On the Sarma-Type Phase Transitions in Ferromagnet/Superconductor/Ferromagnet Tunneling Junctions with Highly Spin-Polarized Ferromagnets

On the Sarma-Type Phase Transitions in Ferromagnet/Superconductor/Ferromagnet Tunneling Junctions with Highly Spin-Polarized Ferromagnets
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高自旋极化铁磁体铁磁体/超导/铁磁体隧道结中的 Sarma 型相变

DOI:
10.1007/s10948-011-1398-8
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发表时间:
2012
影响因子:
1.8
通讯作者:
Biao Jin
Biao Jin
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Biao Jin

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在铁磁/超导/铁磁双隧穿结中,自旋极化的隧穿电流在磁化方向的反平行排列中引起超导体中的自旋不平衡,这与顺磁极限下的塞曼效应一样,具有对断裂效应,抑制超导性。特别地,当铁磁体是高自旋极化时,强自旋不平衡可能导致在低温和低偏压下从超导相到正常相的一级相变。这种相变伴随着超导带隙参数的大幅度不连续下降,在低能输运中表现出独特的特征。
In the ferromagnet/superconductor/ferromagnet double tunneling junctions, the spin-polarized tunneling current in the antiparallel alignment of the magnetization induces spin imbalance in the superconductor, which has a pair breaking effect depressing superconductivity in the same way that the Zeeman effect does in the paramagnetic limit. In particular, it is shown that when the ferromagnets are highly spin polarized, the strong spin imbalance may lead to a first-order phase transition from the superconducting phase to the normal phase at low temperature and low bias voltage. This phase transition accompanies a large discontinuous drop in superconducting gap parameter bring in distinctive features in low energy transport.
DOI: --
发表时间: 2003-02
期刊: --
影响因子: --
作者:
三谷 誠司
通讯作者: 三谷 誠司