Enhancing superconductivity: Magnetic impurities and their quenching by magnetic fields
Enhancing superconductivity: Magnetic impurities and their quenching by magnetic fields
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增强超导性：磁性杂质及其磁场猝灭
DOI：
10.1209/epl/i2006-10218-2
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
P. Goldbart
中科院分区：
文献类型：
--
作者：
T. Wei;D. Pekker;A. Rogachev;A. Bezryadin;P. Goldbart
已知磁场和磁性杂质都能抑制超导性。然而，当磁场淬灭（即极化）杂质时，当两种效应都存在时，丰富的结果，包括场增强超导性，可以出现。在超导导线和薄膜中，这种场-自旋相互作用通过Eilenberger-Usadel方案进行了研究。非单调依赖的临界电流的字段（因此，场增强超导性）被发现是可能的，即使在参数制度的超导临界温度随磁场的增加单调下降。本工作补充了Kharitonov和Feigel'man的工作（JETP Lett.，82（2005）421），其预测临界温度的非单调行为的状态。
Magnetic fields and magnetic impurities are each known to suppress superconductivity. However, as the field quenches (i.e. polarizes) the impurities, rich consequences, including field-enhanced superconductivity, can emerge when both effects are present. In superconducting wires and thin films this field-spin interplay is investigated via the Eilenberger-Usadel scheme. Non-monotonic dependence of the critical current on the field (and therefore field-enhanced superconductivity) is found to be possible, even in parameter regimes for which the superconducting critical temperature decreases monotonically with increasing field. The present work complements that of Kharitonov and Feigel'man (JETP Lett., 82 (2005) 421), which predicts regimes of non-monotonic behavior of the critical temperature.