Neutron scattering study of the magnetic excitations in metallic and superconducting La sub 2 minus x Sr sub x CuO sub 4 minus y

Journal Article · Fri Sep 01 04:00:00 EDT 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.4585· OSTI ID:5650389

Thurston, T R; Birgeneau, R J; Kastner, M A; Preyer, N W ^[1]; Shirane, G; Fujii, Y ^[2]; Yamada, K; Endoh, Y; Kakurai, K; Matsuda, M ^[3]; others, and

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1. Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (US)
2. Physics Department, Brookhaven National Laboratory, Upton, New York 11973-6000
3. Department of Physics, Tohoku University, Sendai 980, Japan

We report on neutron scattering studies of the dynamic spin correlations in La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4{minus}{ital y}}. Two superconducting and one nonsuperconducting single crystals were studied. All three of the samples exhibited metallic normal-state resistivity modified by corrections consistent with localization effects. The structure factor {ital S}({bold Q},{omega}) measured in these samples reflects to a first approximation short-range two-dimensional antiferromagnetic spin correlations closely related to those found in insulating La{sub 2}CuO{sub 4}. In addition, {ital S}({bold Q},{omega}) measured in the superconducting samples has an incommensurate, double-peaked structure which is not present in the nonsuperconducting crystal. The integrated ( {integral} {ital dQ}) intensities of the scattering at both concentrations are nearly independent of temperature over the range {ital k}{sub {ital B}}T{much gt}{h bar}{omega} to {ital k}{sub {ital B}}T{much lt}{h bar}{omega} for energy transfers greater than {similar to}6 meV. Furthermore, the difference in the temperature dependence of the intensity between the nonsuperconducting and superconducting samples for energy transfers less than {similar to}6 meV suggests that a gap may be forming in the magnetic excitation spectrum of the superconducting samples. The relationship of these results to the superconductivity in La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4{minus}{ital y}} is discussed.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5650389
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:7; ISSN PRBMD; ISSN 0163-1829
• 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
ANGULAR MOMENTUM
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
DIFFRACTION
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SPIN
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
STRUCTURE FACTORS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS