Thermodynamics of the Spin Luttinger Liquid in a Model Ladder Material
Thermodynamics of the Spin Luttinger Liquid in a Model Ladder Material
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DOI：
10.1103/physrevlett.101.247202
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发表时间：
2008-12-12
影响因子：
8.6
通讯作者：
Kraemer, K. W.
中科院分区：
文献类型：
--
作者：
Rueegg, Ch.;Kiefer, K.;Kraemer, K. W.
通过比热和磁热效应的测量，研究了金属有机自旋梯形化合物(C(5)H(12)N)(2)CuBr(4)的温度和磁场相图。我们证明了在很宽的温度范围内，在两个场诱导量子临界点之间存在扩展的自旋Luttinger-Luttinger-Liquid相。基于理想的自旋阶梯哈密顿量，对阶梯比热进行了全面的数值模拟，得到了与整个相图实验数据很好的定量一致性。
The phase diagram in temperature and magnetic field of the metal-organic, two-leg, spin-ladder compound (C(5)H(12)N)(2)CuBr(4) is studied by measurements of the specific heat and the magnetocaloric effect. We demonstrate the presence of an extended spin Luttinger-liquid phase between two field-induced quantum critical points and over a broad range of temperature. Based on an ideal spin-ladder Hamiltonian, comprehensive numerical modeling of the ladder specific heat yields excellent quantitative agreement with the experimental data across the entire phase diagram.