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arXiv 1101.5403cond-mat.mtrl-scicond-mat.stat-mech
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多铁性热力学

Multiferroic Thermodynamics

G. R. Boyd, P. Kumar, S. R. Phillpot

摘要:

研究了铁磁序和铁电序耦合的多铁性体系的热力学性质。有些结果与自由能的形式无关。我们计算的电,磁,磁电磁化率的温度依赖性。交叉磁化率具有与比热的混合(相对于E和B)导数相关的温度依赖性。这些相变都是二级相变。特别地,相边界T $_M$(E),其中T $_M$是作为电场的函数的较低的磁转变,由Eklfest关系描述。的磁电磁化率是非零的,只有低于两个转变温度的较低。我们研究了比热的性质,包括和不包括高斯波动。微扰的重整化群是用来理解理论的不动点,我们包括一个讨论的效果不均匀性为这个模型。

英文摘要:

We have studied the thermodynamic properties of a multiferroic that couples ferromagnetic and ferroelectric order. Some of the results are independent of the form of the free energy. We calculate the temperature dependence of the electric, magnetic, and magnetoelectric susceptibilities. The cross susceptibility has a temperature dependence related to the mixed (with respect to E and B) derivatives of the specific heat. The phase transitions are all second order. In particular, the phase boundary T$_M$(E), where T$_M$ is the lower magnetic transition as a function of electric field, is described by the Ehrenfest relation. The magnetoelectric susceptibility is nonzero only below the lower of the two transition temperatures. We study the properties of the specific heat, with and without the inclusion of gaussian fluctuations. The perturbative renormalization group is used to understand the fixed points of the theory, and we include a discussion of the effect inhomogeneities have for this model.

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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