Microwave absorption and paracoherence excess conductivity studies in high-Tc superconductors |
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Authors: | S. V. Sharma T. K. Nath A. K. Majumdar |
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Affiliation: | a Department of Physics, Indian Institute of Technology, Kanpur 208016, India b Hindustan College of Science and Technology, Artoni, Agra 7, India |
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Abstract: | Single phase polycrystalline samples of La1.8Sr0.2CuO4, YBa2Cu3O7−δ and Bi1.6Pb0.4Sr2Ca2Cu3Oy high-Tc superconductors have been studied using XRD, SEM, EDAX, (T), χAC and EPR techniques. Detailed investigations on low-field-dependent microwave absorption have been carried out in order to investigate the effects of field exposure, field cooling, zero field cooling and amplitude of field variation on the samples. The results have been discussed on the basis of granular model via Josephson junctions of high-Tc superconductors. Over and above, paracoherence excess conductivity analysis has been carried out in all the three samples. The critical exponent (γ) estimated for all the three samples in close vicinity to their respective transition temperatures has an excellent agreement with the theoretically predicted value for 3-dimensional XY-ferromagnet (γ = 1.33 for D = 3, N = 2). |
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Keywords: | Microwave absorption Paracoherence excess conductivity Structural property Transport property |
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