Volume 58, Number 1, April 2002
|Page(s)||105 - 111|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 August 2002|
Transport properties of the underdoped films in high magnetic fields
National Laboratory for Superconductivity
Institute of Physics & Center
for Condensed Matter Physics Chinese Academy of Sciences -
Beijing 100080, PRC
2 Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven Celestijnenlaan 200 D, B-3001 Leuven, Belgium
Accepted: 10 January 2002
The effect of magnetic field and disorder on the transport properties of the underdoped films has been investigated in a broad temperature range in magnetic fields up to 50. In ultrathin films with strong disorder, where the mean free path l corresponds to , a convincing power law resistivity vs. temperature (–0.39) is observed in a very broad temperature range –40. However, in superconducting thicker films with much weaker disorder ( in normal state), the high magnetic field, by suppressing superconductivity, recovers the normal-state transport behavior with the -dependence at low temperature in field. The two different transport behaviors indicate that the normal-state transport properties of the underdoped cuprates are very sensitive not only to the hole concentration but also to the degree of the disorder.
PACS: 74.25.Fy – Transport properties (electric and thermal conductivity, thermoelectric effects, etc.) / 74.76.Bz – High- films / 74.72.Bk – Y-based cuprates
© EDP Sciences, 2002
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