Upper Critical Field Measurements for RBa2Cu3O7 (R = Y,Eu.9Y.1,Sm)
We have measured the upper critical fields for superconducting RBa2Cu3O7 (R=Y,Eu.9Y.1,Sm) up to 27 Tesla, using the midpoint, Tm, of the resistance transition. At the highest fields we find critical field slopes of ∣dHc2/dTm∣ - 2.5, 2.1, and 3.3 Tesla/K for R = Y, Eu.9Y.1 and Sm, respectively, indicating insensitivity of pairing to local moment magnetism in these compounds. The normal state magnetoresistance is extremely small (<10-2).
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