Published 1989 | Version v1
Book Metadata-only

Anomalous Poisson ratio and bulk modulus in high-Tc superconductors

Creators

  • 1. Physikalisches Institut, RWTH Aachen. (Germany, F.R.)
  • 2. Philips GmbH, Forschungslaboratorium Aachen, D-5100 Aachen. (Germany, F.R.)

Description

Longitudinal and transverse sound velocity and attenuation measurements as function of temperature and frequency have been carried out in well characterized ceramic YBa2Cu3Ox samples of different oxygen content but the same controlled microstructure. At the occurrence of superconductivity we found a pronounced steplike behavior in both bulk modulus and Poisson ratio. Together with a general decrease towards higher oxygen content an effect of 15% is observed. Both effects are discussed in connection with the mixed valence of the Cu-3d electrons. Thermally activated relaxation processes in the sound attenuation are systematically studied in dependence of oxygen content. The derived activation energy shows a dependence on oxygen content which is attributed to oxygen vacancy ordering in the basal plane

Additional details

Publishing Information

Publisher
Elsevier Science Pub. Co., Inc.
Imprint Place
New York, NY (USA)
Imprint Title
Proceedings of the international conference on materials and mechanisms of superconductivity. High temperature superconductors II. Part 1-2
Imprint Pagination
1744 p.
Journal Page Range
p. 452-453.

Conference

Title
International conference on materials and mechanisms of superconductivity - high-temperature superconductors II.
Dates
23-28 Jul 1989.
Place
Stanford, CA (USA).

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
21057406
Subject category
S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Conference
Descriptors DEI
ATTENUATION; BARIUM OXIDES; CERAMICS; CRYSTAL-PHASE TRANSFORMATIONS; CUPRATES; EXCITATION; POISSON RATIO; SUPERCONDUCTIVITY; TRANSITION TEMPERATURE; YTTRIUM OXIDES
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ENERGY-LEVEL TRANSITIONS; MECHANICAL PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS

Optional Information

Secondary number(s)
CONF-890718--.