Debye-Huckel theory for spin ice at low temperature
Debye-Huckel theory for spin ice at low temperature
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DOI：
10.1103/physrevb.84.144435
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发表时间：
2011-10-31
影响因子：
3.7
通讯作者：
Sondhi, S. L.
中科院分区：
文献类型：
--
作者：
Castelnovo, C.;Moessner, R.;Sondhi, S. L.
在低温下，自旋冰中充满了有限密度的具有互磁库仑相互作用的磁单极点状拓扑缺陷。我们在德拜-休克尔理论的框架内讨论了由此产生的磁性库仑液体的性质，并为此提供了详细的特定背景说明。我们讨论热力学和动力学特征，并将德拜-休克尔理论与实验以及数值进行比较，包括比热和交流磁化率的数据。我们还评估了除磁性相互作用之外还存在的熵库仑相互作用，并表明它在当前化合物中在数量上并不重要。最后，我们讨论了结合单极子反单极子对的作用，并推导了单极子迁移率的表达式。
At low temperatures, spin ice is populated by a finite density of magnetic monopoles-pointlike topological defects with a mutualmagnetic Coulomb interaction. We discuss the properties of the resulting magnetic Coulomb liquid in the framework of Debye-Huckel theory, for which we provide a detailed context-specific account. We discuss both thermodynamical and dynamical signatures and compare Debye-Huckel theory to experiment as well as numerics, including data for specific heat and AC susceptibility. We also evaluate the entropic Coulomb interaction that is present in addition to the magnetic one and show that it is quantitatively unimportant in the current compounds. Finally, we address the role of bound monopole anti-monopole pairs and derive an expression for the monopole mobility.