Meissner effect probing of odd-frequency triplet pairing in superconducting spin valves
Meissner effect probing of odd-frequency triplet pairing in superconducting spin valves
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DOI：
10.1103/physrevb.89.054508
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发表时间：
2014-02-18
影响因子：
3.7
通讯作者：
Linder, Jacob
中科院分区：
文献类型：
--
作者：
Alidoust, Mohammad;Halterman, Klaus;Linder, Jacob
超导关联由于其自旋极化特性和在自旋电子学器件中的潜在应用而引起人们的广泛关注。尽管实验已经证明了这种相关性的缓慢衰减，但已经证明更难以获得其奇频特性的确凿证据，即例如，在一个实施例中，因为他们的无间隙行为。在这里，我们表明，正常金属接触超导自旋阀的磁化率响应提供了正是这种签名，即，在一个异常的正迈斯纳效应的形式，这可能是简单地通过改变自旋阀的磁化配置调谐回传统的负迈斯纳响应。
Superconducting correlations which are long ranged in magnetic systems have attracted much attention due to their spin-polarization properties and potential use in spintronic devices. Whereas experiments have demonstrated the slow decay of such correlations, it has proven more difficult to obtain a smoking gun signature of their odd-frequency character which is responsible, e. g., for their gapless behavior. Here we demonstrate that the magnetic susceptibility response of a normal metal in contact with a superconducting spin valve provides precisely this signature, namely, in the form of an anomalous positive Meissner effect, which may be tuned back to a conventional negative Meissner response simply by altering the magnetization configuration of the spin valve.