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Quasiparticle Density of States Measurements in Clean Superconducting AlMn Alloys
Published
Author(s)
Galen C. O'Neil, Daniel R. Schmidt, Nathan A. Tomlin, Joel N. Ullom
Abstract
Aluminum doped with Manganese (AlMn) forms a superconducting alloy with the transition temperature suppressed by the added Manganese. We present quasiparticle density of states measurements on superconducting AlMn alloys made by current-voltage measurements on normalmetal/ insulator/supercondutor tunnel junctions. The density of states remains BCS-like with a reduced gap, matching the predictions of Kaiser. However we measure additional subgap states not predicted by Kaiser, and demonstrate that these subgap states will harm some potential applications.
O'Neil, G.
, Schmidt, D.
, Tomlin, N.
and Ullom, J.
(2010),
Quasiparticle Density of States Measurements in Clean Superconducting AlMn Alloys, Physical Review B, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903374
(Accessed October 8, 2025)