Elastic anomalies and phase transitions in high-T/sub c/ superconductors

Journal Article · Mon Mar 21 00:00:00 EST 1988 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.60.1181· OSTI ID:5288585

Bhattacharya, S; Higgins, M J; Johnston, D C; Jacobson, A J; Stokes, J P; Goshorn, D P; Lewandowski, J T

Ultrasound propagation in both known classes of high-T/sub c/ ceramic superconductors reveals the presence of an anomaly above T/sub c/, at T/sub s/approx. =95 K in La/sub 1.8/Sr/sub 0.2/CuO/sub 4/..sqrt../sub y/ and approx. =120 K in YBa/sub 2/Cu/sub 3/O/sub 7/..sqrt../sub delta/, suggesting that the state between T/sub s/ and T/sub c/ is the ''normal'' state preceding superconductivity. The anomalous elastic behavior at and below T/sub c/ is dominated by the shear modulus and not by the bulk modulus, implying an unusually strong coupling of the order parameter to shear distortions. Implications of these results for superconductivity are discussed

• Research Organization: Corporate Research Science Laboratories, Exxon Research and Engineering Company, Annandale, New Jersey 08801
• OSTI ID: 5288585
• Journal Information: Phys. Rev. Lett.; (United States), Vol. 60:12
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
ELASTICITY
COPPER OXIDES
LANTHANUM OXIDES
STRONTIUM OXIDES
SUPERCONDUCTORS
YTTRIUM OXIDES
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LOW TEMPERATURE
POLYCRYSTALS
ULTRASONIC WAVES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
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LANTHANUM COMPOUNDS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RARE EARTH COMPOUNDS
SOUND WAVES
STRONTIUM COMPOUNDS
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
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