X-ray-absorption fine-structure study of the A15 superconductors Nb3(Sn,Sb)
J. B. Boyce, F. Bridges, T. Claeson, T. H. Geballe, G. W. Hull, N. Kitamura, F. Weiss
DOI 10.1103/PhysRevB.37.54 · Physical Review B
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Abstract
X-ray-absorption fine-structure measurements at the Sn and Sb K edges were made on Nb3Sn, Nb3Sb, and Nb3Sn1−xSbx alloys. No temperature-dependent anomalies were noted for the Sn-Nb and Sb-Nb distances or for the broadening in these distances for temperatures from 4.2 K to well above the transition temperatures. The temperature dependence of the broadenings fits an Einstein oscillator model well, with Einstein temperatures of 237 K for Nb3Sn and 254 K for Nb3Sb. These results also agree with recent theoretical calculations. The Debye-Waller–type broadening in the Sn-Nb and Sb-Nb distances for the alloys are not equal to one another, but instead are nearly equal to those of the binary end-point compounds, i.e., to Nb3Sn and Nb3Sb, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
| Nb3Sb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure not reported | unknown |
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