Observation of Nonmagnetic Resonant Scattering Effects by Tunneling in Dilute Al-Mn Alloy Superconductors

G. O’Neil; D. Schmidt; N. A. Miller; J. N. Ullom; A. Williams; G. B. Arnold; S. T. Ruggiero

doi:10.1103/PhysRevLett.100.056804

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Observation of Nonmagnetic Resonant Scattering Effects by Tunneling in Dilute Al-Mn Alloy Superconductors

G. O’Neil, D. Schmidt, N. A. Miller, J. N. Ullom, A. Williams, G. B. Arnold, S. T. Ruggiero

DOI 10.1103/PhysRevLett.100.056804 · Physical Review Letters

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Abstract

We have observed the BCS-like density of states predicted for energy-gap suppression by nonmagnetic Anderson impurities in superconductors. We show that Mn impurities in Al exhibit no magnetic character and act exclusively as strong resonant scattering sites without producing time-reverse symmetry breaking of Cooper pairs (pair breaking).

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.2	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown