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Lattice instability and high-T/sub c/ superconductivity in La/sub 2-//sub x/Ba/sub x/CuO/sub 4/

Journal Article · · Phys. Rev. Lett.; (United States)
; ; ; ; ; ;
La/sub 1.85/Ba/sub 0.15/CuO/sub 4/ exhibits high-T/sub c/ superconductivity with an onset temperature near 33 K as measured by resistivity and magnetic susceptibility. The nonsuperconducting end-member compound, La/sub 2/CuO/sub 4/, which has an orthorhombic, Cmca structure, exhibits semiconducting behavior. The orthorhombic distortion is proposed to result from a Peierls 2k/sub F/ instability or a soft zone-boundary phonon mode. The role of Ba is to suppress the instability and stabilize a higher-symmetry tetragonal, I4/mmm structure which is metallic and superconducting.
Research Organization:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
DOE Contract Number:
W-31109-ENG-38
OSTI ID:
6952567
Journal Information:
Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 58:10; ISSN PRLTA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INSTABILITY
LANTHANUM COMPOUNDS
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NEUTRON DIFFRACTION
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
QUASI PARTICLES
RARE EARTH COMPOUNDS
SCATTERING
SUPERCONDUCTIVITY
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE