signatures of a Mott metal-insulator transition. The metallic phase is characterized by a small charge susceptibility, large entropy, large renormalized quasiparticle mass, and large spin susceptibility. The fluctuating local magnetic moment in the metallic phase is large and comparable to that in the insulating phase. These bad metallic characteristics occur above a relatively low coherence temperature, as seen in organic charge transfer salts.