Pressure dependence of T sub c and charge transfer in YBa sub 2 Cu sub 3 O sub x (6. 35 le x le 7) single crystals

Journal Article · Mon Jul 27 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.680· OSTI ID:7293021

Almasan, C C; Han, S H; Lee, B W; Paulius, L M; Maple, M B; Veal, B W; Downey, J W; Paulikas, A P; Fisk, Z; Schirber, J E ^[1]

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1. Department of Physics and Institute for Pure and Applied Physical Sciences, University of California, San Diego, La Jolla, California 92093 (United States) Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States) Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States) Sandia National Laboratories, Albuquerque, New Mexico 87185-5800 (United States)

The superconducting critical temperature {ital T}{sub {ital c}} of YBa{sub 2}Cu{sub 3}O{sub {ital x}} single crystals (6.35{approx lt}{ital x}{approx lt}7) has been measured resistively as a function of pressure {ital P} (0{le}{ital P}{approx lt}20 kbar). The initial rate {ital dT}{sub {ital c}}/{ital dP} exhibits three distinct regimes, a narrow plateau near {ital x}{approx}7 with {ital dT}{sub {ital c}}/{ital dP}{approx}0.04 K/kbar, a plateau in the range 6.4{approx lt}{ital x}{approx lt}6.8, where {ital dT}{sub {ital c}}/{ital dP}{approx}0.43 K/kbar, and a maximum value {similar to}0.8 K/kbar at {ital x}{approx}6.35. An analysis of the {ital T}{sub {ital c}}({ital x},{ital P}) data using a phenomenological model yields a pronounced peak near {ital x}=6.8 in {ital d}{Delta}{ital n}{sub {ital h}}({ital x})/{ital dP}, where {Delta}{ital n}{sub {ital h}}({ital x}) is the change in the hole density in the CuO{sub 2} planes relative to the value corresponding to the fully oxygenated sample.

• DOE Contract Number: FG03-86ER45230; W-31109-ENG-38; AC04-76DP00789
• OSTI ID: 7293021
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:4; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHARGE TRANSPORT
CHEMICAL COMPOSITION
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON TRANSFER
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
STOICHIOMETRY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES