Suppression of superconductivity in Gd sub 1 minus x Pr sub x Ba sub 2 Cu sub 3 O sub 7 minus y and R sub 0. 8 Pr sub 0. 2 Ba sub 2 Cu sub 3 O sub 7 minus y

Journal Article · Wed May 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.10568· OSTI ID:5692163

Yang, H D; Chen, P F; Hsu, C R; Lee, C W; Li, C L; Peng, C C ^[1]

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1. Department of Physics, National Sun Yat-Sen University, Kaohsiung, Taiwan 80424, Republic of China (CN)

The superconductive and magnetic properties of compounds in Gd{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} (0{le}{ital x}{le}1.0) and {ital R}{sub 0.8}Pr{sub 0.2}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} ({ital R}=Y and rare-earth elements) have been investigated by means of x-ray-diffraction, electrical-resistivity, and magnetic-susceptibility measurements. No obvious discrepancies were found between Gd{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} and Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} from the structural and magnetic analysis. The depression of {ital T}{sub {ital c}} by the Pr concentration can be described by the Abrikosov and Gor'kov pair-breaking-like relation, while the critical concentration {ital x}{sub cr} is considerably lower in Gd{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} than in Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}}. In the {ital R}{sub 0.8}Pr{sub 0.2}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} system, the {Delta}{ital T}{sub {ital c}} ({Delta}{ital T}{sub {ital c}}={ital T}{sub {ital c}}({ital R}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}}){minus}{ital T}{sub {ital c}} ({ital R}{sub 0.8}Pr{sub 0.2}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}})) strongly depends on the ionic radius of rare-earth elements. This suggests that the hybridization between Pr 4{ital f} states and conduction bands may play an important role in the quenching of superconductivity in the PrBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}} system.

• OSTI ID: 5692163
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ELECTRONIC STRUCTURE
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COPPER OXIDES
GADOLINIUM OXIDES
PRASEODYMIUM OXIDES
YTTRIUM OXIDES
HIGH-TC SUPERCONDUCTORS
HYBRIDIZATION
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ALKALINE EARTH METAL COMPOUNDS
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GADOLINIUM COMPOUNDS
OXIDES
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RARE EARTH COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
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