sup 63 Cu NMR and hole depletion in the normal state of yttrium-rich Y sub 1 minus x Pr sub x Ba sub 2 Cu sub 3 O sub 7

Journal Article · Fri Feb 01 00:00:00 EST 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.43.2989· OSTI ID:5844998

Reyes, A P; MacLaughlin, D E ^[1]; Takigawa, M; Hammel, P C; Heffner, R H; Thompson, J D ^[2]; Crow, J E ^[3]

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1. University of California, Riverside, California 92521-0413 (USA)
2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (USA)
3. Temple University, Philadelphia, Pennsylvania 19122 (USA) Florida State University, Tallahassee, Florida 32306 (USA)

The {sup 63}Cu Knight shift {ital K} and spin-lattice relaxation rate 1/{ital T}{sub 1} have been measured in the superconducting cuprate system Y{sub 1{minus}{ital x}}Pr{sub {ital x}}Ba{sub 2}Cu{sub 3}O{sub 7}, 0.05{le}{ital x}{le}0.20. With Pr doping {ital K} decreases and develops a temperature dependence at both plane and chain sites. This resembles the behavior of the Cu and Y Knight shifts as well as the bulk susceptibility in oxygen-deficient YBa{sub 2}Cu{sub 3}O{sub 7{minus}{ital y}}. The orbital contribution to {ital K} and the anisotropy of the Cu hyperfine coupling remain essentially unchanged over the entire Pr concentration range. No appreciable direct effect of Pr magnetism on the conduction-band susceptibility was found. Instead, analysis of the bulk susceptibility and NMR data indicate that pair breaking and hole depletion both take part in the suppression of the superconducting transition temperature {ital T}{sub {ital c}}. The temperature dependence of 1/{ital T}{sub 1} for magnetic field parallel to the {ital c} axis is also similar to that for the oxygen-deficient compound. This agreement leads to a consistent picture of the role of antiferromagnetic fluctuations in these materials. An analysis of the data in the framework of the phenomenological theory of Millis, Monien, and Pines is given.

• OSTI ID: 5844998
• Journal Information: Physical Review, B: Condensed Matter; (USA), Vol. 43:4; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
NUCLEAR MAGNETIC RESONANCE
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
YTTRIUM OXIDES
KNIGHT SHIFT
LOW TEMPERATURE
MAGNETIC SUSCEPTIBILITY
PRASEODYMIUM ADDITIONS
SPIN-LATTICE RELAXATION
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
MAGNETIC PROPERTIES
MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM ALLOYS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RELAXATION
RESONANCE
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties