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arXiv 1408.2197cond-mat.supr-con
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Yb(3)Rh(4)Sn(13)单晶中的顺磁迈斯纳效应

Paramagnetic Meissner effect in single crystal Yb(3)Rh(4)Sn(13)

P. Kulkarni

摘要:

在Yb(3)Rh(4)Sn(13)单晶中观察到顺磁迈斯纳效应。当磁场冷却样品时,在7.92 K的超导转变开始时,DC磁化强度首先在7.85 K处经历最小值,然后在7.6 K处出现PME信号的峰值,然后跨越到抗磁状态。磁化强度-磁场曲线在最小值以上是可逆的,在7.85K以下具有钉扎特性。最小值可以归因于表面超导性对直流磁化信号的相反贡献。随后的通量压缩,同时冷却样品低于7.85 K显示的直流磁化信号的快速增加。PME信号实际上是与磁通压缩相反的抗磁性。

英文摘要:

Paramagnetic Meissner effect was observed in single crystal Yb(3)Rh(4)Sn(13). While field cooling the sample, at the onset of the superconducting transition at 7.92 K, the DC magnetization first goes through a minimum at 7.85 K, followed by the peak of the PME signal at 7.6 K and then crosses over to the diamagnetic state. The magnetization vs field curves are reversible above the minimum and imbibe a pinning characteristic below 7.85 K. The minimum can be attributed to the opposing contribution to the dc magnetization signal from surface superconductivity. The subsequent flux compression while cooling the sample below 7.85 K shows the rapid increase in the dc magnetization signal. PME signal is actually the diamagnetism opposing the flux compression.

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