arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0711.3471cond-mat.stat-mechcond-mat.other
收藏

三角形Kagome晶格上Ising自旋的热力学:精确分析方法和蒙特卡罗模拟

Thermodynamics of Ising spins on the Triangular Kagome Lattice: Exact analytical method and Monte Carlo simulations

Yen Lee Loh, Dao-Xin Yao, Erica W. Carlson

摘要:

利用精确解析方法和蒙特卡罗模拟研究了三角形kagome晶格(TKL)上Ising自旋的热力学性质。我们提出了自由能,内能,比热,熵,亚晶格磁化强度和磁化率。我们描述了丰富的相图的耦合常数,温度和施加的磁场的函数的模型。对于在没有外加场的情况下的受抑相互作用,基态是自旋液相,每自旋具有整数剩余熵$s_0/k_B={1/9} \ln 72\approx 0.4752...$。在弱外场下,系统映射为蜂窝晶格上的二聚体模型,无理剩余熵为0.0359/自旋,准长程序,自旋-自旋关联符合幂律,中子散射可以探测到.在有限温度下,幂律相关变为指数相关,但相关长度可能仍然很长。

英文摘要:

We study the thermodynamics of Ising spins on the triangular kagome lattice (TKL) using exact analytic methods as well as Monte Carlo simulations. We present the free energy, internal energy, specific heat, entropy, sublattice magnetizations, and susceptibility. We describe the rich phase diagram of the model as a function of coupling constants, temperature, and applied magnetic field. For frustrated interactions in the absence of applied field, the ground state is a spin liquid phase with integer residual entropy per spin $s_0/k_B={1/9} \ln 72\approx 0.4752...$. In weak applied field, the system maps to the dimer model on a honeycomb lattice, with irrational residual entropy 0.0359 per spin and quasi-long-range order with power-law spin-spin correlations that should be detectable by neutron scattering. The power-law correlations become exponential at finite temperatures, but the correlation length may still be long.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑