Comment on “Phase diagram of reentrant and magnetic-field-induced superconducting states with Kondo impurities in bulk and proximity-coupled compounds”
Guy Deutscher, Shay Hacohen-Gourgy, A. C. Mota
DOI 10.1103/PhysRevB.87.136501 · Physical Review B
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Abstract
The Meissner effect induced in a normal metal in close contact with a superconductor is known to weaken at very low temperatures, and to be restored by the application of a moderate magnetic field [Visani et al., Phys. Rev. Lett. 65, 1514 (1990)]. This reentrant behavior was recently interpreted as resulting from the presence of Kondo impurities in the normal metal, with calculated concentrations on the order of 100 ppm [Simons et al., Phys. Rev. B 86, 064509 (2012)]. We show here that in fact the presence of magnetic impurities in the normal metal at such concentrations is ruled out by the absence of a minimum of resistivity in the same samples down to 2 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.2 | Pressure not reported | onset |
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