Abstract
Superconductivity, structure and electrical resistance behaviour of σ-phase alloys of Nb−Rh and Ta−Rh are investigated. The Ta−Rh alloys do not become superconducting above 1.2 K. The\(T_c , \left( { - \frac{{dH_{c2} }}{{dT}}} \right)_{T = T_c } \) andH c2 (0) values of a homogeneous alloy with the composition Nb65.2Rh34.8 are 2.95 K, 13.9 kG/K and 23 kG, respectively, whereas for an inhomogeneous alloy with the composition Nb63.7Rh36.3 these values are 4.24 K, 5.5 kG/K and 14 kG, respectively. Splat quenching results in a substantial increase in the\(\left( { - \frac{{dH_{c2} }}{{dT}}} \right)_{T = T_c } \) andH c2 (0) values of the Rh-rich sample. Annealing (900°C, 100 h) of the Rh-rich sample leads only to small changes in the superconducting properties but a small amount of Nb−Rh solid solution has been formed. The electrical resistance of Nb65.2Rh34.8 decreases with decreasing temperature and varies asT ∼0.5 between 150 and 240 K and asT between 60 and 140 K. For Ta70.0Rh30.0 the temperature coefficient changes to negative values below 170K. λ values are calculated for Nb−Rh using McMillan's formula. An estimatedT c value of Ta−Rh is 0.2 K. TheH c2 (0) values of Nb−Rh are in good agreement with the theoreticalH 2** c (0) values.
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Dedicated to Prof. Dr. W. Buckel on the occasion of his 60th birthday
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Khan, H.R., Lüders, K., Raub, C.J. et al. Superconductivity and resistance behaviour of σ-phase alloys: Nb−Rh and Ta−Rh. Z. Physik B - Condensed Matter 38, 27–33 (1980). https://doi.org/10.1007/BF01321199
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DOI: https://doi.org/10.1007/BF01321199