Published 1987 | Version v1
Book Metadata-only

Ultrasound studies of (La,Sr)/sub 2/CuO/sub 4/ and YBa/sub 2/Cu/sub 3/O/sub 7/

Creators

  • 1. AT and T Bell Labs., Murray Hill, NJ

Description

The authors measure the changes in sound velocity in the two high T/sub c/ superconductors (La,Sr)/sub 2/CuO/sub 4/ and YB/sub 2/Cu/sub 3/O/sub 7/ from room temperature through superconducting transitions. Both systems exhibit anomalous behavior at T/sub c/. In a conventional superconductor at T/sub c/ there is a small drop in the sound velocity typically of order a few ppm and the sound velocity at T=0 stays below its value at T/sub c/. In La/sub 1.85/Sr/sub 15/CuO/sub 4/ there is a large drop (--150ppm) at T/sub c/ and then a large hardening below T/sub c/ of --1000ppm. In YBa/sub 2/Cu/sub 3/O/sub 7/ there is no drop at T/sub c/ but it also exhibits a large hardening below T/sub c/ of --1000ppm. This behavior is shown in Figure 1 for La/sub 1.85/Sr/sub 15/CuO/sub 4/ and Figure 2 for Ba/sub 2/YCu/sub 3/O/sub 7/

Additional details

Publishing Information

Publisher
Materials Research Society.
Imprint Place
Pittsburgh, PA (USA)
Imprint Title
Proceedings of symposium S at the 1987 Spring meeting of the MRS on high temperature superconductors (Extended Abstracts)
Journal Page Range
p. 111-114.

Conference

Title
Spring meeting of the Materials Research Society.
Dates
21-25 Apr 1987.
Place
Anaheim, CA (USA).

INIS

Country of Publication
United States
Country of Input or Organization
United States
INIS RN
18094140
Subject category
S36: MATERIALS SCIENCE;
Resource subtype / Literary indicator
Conference
Descriptors DEI
BARIUM OXIDES; COPPER OXIDES; LANTHANUM OXIDES; PHASE STUDIES; STRONTIUM OXIDES; SUPERCONDUCTIVITY; TRANSITION TEMPERATURE; ULTRASONIC TESTING; ULTRASONIC WAVES; VELOCITY; YTTRIUM OXIDES
Descriptors DEC
ACOUSTIC TESTING; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; LANTHANUM COMPOUNDS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SOUND WAVES; STRONTIUM COMPOUNDS; TESTING; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS