Anisotropy of the thermal conductivity of YBa sub 2 Cu sub 3 O sub 7 minus y

• Published in: Physical review. B, Condensed matter Vol. 40:13
• Main Authors: Hagen, S.J., Wang, Z.Z., Ong, N.P.
• Format: Journal Article
• Language: English
• Published: United States 01-11-1989
• Subjects: 360204 - Ceramics, Cermets, & Refractories- Physical Properties; ALKALINE EARTH METAL COMPOUNDS; ANISOTROPY; BARIUM COMPOUNDS; BARIUM OXIDES; BASIC INTERACTIONS; CHALCOGENIDES; COPPER COMPOUNDS; COPPER OXIDES; ELECTROMAGNETIC INTERACTIONS; ELECTRON-PHONON COUPLING; INTERACTIONS; LOW TEMPERATURE; MATERIALS SCIENCE; MEDIUM TEMPERATURE; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SCATTERING; THERMAL CONDUCTIVITY; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; ULTRALOW TEMPERATURE; UMKLAPP PROCESSES; VERY LOW TEMPERATURE; YTTRIUM COMPOUNDS; YTTRIUM OXIDES
• ISSN: 0163-1829; 1095-3795
• DOI: 10.1103/PhysRevB.40.9389

The thermal conductivity, both in-plane ({kappa}{sub {ital ab}}) and out-of-plane ({kappa}{sub {ital c}}), has been measured in 90-K'' crystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} from 10 to 330 K. {kappa}{sub {ital ab}} displays an 18 to 40% increase below the transition temperature {ital T}{sub {ital c}} (as in ceramic data). {kappa}{sub {ital c}}, however, is four to five times smaller and shows no anomaly at {ital T}{sub {ital c}}. Comparing these results to {kappa}{sub {ital ab}} of insulating crystals, we find evidence for very strong but highly anisotropic electron-phonon coupling in the normal state. Our results are consistent with a phonon origin for the peak in {kappa}{sub {ital ab}}.