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Irreversibility line; AC and DC magnetization techniques; type-I and type-II superconductors

A comparison has been made of irreversibility temperature determined by four different methods in few specimens of lead (type-I) and niobium (type-II). The merger ofM_ZFC(T) andM_FC(T) curves giveT_r(H) values lower than those evident from vanishing the hysteresis in isothermal DC magnetization. The identification of peak temperature inx″_H(T) data withT_r(H) is appropriate only if the contribution from changes in the normal state electrodynamics can be isolated and the peak is narrow. The appearance of differential paramagnetic effect inx′_H(T) data is adequate to imply reversibility, however, its efficacy to precisely locate irreversibility line remains to be established.

A K Grover^{1 2} S Ramakrishnan³ Ravi Kumar³ P L Paulose³ S K Malik³ P Chaddah⁴

1. Department of Physics, Panjab University, Chandigarh - 160 014, India
2. Institute of Fundamental Research, Bombay - 400 005, India
3. Tata Institute of Fundamental Research, Bombay - 400 005, India
4. Solid State Physics Division, Bhabha Atomic Research Centre, Bombay - 400 085, India

Published

December 1991

Manuscript received

1 July 1991