Ultrasonic attenuation in a superconducting vanadium-tantalum alloy

B. R. Tittmann

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Ultrasonic-attenuation measurements have been carried out on the magnetically reversible, type-II superconductor V - 5.6-at.% Ta with both a high Ginzburg-Landau parameter (G5) and the Bardeen, Cooper, and Schrieffer (BCS) coherence length 5 times the electronic mean free path. The electronic attenuation in zero magnetic field below Tc is BCS-like, giving a zero-temperature energy gap 20(0,0)3. 6kBTc, and in the normal state has the theoretically predicted dependence on q and l. The upper critical field Hc2 could be deduced from the attenuation data to an accuracy better than 1%, and its temperature dependence agrees well with type-II theory without p-wave scattering of electrons. Use of the measured normal-state resistivity and ultrasonically determined values of Tc, Hc2(T), and H at H=Hc2 inserted in an ultrasonic-attenuation theory due to Maki enabled the calculation of an Abrikosov-Maki parameter 2, which agreed roughly with the 2 obtained in previous magnetic and calorimetric measurements. Thus, for H close to Hc2, the data agree with Maki's dirty-limit (0l1) theory, which predicts a linear dependence of on H. At fields farther from Hc2, (H) deviates from linearity and appears to fit empirically a parabolic function of H. At very low fields HHc1, the H and T dependence of is in apparent agreement with another theory. Physical insight into the behavior in this region could be obtained with a model in which vortices are replaced by cylinders of completely normal material imbedded in a superconducting matrix.

Original languageEnglish (US)
Pages (from-to)625-637
Number of pages13
JournalPhysical Review B
Volume2
Issue number3
DOIs
StatePublished - Jan 1 1970

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tantalum alloys
vanadium alloys
ultrasonics
attenuation
wave scattering
electronics
mean free path
magnetic measurement
linearity
far fields
vortices
temperature dependence
electrical resistivity
matrices
magnetic fields
electrons

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Tittmann, B. R. / Ultrasonic attenuation in a superconducting vanadium-tantalum alloy. In: Physical Review B. 1970 ; Vol. 2, No. 3. pp. 625-637.
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Ultrasonic attenuation in a superconducting vanadium-tantalum alloy. / Tittmann, B. R.

In: Physical Review B, Vol. 2, No. 3, 01.01.1970, p. 625-637.

Research output: Contribution to journalArticle

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