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Theory of Tunneling Anomaly in Superconductor above Paramagnetic Limit | | Hae-Young Kee
; I.L. Aleiner
; B.L. Altshuler
; | | Date: |
15 Feb 1998 | | Subject: | Superconductivity; Disordered Systems and Neural Networks | cond-mat.supr-con cond-mat.dis-nn | | Abstract: | We study the tunneling density of states (DoS) in the superconducting systems driven by Zeeman splitting $E_Z$ into the paramagnetic phase. We show that, even though the BCS gap disappears, superconducting fluctuations cause a strong DoS singularity in the vicinity of energies $-E^*$ for electrons polarized along the magnetic field and $E^*$ for the opposite polarization. The position of this singularity $E^*=case{1}{2}(E_Z + sqrt{E_Z^2- Delta^2})$ (where $Delta$ is BCS gap at $E_Z=0$) is universal. We found analytically the shape of the DoS for different dimensionality of the system. For ultra-small grains the singularity has the shape of the hard gap, while in higher dimensions it appears as a significant though finite dip. The spin-orbit scattering, and the orbital magnetic field suppress the singularity. Our results are qualitatively consistent with recent experiments in superconducting films. | | Source: | arXiv, cond-mat/9802160 | | Services: | Forum | Review | PDF | Favorites | |
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