Magnetization experiments around Tc in cuprate superconductors: thermal fluctuation, random orientation and inhomogeneity effects

We present some measurements of the crossing point of the excess magnetization vs. temperature curves, (Δ M*, T*), and of the Meissner fraction, χ FC( T), in granular La 1.9Sr 0.1CuO 4 (LaSCO) samples, before and after grain alignment. These results show that once Δ M* and χ FC are adequately and se...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2000, Vol.332 (1), p.389-392
Main Authors: Torrón, C, Mosqueira, J, Currás, S.R, Veira, J.A, Revcolevschi, A, Vidal, F
Format: Article
Language:English
Subjects:
Grain alignement (texturing)
Magnetization
Thermal fluctuation
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Summary:We present some measurements of the crossing point of the excess magnetization vs. temperature curves, (Δ M*, T*), and of the Meissner fraction, χ FC( T), in granular La 1.9Sr 0.1CuO 4 (LaSCO) samples, before and after grain alignment. These results show that once Δ M* and χ FC are adequately and separately corrected for random grain orientation and demagnetizing effects, the remaining extrinsic effects on Δ M ab * (associated with structural and, mainly, stoichiometric inhomogeneities) may be taken into account through χ ab FC( T*). The intrinsic Δ M ab * values agree with the predictions based on thermal fluctuations of pancakes.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(99)00709-1