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arXiv 0901.1222cond-mat.supr-con
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外磁场作用下时间反演对称破缺超导体的隧穿电导和局域态密度

Tunneling conductance and local density of states in time-reversal symmetry breaking superconductors under the influence of an external magnetic field

Mihail A. Silaev, Takehito Yokoyama, Jacob Linder, Yukio Tanaka, Asle Sudbø

摘要:

我们考虑了时间反演对称破缺超导体在外加磁场作用下的不同效应,从而使超导体处于混合态。我们特别关注两个时间反演对称性破缺序参量,它们被认为是在实际材料中实现的:$p+ıp'$ -波和$d+ıs$ -或$d+ıd'$ -波。一序参量是有关的Sr $_2$ RuO $_4$,而后者的序参量已被建议存在于一些高- $T_c$铜酸盐的表面附近。我们研究了在外加磁场存在下表面态和涡旋态之间的相互作用及其对隧穿电导和局域态密度的影响。我们的研究结果可能有助于从实验上确定非常规时间反演对称性破缺超导态的对称性。

英文摘要:

We consider different effects that arise when time-reversal symmetry breaking superconductors are subjected to an external magnetic field, thus rendering the superconductor to be in the mixed state. We focus in particular on two time-reversal symmetry breaking order parameters which are believed to be realized in actual materials: $p+ıp'$-wave and $d+ıs$- or $d+ıd'$-wave. The first order parameter is relevant for Sr$_2$RuO$_4$, while the latter order parameters have been suggested to exist near surfaces in some of the high-$T_c$ cuprates. We investigate the interplay between surface states and vortex states in the presence of an external magnetic field and their influence on both the tunneling conductance and the local density of states. Our findings may be helpful to experimentally identify the symmetry of unconventional time-reversal symmetry breaking superconducting states.

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