Abstract
The basic macroscopic properties of the high-T/sub c/ superconductors La/sub 2-//sub x/Sr/sub x/CuO/sub 4/ (x = 0.075--0.20) with bulk transition temperatures up to 37.5 K were studied. The upper and lower critical fields, specific heat, Meissner effect, and electric resistivity were measured and extreme type-II behavior with large upper-critical-field slopes is observed. The density of states at E/sub F/ is caLculated from three different sets of experimental quantities (..gamma../sub BCS/ = 6 +- 1.5 mJ/moleX sup 2: ). The critical temperatures of (La, Sr)/sub 2/CuO/sub 4/ and Ba(Pb,Bi)O/sub 3/ are approx.3 times higher than those of other superconductors with comparable values of ..gamma.., which empirically distinguishes them as a separate class of superconductors.
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