Properties that change as superconductivity disappears at high-doping concentrations in La sub 2 minus x Sr sub x CuO sub 4

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Physical Review (Section) B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.40.8872· OSTI ID:5212576

Torrance, J B; Bezinge, A; Nazzal, A I; Huang, T C; Parkin, S S.P. ^[1]; Keane, D T; LaPlaca, S J; Horn, P M; Held, G A ^[2]

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1. IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099 (USA)
2. IBM Research Division, Thomas J. Watson Research Center, Yorktown Heights, New York 10598 (USA)

In the system La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4}, as {ital x} and {ital p} (the (CuO{sub 2}){sup p{minus}2} charge) are increased, the superconducting transition temperature first increases, then peaks becoming nonsuperconducting for {ital x}{approx gt}0.26. We report here a search for changes in physical properties at the values of {ital x} where {ital T}{sub {ital c}} is observed to change its behavior. The in-plane lattice constants and the normal resistivity both show a continued monotonic decrease over this entire region, suggesting that no major electronic changes occur. The tetragonal-to-orthorhombic transition temperature {ital T}{sub {ital s}} also decreases with increasing {ital x} and becomes unobservable for {ital x}{approx gt}0.19, suggesting that this structural transition itself is unrelated to the disappearance of superconductivity that occurs at higher doping levels. The magnetic spin susceptibility {chi}{sub spin}(T) generally rises gradually with increasing doping (reflecting decreasing spin-spin interactions), reaches a maximum near {ital x}{similar to}0.25, and then decreases. There is a weak peak in {chi}{sub spin}(T) as a function of temperature at {ital T}={ital T}{sub max}. As a function of increasing {ital x},{ital T}{sub max} falls to zero near {ital x}{similar to}0.25. These two observations might be related to the disappearance of superconductivity, since all three occur near the same value of Sr content {ital x}.

• OSTI ID: 5212576
• Journal Information: Physical Review (Section) B: Condensed Matter; (USA), Journal Name: Physical Review (Section) B: Condensed Matter; (USA) Vol. 40:13; 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
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE