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High temperature superconductors; lower critical field; magnetization curves; critical currents; hysteresis loops

We present a calculation of the isothermal magnetization hysteresis curves appropriate to highT_csuperconductors. We discuss the nature of the low field anomaly as one goes from this strong pinning case to the weak pinning case. We show that the shape of the equilibrium (thermodynamic) magnetization curve is recovered in the limit ofJ_capproaching zero.

G Ravi Kumar¹ P Chaddah¹

1. Nuclear Physics Division, Bhabha Atomic Research Centre, Bombay - 400 085, India

Published

December 1988

Manuscript received

5 July 1988

Manuscript revised

23 September 1988