Copper NMR and hole depletion in the normal state of Y sub 1-x Pr sub x Ba sub 2 Cu sub 3 O sub 7

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:6899743

MacLaughlin, D E ^[1]; Reyes, A P ^[2]; Takigawa, M; Hammel, P C; Heffner, R H; Thompson, J D ^[3]; Crow, J E ^[4]

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1. California Univ., Riverside, CA (USA)
2. California Univ., Riverside, CA (USA) Los Alamos National Lab., NM (USA)
3. Los Alamos National Lab., NM (USA)
4. Temple Univ., Philadelphia, PA (USA) Florida State Univ., Tallahassee, FL (USA)

Normal-state copper NMR spectra and spin-lattice relaxation rates 1/T{sub 1} have been measured in the planar cuprate system YBa{sub 2}Cu{sub 3}O{sub 7}. With Pr doping the Knight shift K decreases and develops a temperature dependence at both plane and chain sites. 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 {Tc}. The Knight shift behavior resembles that in oxygen-deficient YBa{sub 2}Cu{sub 3}O{sub 7-y}, as does the temperature dependence of 1/T{sub 1} for plane Cu sites and magnetic field perpendicular to the c axis. 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. In the end compound PrBa{sub 2}Cu{sub 3}O{sub 7} the NMR signal from plane Cu sites indicates antiferromagnetic (AF) ordering at a Neel temperature {approximately}280 K, and in the AF state yields an internal field similar to those found in AF YBa{sub 2}Cu{sub 3}O{sub 6} and La{sub 2}CuO{sub 4}. 32 refs., 7 figs.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6899743
• Report Number(s): LA-UR-90-2623; CONF-900751--3; ON: DE90016468
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER 63
COPPER COMPOUNDS
COPPER ISOTOPES
COPPER OXIDES
HIGH-TC SUPERCONDUCTORS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MAGNETISM
NMR SPECTRA
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
RELAXATION
SPECTRA
SPIN-LATTICE RELAXATION
STABLE ISOTOPES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS