Upper critical fields and high superconducting transition temperatures of La1.85Sr0.15CuO4 and La1.85Ba0.15CuO4

Capone, D. W.; Hinks, D. G.; Jorgensen, J. D.; Zhang, K.
March 1987
Applied Physics Letters;3/2/1987, Vol. 50 Issue 9, p543
Academic Journal
The superconducting transition temperature Tc of La1.85Sr0.15CuO4 is measured to be 34.7 K (midpoint) with a transition width (10–90%) of 2.6 K. The critical field slope at Tc is 2.13 T/K. Using the Werthamer, Helfand, and Hohenberg expression in the dirty limit we estimate the upper critical field Hc2(0) to be at least 50 T for this system. The measured transition width broadens initially with increasing field to 4 K, then saturates at this value for fields above 2 T. The critical field slope for the lower Tc material La1.85Ba0.15CuO4 is measured to be 1.78 T/K, which yields an Hc2(0) of at least 36 T.


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