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Evidence for peroxide formation in superconducting YBa/sub 2/. sqrt. /sub x/La/sub x/Cu/sub 3/O/sub 7//sub +- //sub delta/

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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The sysetm YBa/sub 2/..sqrt../sub x/La/sub x/Cu/sub 3/O/sub 7//sub +- //sub delta/(0less than or equal toxless than or equal to0.5), annealed to a maximum oxygen concentration under 1 atm of O/sub 2/, exhibits three distinct compositional ranges. (1) For 0less than or equal tox<0.05, the maximum oxygen concentration is O/sub 6.94 + 0.5//sub x/;the intercalated oxygen atoms are monomeric and T/sub c/ increases to 99 K at x = 0.05. (2) For 0.10less than or equal tox<0.5, the maximum oxygen concentration is O/sub 6.85 + 0.5//sub x/;beyond xapprox. =0.07 the additional oxygen appear to be intercalated as peroxide ions and T/sub c/ decreases linearly with x through a smooth orthorhombic-tetragonal phase transition at x = 0.30. (3) For 0.05less than or equal tox<0.10, a transition between the two regimes occurs

Research Organization:
Center for Materials Science and Engineering, ETC 5.160, University of Texas at Austin, Austin, Texas 78712-1084
OSTI ID:
5251093
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 37:7; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
CRYSTAL STRUCTURE
DIFFRACTION
ELEMENTS
HEAT TREATMENTS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
SCATTERING
STOICHIOMETRY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VALENCE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES