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Title: Transport properties of La2-xSrxCuO4 epitaxial thin films in high magnetic fields
Authors: Wambecq, T
Vanacken, J
Stroobants, S
Weckhuysen, L
Mashkautsan, V
WAGNER, Patrick 
Moshchalkov, VV
Issue Date: 2004
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,
Keywords: high temperature superconductivity; magnetoresistance; metal-insulator transition; psuedogap
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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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