Superconductivity under high pressure of YBa sub 2 (Cu sub 1 minus x M x ) sub 3 O sub 7 minus. delta. ( M =Fe, Co, Al, Cr, Ni, and Zn)
- Physics Department, Virginia Commonwealth University, Richmond, Virginia 23284 (USA)
- Materials Science Division, Brookhaven National Laboratory, Upton, New York 11973 (USA)
A survey of the superconducting transition temperature {ital T}{sub {ital c}} of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} (1:2:3) and related superconductors as a function of pressure {ital p}({le}17 kbar) was made. Well-characterized samples, among them fully oxidized and oxygen-reduced 1:2:3 and Cu-substituted YBa{sub 2}(Cu{sub 1{minus}{ital x}M{ital x}}){sub 3}O{sub 7{minus}{delta}} ({ital M}=Fe, Co, Al, Cr, Ni, and Zn), were prepared according to published methods. Small pieces ({similar to}100 mg) of the samples were measured for superconductivity using an ac mutual inductance method. For YBa{sub 2}Cu{sub 3}O{sub 7} little pressure dependence is observed ({ital dT}{sub {ital c}}/{ital dp}={minus}0.01{plus minus}0.02 K/kbar), in agreement with most previous work. However, with substitutions {ital M}=Fe, Co, or Al, a significant positive pressure dependence of {ital T}{sub {ital c}} is observed, increasing with increasing {ital M} content. For {ital M}=Zn and Ni there is little pressure dependence of {ital T}{sub {ital c}}. For an oxygen-reduced sample ({delta}=0.2){ital T}{sub {ital c}} increases with pressure.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 6883935
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:13; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTS
IMPURITIES
METALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSURE EFFECTS
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
TRANSITION TEMPERATURE
VERY HIGH PRESSURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES