Stability of the low-temperature tetragonal phase in La[sub 2[minus]x]Ba[sub x]CuO[sub 4] and related compounds
- Hiroshima Univ. (Japan)
In La[sub 2[minus]x]Ba[sub x]CuO[sub 4] (LBCO), the structural transition to a low-temperature tetragonal phase below 60 K and suppression of superconductivity are observed when the carrier density is p [approximately] 1/8 per copper. The replacement by divalent ions smaller than Ba[sup 2+] suppresses the static deformation of the lattice. We have found that the variations T[sub d2], and superconducting transition temperature Tc are quantitatively characterized by the averaged ionic radius at the La site or lattice parameters. This aspect of substitution could be regarded as the effect of chemical pressure, since similar variations have been reported on applying hydrostatic pressure. In La[sub 2[minus]x[minus]y]Nd[sub y](Ba, Sr)[sub x]CuO[sub 4], T[sub d2] increases with increasing y in a wide range of p while Tc is suppressed only at p approximately 1/8. The structural transition at T[sub d2] here should be ascribed mainly to the crystallochemical origin. 12 refs., 2 figs.
- OSTI ID:
- 7070524
- Report Number(s):
- CONF-930710-; CODEN: JOUSEH; TRN: 94-014463
- Journal Information:
- Journal of Superconductivity; (United States), Vol. 7:1; Conference: Physics and chemistry of molecular and oxide superconductors conference, Eugene, OR (United States), 27-31 Jul 1993; ISSN 0896-1107
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL-PHASE TRANSFORMATIONS
PRESSURE DEPENDENCE
CUPRATES
SUPERCONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
CARRIER DENSITY
CRYSTAL STRUCTURE
TETRAGONAL LATTICES
DEFORMATION
STABILITY
BARIUM COMPOUNDS
CRYSTALLOGRAPHY
LANTHANUM COMPOUNDS
STRONTIUM COMPOUNDS
TEMPERATURE RANGE 0013-0065 K
ALKALINE EARTH METAL COMPOUNDS
COPPER COMPOUNDS
CRYSTAL LATTICES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
360607* - Other Materials- Superconducting Properties- (1992-)
665411 - Basic Superconductivity Studies- (1992-)