Structural effects of hydrostatic pressure in orthorhombic La[sub 2[minus][ital x]]Sr[sub [ital x]]CuO[sub 4]
- Institute for Solid State Physics, University of Tokyo, 7-22-1 Roppongi, Tokyo 106 (Japan)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
We have investigated the effect of hydrostatic pressure on the structure of orthorhombic La[sub 2[minus][ital x]]Sr[sub [ital x]]CuO[sub 4] between 1 atm and 0.6 GPa, using neutron powder diffraction. Increasing pressure causes the tilt angle of CuO[sub 6] octahedra to decrease, leading to a transition to tetragonal symmetry. There is a strong compressibility anisotropy for the orthorhombic structure. Order parameters for the transition versus pressure are consistent with Landau theory for a second-order transition. It is shown that this transition can be universally scaled over ([ital x],[ital T],[ital P]) space in the context of Landau theory. We conclude that [ital T][sub [ital c]] varies inversely with the tilt angle and is maximum for the tetragonal structure, i.e., for flat and square CuO[sub 2] planes, for this compound.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7174818
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:5; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
CHALCOGENIDES
COHERENT SCATTERING
COMPRESSIBILITY
COPPER COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUPRATES
DIFFRACTION
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MECHANICAL PROPERTIES
MEDIUM PRESSURE
NEUTRON DIFFRACTION
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
RARE EARTH COMPOUNDS
SCATTERING
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VERY HIGH PRESSURE