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Title: Influence of fluctuation conductivity on the high-field magnetoresistivity in epitaxial La2-xSrxCuO4 thin films
Authors: Vanacken, J
Weckhuysen, L
Wambecq, T
Mashkautsan, V
WAGNER, Patrick 
Moshchalkov, VV
Issue Date: 2004
Source: PHYSICA B-CONDENSED MATTER, 346. p. 339-343
Abstract: A large positive magnetoresistivity (up to tens of percents) is observed for underdoped superconducting La2-xSrxCuO4 epitaxial thin films at temperatures far above the superconducting critical temperature. T-c. For the underdoped samples, this magnetoresistance far above T-c cannot be described solely by the Kohler effect and we believe it is to be attributed to the influence of superconducting fluctuations or the existence of preformed pairs. In the underdoped regime, the large magnetoresistance is only observed when low-temperatures superconductivity occurs. The strong magnetoresistivity, which persists even at temperatures far above T-c, can be related to the pairs forming the superconducting phase below T-c. Our observations support the idea of a close relation between the pseudogap and the superconducting gap and provide new indications for the presence of pairs above T-c. (C) 2004 Elsevier B.V. All rights reserved.
Notes: Katholieke Univ Leuven, Vaste Stof Fys & Magnetisme Lab, B-3001 Louvain, Belgium. Lab Natl Champs Magnet Pulses, F-31432 Toulouse, France. Limburgs Univ Ctr, Inst Mat Londerzooek, B-3590 Diepenbeek, Belgium.Vanacken, J, Katholieke Univ Leuven, Vaste Stof Fys & Magnetisme Lab, Celestijnenlaan 200D, B-3001 Louvain,
Keywords: high-temperature superconductivity; fluctuation conductivity; magnetoresistance
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ISSN: 0921-4526
e-ISSN: 1873-2135
DOI: 10.1016/j.physb.2004.01.102
ISI #: 000221271400071
Category: A1
Type: Journal Contribution
Validations: ecoom 2005
Appears in Collections:Research publications

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