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20 November 2017
  » arxiv » cond-mat/0512700

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Anomalous precursor diamagnetism at low reduced magnetic fields in underdoped La1.9Sr0.1CuO4 and in Pb55In45 superconductors and Tc inhomogeneities
L. Cabo ; F. Soto ; M. Ruibal ; J. Mosqueira ; F. Vidal ;
Rating Members: 3.5/5 (1 reader) | Visitors: 5/5 (1 visitor)
Date 29 Dec 2005
Subject Superconductivity
AbstractThe magnetic field dependence of the magnetization was measured above the superconducting transition in a high-Tc underdoped cuprate La1.9Sr0.1CuO4 and in a low-Tc alloy (Pb55In45). Near the superconducting transition [typically for (T-Tc)/Tc<0.05] and under low applied magnetic field amplitudes [typically for H/Hc2(0)<0.01, where Hc2(0) is the corresponding upper critical field extrapolated to T=0 K] the magnetization of both samples presents a diamagnetic contribution much larger than the one predicted by the Gaussian Ginzburg-Landau (GGL) approach for superconducting fluctuations. These anomalies have been already observed in cuprate compounds by various groups and attributed to intrinsic effects associated with the own nature of these high-Tc superconductors. However, we will see here that our results in both high and low-Tc superconductors may be explained quantitatively, and consistently with the GGL behavior observed at higher fields, by just taking into account the presence in the samples of an uniform distribution of Tc inhomogeneities. These Tc inhomogeneities, which may be in turn associated with stoichiometric inhomogeneities, were estimated from independent measurements of the temperature dependence of the field-cooled magnetic susceptibility under low applied magnetic fields.
Source arXiv, cond-mat/0512700
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1 review found:
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1. review 06070042 (3 readers)    * Rate this comment.
Review title: The role of inhomogeneities in the anomalous precursor diamagnetism in HTc
Reviewer: reviewer182
Date: 06 July 2006 at 09:30 GMT.
The work reported in this article deals with the fluctuation-induced precursor diamagnetism above Tc in high-temperatur [...]

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