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Comparison of irreversibility temperatures determined via DC and AC magnetization techniques in conventional superconductors |
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| Authors: | A K Grover S Ramakrishnan Ravi Kumar P L Paulose S K Malik P Chaddah |
| Affiliation: | (1) Department of Physics, Panjab University, 160 014 Chandigarh, India;(2) Tata Institute of Fundamental Research, 400 005 Bombay, India;(3) Solid State Physics Division, Bhabha Atomic Research Centre, 400 085 Bombay, India;(4) Present address: Institute of Fundamental Research, 400 005 Bombay, India |
| Abstract: | 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. |
| Keywords: | Irreversibility line AC and DC magnetization techniques type-I and type-II superconductors |
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