Direct measurement of the anisotropy of the resistivity in the a - b plane of twin-free, single-crystal, superconducting YBa sub 2 Cu sub 3 O sub 7 minus. delta

Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.6217· OSTI ID:6192949

Friedmann, T A; Rabin, M W; Giapintzakis, J; Rice, J P; Ginsberg, D M ^[1]

---

1. Department of Physics, University of Illinois at Urbana-Champaign, Urbana IL (USA) Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, IL (USA)

We have measured the resistivity tensor in one nearly twin-free crystal and one twin-free crystal of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. The first crystal was grown with a large twin-free region. We removed the twins in the second crystal by applying a uniaxial stress. Using a modified Montgomery technique, we measured the electrical resistivities in all three crystal directions and found them to be linear in temperature above the superconducting transition temperature {ital T}{sub {ital c}}. Our results for {rho}{sub {ital a}} and {rho}{sub {ital b}} at room temperature are among the lowest that have been reported in the literature, indicating that our samples are of high quality. The ratio {rho}{sub {ital a}}/{rho}{sub {ital b}} is independent of temperature between 150 and 275 K, and its value, 2.2{plus minus}0.2, indicates that the Cu-O chains contribute 60% of the current when the electric field is parallel to them, with the rest of the current being contributed by the Cu-O planes. This result, at zero frequency, is in good agreement with the recent conductivity at infrared frequencies obtained by Schlesinger {ital et} {ital al}.

• OSTI ID: 6192949
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 42:10; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
ELECTRIC CONDUCTIVITY
COPPER OXIDES
YTTRIUM OXIDES
ANISOTROPY
LOW TEMPERATURE
MEDIUM TEMPERATURE
PEROVSKITE
STRAINS
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
TWINNING
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
ELECTRICAL PROPERTIES
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties
656100 - Condensed Matter Physics- Superconductivity