Suppression of superconductivity in the oxide systems R sub 1 minus x Pr sub x Ba sub 2 Cu sub 3 O sub 7 minus y ( R =Sm, Gd, and Tm)
- Tata Institute of Fundamental Research, Bombay 400 005 (India)
Superconductivity in the 90-K range is observed in most of the orthorhombic {ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} compounds ({ital R} being rare-earth elements and Y). However, the isostructural Pr compound is not superconducting, either due to the 4+ state of Pr whereby the extra electron from Pr fills the Cu-O band, or due to the hybridization of the Pr 4{ital f} states with the O 2{ital p}--Cu 3{ital d} states, or due to a combination of the two. The compounds {ital R}{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} ({ital R}=Sm, Gd, and Tm; 0.0{le}{ital x}{le}1.0) have been prepared and examined for superconductivity. It is observed that the critical Pr concentration required to suppress superconductivity depends on the {ital R} ion, varying from {ital x}{congruent}0.32 in the Sm-Pr system to {ital x}{congruent}0.6 in the Tm-Pr system. Band filling due to Pr{sup 4+} is expected to be nearly the same in all the compounds and cannot solely account for the strong dependence of the critical Pr concentration on {ital R}. Instead, the hybridization mentioned above may explain these results. The {ital T}{sub {ital c}} data are analyzed on the basis of the Abrikosov-Gor'kov pair-breaking theory due to magnetic Pr{sup 3+} ions.
- OSTI ID:
- 5243036
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:13; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360104 -- Metals & Alloys-- Physical Properties
656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GADOLINIUM COMPOUNDS
GADOLINIUM OXIDES
HIGH-TC SUPERCONDUCTORS
HYBRIDIZATION
INHIBITION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM ADDITIONS
PRASEODYMIUM ALLOYS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
SAMARIUM COMPOUNDS
SAMARIUM OXIDES
SAMPLE PREPARATION
STOICHIOMETRY
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THULIUM COMPOUNDS
THULIUM OXIDES
TRANSITION ELEMENT COMPOUNDS