Complete elastic moduli of La[sub 2[minus][ital x]]Sr[sub [ital x]]CuO[sub 4] ([ital x]=0. 00 and 0. 14) near the tetragonal-orthorhombic structural phase transition
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) Department of Physics, University of California, San Diego, La Jolla, California 92093 (United States)
- Institute for Inorganic Synthesis, Yamanashi University, Kofu 4000 (Japan)
We present resonant ultrasound spectroscopy measurements of the complete elastic moduli of La[sub 2[minus][ital x]]Sr[sub [ital x]]CuO[sub 4] ([ital x]=0.00 and 0.14). The [ital x] dependence of both the absolute values of the moduli in the tetragonal phase and the temperature dependences of the moduli near the structural phase transition is weak. In both materials [ital c][sub 44] and 1/2 ([ital c][sub 11][minus][ital c][sub 12]) are unaffected by the transition, [ital c][sub 33] shows a steplike drop broadened by fluctuations, and [ital c][sub 11] and [ital c][sub 66] decrease as 1/([ital T][minus][ital T][sub SPT]) for [ital T][gt][ital T][sub SPT] (where [ital T][sub SPT] is the structural phase transition temperature). We also present measurements of the anisotropic thermal expansion coefficients in La[sub 1.86]Sr[sub 0.14]CuO[sub 4] using a high-resolution capacitance dilatometer. These data when taken together raise serious questions about the standard interpretation of the structural phase transition in La[sub 2[minus][ital x]]Sr[sub [ital x]]CuO[sub 4].
- OSTI ID:
- 6841823
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:18; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
Suppression of the superconducting transition temperature {ital T}{sub {ital c}} around {ital x}{approximately}0.115 in La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4}
Unconventional lattice stiffening in superconducting La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4} single crystals
Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ACOUSTIC TESTING
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELASTICITY
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MATERIALS TESTING
MECHANICAL PROPERTIES
MONOCRYSTALS
NONDESTRUCTIVE TESTING
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
RESONANCE
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TESTING
TRANSITION ELEMENT COMPOUNDS
ULTRASONIC TESTING