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arXiv 1004.4898cond-mat.str-el
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Mott转变的标度理论和Grüneisen标度在有限温度临界终点附近的破裂

Scaling theory of the Mott transition and breakdown of the Grüneisen scaling near a finite-temperature critical end point

Lorenz Bartosch, Mariano de Souza, Michael Lang

摘要:

我们讨论了在有限温度临界端点附近的晶格响应的标度理论。的热膨胀系数被证明是更奇异的比热,这样的Grüneisen比发散的临界点接近,除了其附近。更一般地说,我们表示的尺度函数,我们明确评估的二维伊辛普适性类的热膨胀系数。最近对层状有机导体kappa-(BEDT-TTF)_2X在Mott转变附近的热膨胀系数的测量得到了很好的描述。

英文摘要:

We discuss a scaling theory of the lattice response in the vicinity of a finite-temperature critical end point. The thermal expansivity is shown to be more singular than the specific heat such that the Grüneisen ratio diverges as the critical point is approached, except for its immediate vicinity. More generally, we express the thermal expansivity in terms of a scaling function which we explicitly evaluate for the two-dimensional Ising universality class. Recent thermal expansivity measurements on the layered organic conductor kappa-(BEDT-TTF)_2 X close to the Mott transition are well described by our theory.

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