Possible pressure-induced valence changes in Tl sub 2 CaBa sub 2 Cu sub 2 O sub 8 superconductors

Journal Article · Wed Jul 01 00:00:00 EDT 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.46.510· OSTI ID:5000152

Morosin, B; Venturini, E L ^[1]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

The reported nonlinear pressure dependence of the superconducting critical temperature {ital T}{sub {ital c}} in Tl{sub 2}CaBa{sub 2}Cu{sub 2}O{sub 8} can be explained by valence changes deduced from the annealing behavior under various environments for single crystals of several Tl-Ca-Ba-Cu-O structure types. The pressure data are consistent with partial conversion of Tl{sup +} to Tl{sup 3+} with increasing pressure (decreasing {ital c}-axis length), resulting in electron transfer from the Tl-O layers to the Cu-O{sub 2} sheets.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5000152
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 46:1; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
SUPERCONDUCTORS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VALENCE