Magnetic and nonmagnetic impurities in some A-15 structure systems. I. Superconducting properties |
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Authors: | Bongi G H Flükiger R Treyvaud A Fischer ø |
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Affiliation: | (1) Département de Physique de la Matière Condensée, Université de Genève, Geneva, Switzerland |
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Abstract: | We present measurements of the critical temperature T
c and the critical field H
c2 of the A-15 structure systems Nb
y
,Pt100–y–x
M
x
where M = Fe and Ru (y = 73–78). T
c is influenced by two effects: one due to the magnetic Fe atoms, which causes a strong decrease, and the other due to the nonmagnetic effect of the Fe atoms, which causes a smaller but non-negligible effect. For the study of the nonmagnetic effect we introduced Ru impurities instead of Fe. Anomalous high critical field values are found as T 0, and the curves H
c2 versus T do not follow the WHH theory generalized to include magnetic impurities. The introduction of an empirical parameter permits us to fit our experimental results. This abnormal behavior of H
c2 is discussed in terms of strong-coupling and anisotropy effects. |
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Keywords: | |
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