Magnetic Field Dependence of the Specific Heat of Some High-Tc Superconductors
Measurements of specific heat, C, were made on samples of La2CuO4−y (La1), La1.85M0.15CuO4−y (Ca1, Sr1, Sr2, Ba1 and Ba2) and YBa2Cu3O9−y (Y1). Meissner effect measurements were made in 12.5G. The high-temperature onset of a change in magnetic susceptibility, χ, was taken as Tc, and the transition width, ΔTc, as the temperature interval of the 10–90% change in χ. Calculation of the fractional Meissner effect, −4πχV, was based on the total sample volume, with χV corrected for demagnetizing effects. Figure 1 is a plot of −4πχV vs T.
KeywordsMagnetic Susceptibility Field Dependence Transition Width Magnetic Field Dependence Weak Coupling Limit
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