Tetragonal-orthorhombic structural modulation at low temperature in La[sub 2[minus][ital x]]Ba[sub [ital x]]CuO[sub 4]
Journal Article
·
· Physical Review Letters; (United States)
- Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973 (United States)
Below [similar to]60 K La[sub 2[minus][ital x]]Ba[sub [ital x]]CuO[sub 4] (0.10[le][ital x][le]0.15) reveals superstructure reflections consistent with the tetragonal space group [ital P]4[sub 2]/[ital ncm] [low temperature tetragonal (LTT)]. However, twins, characteristic of the related orthorhombic phase [low temperature orthorhombic (LTO)], persist in this material. Electron microscopy shows that the LTT superstructure reflections originate from the twin-boundary region. This suggests a phase mixture of orthorhombic and tetragonal with a gradual change from LTO (space group [ital Bmab]) in the interior of the two domains, via the [ital Pccn] to LTT at the twin boundary. This is modeled as a spatial modulation, the tipping angle of CuO[sub 6] octahedra being an order parameter.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6736163
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 73:22; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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Conference
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Fri Sep 01 00:00:00 EDT 1995
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OSTI ID:94088
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Journal Article
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OSTI ID:6193142
Local octahedral tilts in La[sub 2[minus][ital x]]Ba[sub [ital x]]CuO[sub 4]: Evidence for a new structural length scale
Journal Article
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Mon Apr 04 00:00:00 EDT 1994
· Physical Review Letters; (United States)
·
OSTI ID:5114037
Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRON MICROSCOPY
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MICROSCOPY
MICROSTRUCTURE
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
TWINNING
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360207 -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
ELECTRON MICROSCOPY
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MICROSCOPY
MICROSTRUCTURE
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
TWINNING