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arXiv 1409.8358cond-mat.supr-con
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从高分辨率specific heat实验中磁场引起的经典超导体V3Si临界涨落范围的扩大

Magnetic field induced enlargement of the regime of critical fluctuations in the classical superconductor V3Si from high-resolution specific heat experiments

Y. Zheng, Y. Liu, N. Toyota, R. Lortz

摘要:

我们报告的高分辨率比热数据的高品质单晶的经典超导体V3 Si,这揭示了微小的双曲线形状的异常出现叠加到BCS比热跳在超导转变的磁场2 T和更高。这些异常的出现伴随着磁场诱导的超导转变的加宽。我们证明,使用的3d-XY和3d-最低朗道能级(3d-LLL)普适性类的波动模型预测的标度关系,临界波动的影响变得实验观察到由于磁场引起的扩大制度的临界波动。标度表明,由于准粒子限制到低朗道水平的有效维数的减少是负责这种效果。

英文摘要:

We report high-resolution specific heat data on a high-quality single crystal of the classical superconductor V3Si, which reveal tiny lambda-shape anomalies appearing superimposed onto the BCS specific heat jump at the superconducting transition in magnetic fields of 2 T and higher. The appearance of these anomalies is accompanied by a magnetic-field-induced broadening of the superconducting transition. We demonstrate, using scaling relations predicted by the fluctuation models of the 3d-XY and the 3d-Lowest-Landau-Level (3d-LLL) universality class, that the effect of critical fluctuations becomes experimentally observable due to of a magnetic field-induced enlargement of the regime of critical fluctuations. The scaling indicates that a reduction of the effective dimensionality due to the confinement of quasiparticles into low Landau levels is responsible for this effect.

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