arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.4220cond-mat.dis-nncond-mat.supr-con
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三维XY自旋玻璃的大尺度动力学模拟

Large-scale dynamical simulations of the three-dimensional XY spin glass

Qing-Hu Chen

摘要:

在电流驱动的三维XY自旋玻璃中进行了大规模的模拟,样品尺寸达到$64^3$,具有连续分流的结动力学。据观察,在低温下的线性电阻率趋于零,提供了一个有限的温度相相干(即自旋玻璃)转变的有力证据。动态标度分析表明,一个完美的崩溃的电流-电压数据可以实现。得到的临界指数与平衡态蒙特卡罗模拟结果一致,并且与高温$_c$铜氧化物超导体的各种实验结果一致。我们认为自旋和手征同时有序。一个真正的连续脱钉转变被发现在零温度。对于低温蠕变运动,临界指数进行评估,并观察到在低温有序相的非阿氏蠕变运动。本文提出XY自旋玻璃能有效地描述具有d波对称性的高温$_c$超导体的输运性质。

英文摘要:

Large-scale simulations have been performed in the current-driven three-dimensional XY spin glass with resistively-shunted junction dynamics for sample sizes up to $64^3$. It is observed that the linear resistivity at low temperatures tends to zero, providing a strong evidence of a finite temperature phase-coherence (i.e. spin-glass) transition. Dynamical scaling analysis demonstrates that a perfect collapse of current-voltage data can be achieved. The obtained critical exponents agree with those in equilibrium Monte Carlo simulations, and are compatible with those observed in various experiments on high-T$_c$ cuprate superconductors. It is suggested that the spin and the chirality order simultaneously. A genuine continuous depinning transition is found at zero temperature. For low temperature creep motion, critical exponents are evaluated, and a non-Arrhenius creep motion is observed in the low temperature ordered phase. It is proposed that the XY spin glass gives an effective description of the transport properties in high-T$_c$ superconductors with d-wave symmetry.

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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