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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.
Citation
Physical Review B
Volume
107
Issue
9

Keywords

Microrefrigerator, Normal-insulator-superconductor tunnel junction, Implanted superconductor, Superconducting density of states

Citation

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 April 14, 2024)
Created May 6, 2010, Updated February 19, 2017