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arXiv 0807.2757cond-mat.supr-con
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具有深H_{c2}区熔化线的高温超导体中涡旋的Phase Diagram

Phase Diagram of Vortices in High-T_c Superconductors with a Melting Line in the deep H_{c2} Region

J. Dietel, H. Kleinert

摘要:

我们使用一个简单的弹性哈密顿量的涡旋晶格在一个弱的杂质背景,其中包括缺陷的形式的整数值字段计算的自由能的涡旋晶格在深H_{c2}区域。在这一制度的相图是通过应用变分方法的M{é}zard和Parisi开发的随机流形。我们发现布拉格玻璃和涡旋玻璃相之间的一阶线作为熔化线的延续。在液相中,在H-T平面内,在临界温度附近,我们得到了一条几乎垂直的三级玻璃化转变线。此外,我们发现了一个几乎垂直的二级相变线的布拉格玻璃以及涡玻璃相,它跨越了一级布拉格玻璃,涡玻璃转变线。我们计算了感应场的温度导数在这条二阶线上的跳跃,以及熵和磁场在一阶线上的跳跃。

英文摘要:

We use a simple elastic Hamiltonian for the vortex lattice in a weak impurity background which includes defects in the form of integer-valued fields to calculate the free energy of a vortex lattice in the deep H_{c2} region. The phase diagram in this regime is obtained by applying the variational approach of M{é}zard and Parisi developed for random manifolds. We find a first-order line between the Bragg-glass and vortex-glass phase as a continuation of the melting line. In the liquid phase, we obtain an almost vertical third-order glass transition line near the critical temperature in the H-T plane. Furthermore, we find an almost vertical second-order phase transition line in the Bragg-glass as well as the vortex-glass phases which crosses the first-order Bragg-glass, vortex-glass transition line. We calculate the jump of the temperature derivate of the induction field across this second-order line as well as the entropy and magnetic field jumps across the first-order line.

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