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Title: Structural instability in single crystals of the high-T/sub c/ superconductor La/sub 2-//sub x/ Sr/sub x/ CuO/sub 4/

Single crystals superconducting La/sub 2-//sub x/Sr/sub x/CuO/sub 4/ (xapprox.0.08)= have been investigated in the temperature range 15--298 K and are found to undergo a structural phase transition below room temperature, but above 180 K. Detailed analysis of the diffraction-peak profiles obtained below the transition temperature indicates a breakup of the macroscopic crystals into multiple domains of different orientations. Several cooling and warming cycles always reverse the samples into one-domain single crystals at room temperature. Complicated peak profiles prevent the determination of the exact symmetry and structure below the phase transition.
Authors:
; ; ; ; ; ;
Publication Date:
OSTI Identifier:
6089979
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys. Rev. B: Condens. Matter; (United States); Journal Volume: 35:13
Research Org:
Chemistry and Materials Science Divisions, Argonne National Laboratory, Argonne, Illinois 60439
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COPPER OXIDES; CRYSTAL-PHASE TRANSFORMATIONS; LANTHANUM OXIDES; STRONTIUM OXIDES; INSTABILITY; ION TEMPERATURE; MONOCRYSTALS; SUPERCONDUCTORS; THERMAL CYCLING; TRANSITION TEMPERATURE; X-RAY DIFFRACTION; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; COPPER COMPOUNDS; CRYSTALS; DIFFRACTION; LANTHANUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; STRONTIUM COMPOUNDS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS 360202* -- Ceramics, Cermets, & Refractories-- Structure & Phase Studies; 656100 -- Condensed Matter Physics-- Superconductivity