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Mystery of Excess Low Energy States in a Disordered Superconductor in a Zeeman Field | | Y. L. Loh
; N. Trivedi
; Y. M. Xiong
; P. W. Adams
; G. Catelani
; | | Date: |
18 Feb 2011 | | Abstract: | Tunneling density of states measurements of disordered superconducting (SC)
Al films in high Zeeman fields reveal a significant population of subgap states
which cannot be explained by standard BCS theory. We provide a natural
explanation of these excess states in terms of a novel disordered
Larkin-Ovchinnikov (dLO) phase that occurs near the spin-paramagnetic
transition at the Chandrasekhar-Clogston critical field. The dLO superconductor
is characterized by a pairing amplitude that changes sign at domain walls.
These domain walls carry magnetization and support Andreev bound states, which
lead to distinct spectral signatures at low energy. | | Source: | arXiv, 1102.3889 | | Services: | Forum | Review | PDF | Favorites | |
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