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arXiv 1003.0138cond-mat.str-el
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稀释Kagome反铁磁体中的价键玻璃相

Valence Bond Glass Phase in the Diluted Kagome Antiferromagnets

R. R. P. Singh

摘要:

本文提出了Kagome格点海森堡模型价键晶相中的位稀释理论。空位点的存在导致穿过杂质的强单线键。它还产生了一个自由自旋,在单位晶胞内离域。淬灭杂质的有限浓度导致价键玻璃相。这个阶段有短程价键顺序,没有自旋间隙,大自旋磁化率,线性比热由于两个级别的系统,以及单重态和三重态激发分解成扭结反扭结对离域在几个晶格常数。它提供了一个框架的热力学,中子和拉曼测量的综合理解的Herbertsmithite材料ZnCu 3(OH)6Cl 2,包括最近报道的H/T和Ω/T缩放。

英文摘要:

We present a theory for site dilution in the Valence Bond Crystal Phase of the Kagome Lattice Heisenberg Model. The presence of an empty site leads to strong singlet bond across the impurity. It also creates a free spin, which delocalizes inside the unit cell. Finite concentration of quenched impurities leads to a Valence Bond Glass phase. This phase has short-range Valence Bond order, no spin-gap, large spin susceptibilities, linear specific heat due to two-level systems, as well as singlet and triplet excitations that decompose into kink-antikink pairs delocalized over a few lattice constants. It provides a framework for a comprehensive understanding of thermodynamic, neutron, and Raman measurements in the Herbertsmithite material ZnCu3(OH)6Cl2, including recently reported H/T and omega/T scaling.

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。

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