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|Title:||Transport properties of La2-xSrxCuO4 epitaxial thin films in high magnetic fields||Authors:||Wambecq, T
|Issue Date:||2004||Publisher:||ELSEVIER SCIENCE BV||Source:||PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 404(1-4). p. 405-409||Abstract:||We have investigated the magnetotransport of La2-xSrxCuO4 (0.045 less than or equal to x less than or equal to 0.25) epitaxial thin films in pulsed fields up to mu(0)H = 50 T. Above a certain temperature T*, the temperature dependence of the resistivity rho(T) is linear and between T* and the superconducting critical temperature T-c, rho(T) is superlinear. This observation is universal for all underdoped films. The high field data rho(T, H-0) from underdoped and slightly overdoped samples reveal a metal-to-insulator like transition (MIT) at low temperatures. We have determined the detailed dependence of the minimum in the rho(T) curves as a function of the Sr-content x. The MIT can be analyzed by calculating the k(F)l product from the resistivity data; here k(F) is the Fermi wave vector and l is the mean free path. We can describe the insulating behavior at low temperatures of samples with k(F)l < 1 by a variable range hopping conductivity. For samples where k(F)l > 1 the divergence of the resistivity follows a power (T-x(alpha > 0)) or a logarithmic In(l/T)) law, depending on the Sr-content. This p(T) divergence is probably associated with the formation of the pseudogap and the pinning of the fragmented charge stripes at low temperatures. (C) 2004 Elsevier B.V. All rights reserved.||Notes:||Katholieke Univ Leuven, Nanoscale Superconduct & Magnetism, Pulsed Fields Grp, Lab Vaste Stoffys & Magnetisme, B-3001 Leuven, Belgium. Lab Natl Champs Magnet Pulses, F-31432 Toulouse, France. Limburgs Univ Ctr, Inst Mat Onderzoek, B-3590 Diepenbeek, Belgium.Wambecq, T, Katholieke Univ Leuven, Nanoscale Superconduct & Magnetism, Pulsed Fields Grp, Lab Vaste Stoffys & Magnetisme, Celestijnenlaan 200 D, B-3001 Leuven, Belgium.firstname.lastname@example.org||Keywords:||high temperature superconductivity; magnetoresistance; metal-insulator transition; psuedogap||Document URI:||http://hdl.handle.net/1942/2395||ISSN:||0921-4534||e-ISSN:||1873-2143||DOI:||10.1016/j.physc.2004.01.019||ISI #:||000221211500075||Category:||A1||Type:||Journal Contribution||Validations:||ecoom 2005|
|Appears in Collections:||Research publications|
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