Title: Transport properties at the insulator-superconductor phase boundary of La2-xSrxCuO4 thin films
Authors: Wagner, P
Ruan, KQ
Gordon, Ivan
Vanacken, Johan
Moshchalkov, Victor
Bruynseraede, Yvan #
Issue Date: Jul-2001
Publisher: Elsevier science bv
Series Title: Physica C vol:356 issue:1-2 pages:107-114
Abstract: The longitudinal resistivity and the transverse Hall resistivity of La1.94Sr0.06CuO4 and La1.97Sr0.03CuO4 epitaxial thin films are investigated. The zero-field resistivity rho (T) of La1.94Sr0.06CuO4 shows a minimum at 80 K and a resistive midpoint of the superconducting transition at T-c(mid) approximate to 7.5 K. A magnetic field of 8 T suppresses the superconducting state and induces a semiconducting normal state with rho (T) increasing with decreasing temperature. The resistivity of La1.97Sr0.03CuO4 has a minimum at 100 K and no superconducting transition is observed down to 1.5 K. The semi conducting low-temperature behaviour can be described by Shlovskii-Efros hopping, while the metallic-like regime corresponds to 1D quantum transport of charge stripes. The field dependence of the Hall resistivity rho (xy)(B) has an opposite behaviour for the two doping levels: the rho (xy)(B) slope of La1.94Sr0.06CuO4 decreases with decreasing temperature, while it increases in the case of La1.97Sr0.03CuO4. Within the superconducting transition regime of La1.94Sr0.06CuO4 (below 15 K) we observe a sign inversion of rho (xy)(B) in the limit of weak magnetic fields. (C) 2001 Elsevier Science B.V. All rights reserved.
ISSN: 0921-4534
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Solid State Physics and Magnetism Section
# (joint) last author

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