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Aligia AA 《Physical review. B, Condensed matter》1993,47(22):15308-15311
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Abdalla A. Elabbar 《Physica C: Superconductivity and its Applications》2009,469(4):147-150
Low-field ac measurements of magnetic susceptibility of YBa2Cu3O7 high-temperature superconducting thin film were carried out over a wide range of temperatures and ac magnetic field amplitudes. A strong field dependence of the real χ′ and imaginary χ″ components was observed. The field dependence of the imaginary component is used to extract the temperature dependence of the critical current density in the sample using the critical state model. The exponent β of the power law relation Jc ~ (1 ? T/Tc)β was determined from ac-susceptibility data and different values were found. Experimental results are compared with predictions of some existing theoretical models describing the ac response of superconducting thin film in perpendicular ac field. 相似文献
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Baily SA Maiorov B Zhou H Balakirev FF Jaime M Foltyn SR Civale L 《Physical review letters》2008,100(2):027004
Angular dependent resistivity measurements of optimally doped YBa2Cu3O7 films in fields H pulsed to 50 T are presented. Up to the highest H, the vortex melting field Hm increases and vortex motion is reduced for H aligned with the correlated pinning centers along the main crystalline axes, otherwise 3D anisotropic scaling describes the vortex dynamics. For H parallel ab, the rapid increase in Hm at low temperatures and a critical exponent analysis near Hm confirm the presence of the liquid-crystalline smectic phase predicted for layered superconductors. 相似文献