Effects of composition on the upper critical field of V-Ga
1981; Elsevier BV; Volume: 39; Issue: 7 Linguagem: Inglês
10.1016/0038-1098(81)90512-3
ISSN1879-2766
AutoresS. Foner, E. J. McNiff, S. Moehlecke, A. R. Sweedler,
Tópico(s)Superconductivity in MgB2 and Alloys
ResumoMeasurements of the temperature dependence of the upper critical field, Hc2(T), for a series of V100−xGax materials are presented for 20.5 ≤ × ≤ 29.6. Fits of the data to conventional theory for a paramagnetically limited, dirty, type II superconductor show: 1) a maximum in Tc and Hc2(0) for x ≅ 25; 2) a constant (dHc2dT)T = Tc for x ≤ 25; 3) a slowly increasing value of λso with increasing x up to x ∼ 25; and 4) good agreement with stoichiometric ordered and thermally disordered V3Ga. Above x ⪆ 25 broader transitions are observed. For x = 25, Tc = 15.3 K, (dHc2dT)T=Tc = 4.3 TK, λso = 0.3 and Hc2(0) = 23.4 tesla. The effects of inclusion of strong-coupling in the theory are discussed briefly.
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