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arXiv 1111.1201cond-mat.str-el
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Peierls型相变的能隙与临界温度之比

The gap vs critical temperature ratio in Peierls-type phase transitions

Gennady Y. Chitov

摘要:

我们分析了一个二维自旋-赝自旋模型,其中赝自旋代表电荷自由度。该模型是已知的经历相变的同时出现的长程电荷秩序和自旋间隙。我们展示了如何从经典的非相互作用值的间隙与临界温度比(也称为BCS比)得到重整化。这个值也是普遍的意义上说,这是不依赖于微观参数的模型,必须是相同的各种类型的Peierls-样的转变,其中的自旋间隙是伴随着结构,轨道或电荷顺序。

英文摘要:

We analyze a 2D spin-pseudospin model, where the pseudospins represents the charge degrees of freedom. The model is known to undergo a phase transition with the simultaneous appearance of the long-range charge order and the spin gap. We show how the gap vs critical temperature ratio (also called the BCS ratio) gets renormalized from the classical non-interacting value. This value is also universal in the sense that is does not depend on the microscopic parameters of the model, and must be the same for various types of the Peierls-like transitions where the spin gap is accompanied by the structural, orbital or charge order.

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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