Resistivity and Hall effect of metallic oxygen-deficient YBa{sub 2}Cu{sub 3}O{sub {ital x}} films in the normal state
- Laboratorium voor Vaste-Stoffysica en Magnetisme, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven (Belgium)
We present a systematic study of normal-state transport properties in a series of {ital c}-axis-oriented YBa{sub 2}Cu{sub 3}O{sub {ital x}} (YBCO) epitaxial thin films and YBa{sub 2}Cu{sub 3}O{sub 7}/PrBa{sub 2}Cu{sub 3}O{sub 7} (YBCO/PrBCO) superlattices. The hole doping level in the YBCO films is varied from the optimum-doped metallic down to the underdoped insulating regime by changes in the oxygen content {ital x}. We find that the magnitude of the resistivity {rho} and Hall coefficient {ital R}{sub {ital H}} increases monotonically with decreasing {ital x} and that their respective temperature dependences undergo marked changes. The {ital R}{sub {ital H}}({ital T}) behavior is reminescent of the Hall effect behavior in heavy fermion metals, taking into account a difference in temperature by a factor of 100. The Hall angle cot{theta}{sub {ital H}}={rho}/{ital R}{sub {ital HB}} shows a quadraticlike temperature dependence, with systematic deviations at high and low doping levels. Transport measurements in YBCO/PrBCO superlattices, with the YBCO layers in the two-dimensional regime, indicate that the deviations of a {ital T}{sup 2} dependence of the Hall angle are intrinsic and not related to the dimensionality of the system. A method of analyzing the transport data is presented, revealing a striking scaling behavior of the respective properties. A comparison with reported transport data in the literature suggests that the observed scaling behavior may be universal for underdoped cuprates. Furthermore, we show that reported NMR Knight shift data for oxygen-deficient YBCO samples can also be mapped on a single scaling curve, by using the same scaling parameter derived from our transport measurements. This finding strongly indicates that the dominant scattering mechanism in these materials is of magnetic origin. (Abstract Truncated)
- OSTI ID:
- 280204
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 14 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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