Phys. Rev. B 56, 5132–5135 (1997)Absence of effect of paramagnetic impurities on flux quantization in superconductorsReceived 19 February 1997; published in the issue dated 1 September 1997 In this work we investigate flux quantization effects in uniform superconducting rings doped with paramagnetic impurities. Several theories predicted that the impurity spins in weak links affect superconductivity by inducing phase shifts, which might result in half-integral fluxoid quantization. We tested whether these ideas could be extended to the case of uniform Mo rings doped with Fe, which is paramagnetic, but did not observe any such effects. We explain the absence of such effects within the de Gennes version of the Abrikosov-Gorkov theory of pair breaking. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.56.5132
DOI:
10.1103/PhysRevB.56.5132
PACS:
74.60.Ge, 74.76.-w, 74.50.+r, 74.80.Dm
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