Anisotropy of the normal state resistivity and susceptibility of untwinned YBa sub 2 Cu sub 3 O sub 7 minus. delta. single crystals

Conference · Mon Apr 01 04:00:00 EST 1991 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5131673

Welp, U ^[1]; Kwok, W K ^[2]; Fleshler, S ^[3]; Vandervoort, K G ^[4]; Downey, J; Fang, Y; Crabtree, G W ^[2]; Liu, J Z ^[5]

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1. Science Technology Center for Superconductivity and Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
3. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) Department of Physics, Purdue University, West Lafayette, Indiana 47907 (United States)
4. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) Department of Physics, University of Illinois at Chicago, Chicago, Illinois 60680 (United States)
5. Department of Physics, University of California-Davis, Davis, California 95616 (United States)

We present measurments of the {bold a}-{bold b} anisotropy of the normal state resistivity {rho}{sub a}/{rho}{sub b} and measurements of the normal state magnetization along the three crystal axes. {rho}{sub a}/{rho}{sub b} increases with increasing temperature and reaches a (sample dependent) value of 1.2 to 1.85 near room temperature. The results show that the CuO chains are metallic and that they can have a conductivity comparable to that one of the CuO{sub 2} planes. A model of a parallel circuit of planes and chains is used to analyse the data. Superconducting fluctuations are found to be much more pronounced in the planes than in the chains. The normal state susceptibility shows the onset of strong diamagnetic fluctuations at temperatures below 200 K. At higher temperatures the anisotropy {chi}{sub c}{gt}{sigma}{sub a}{gt}{sigma}{sub b} is observed and compared to predictions based on a model of local Cu-moments in the planes and chains.

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5131673
• Report Number(s): CONF-900990--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 219:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HIGH-TC SUPERCONDUCTORS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES