Elastic softening and internal friction in La sub 2 minus x Sr sub x CuO sub 4
- Henry Krumb School of Mines, Columbia University, New York, New York 10027 (US)
The Young's modulus {ital E} and the internal friction of polycrystalline ceramic La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4} were measured over the composition range 0.05{le}{ital x}{le}0.30. A striking elastic constant anomaly, reported previously, was observed, in which {ital E} falls by 40% or more and the internal friction increases with decreasing temperature. The temperature region of the elastic softening falls rapidly with increasing Sr concentration {ital x} and occurs near the tetragonal-orthorhombic ({ital T}-{ital O}) transition temperature. The soft'' modulus does not recover at lower temperatures but persists to at least {similar to}100 K. This elastic softening and the accompanying internal friction are attributed to stress-induced migration of martensitic domain boundaries produced by the {ital T}-{ital O} transition. It is also found that there is no correlation between the elastic softening and the occurrence of superconductivity.
- DOE Contract Number:
- FG02-88ER45341
- OSTI ID:
- 7224848
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:1; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
ELASTICITY
FRICTION
INTERNAL FRICTION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MECHANICAL PROPERTIES
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLYCRYSTALS
QUANTITY RATIO
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS