Microscopic origin of the Dynes parameter Γ of the LaAlO3-SrTiO3 interface superconductor
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2020-10-19
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Journal Article
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Abstract
The superconducting density of states of the two-dimensional electron system at the LaAlO3-SrTiO3 interface exhibits broad quasiparticle peaks that are well described by the Dynes parameter Γ. We measured Γ in a wide range of temperatures and gate voltages using tunneling spectroscopy. Γ exhibits a Tq temperature dependence, with q=2.2±0.2. We discuss several interpretations of Γ and conclude that Γ is an intrinsic parameter of the superconducting state that quantifies the effect of the pair-breaking processes in the superconductor. The strong temperature dependence at low temperatures rules out inelastic electron scattering and magnetic scattering as the origin of the pair breaking. We find that Γ can be explained by interband scattering and by scattering in a superconductor with nodes in the order parameter. © 2020 authors. Published by the American Physical Society.
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Volume
102 (13)
Pages / Article No.
134506
Publisher
American Physical Society