Title

Origin of excess low-energy states in a disordered superconductor in a Zeeman field

Document Type

Article

Publication Date

8-2-2011

Abstract

Tunneling density of states measurements of disordered superconducting 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 phase that occurs near the spin-paramagnetic transition at the Chandrasekhar-Clogston critical field. The disordered Larkin-Ovchinnikov superconductor is characterized by a pairing amplitude that changes sign at domain walls. These domain walls carry magnetization and support Andreev bound states that lead to distinct spectral signatures at low energy. © 2011 American Physical Society.

Publication Source (Journal or Book title)

Physical Review Letters

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