Magnetic penetration depth of (La[sub 1[minus][ital x]]Sr[sub [ital x]])[sub 2]CuO[sub 4] single crystals

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.47.2854· OSTI ID:6906160

Li, Q; Suenaga, M ^[1]; Kimura, T; Kishio, K ^[2]

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1. Division of Materials Sciences, Brookhaven National Laboratory, Upton, New York 11973 (United States)
2. Department of Industrial Chemistry, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)

We have performed magnetization measurements on a series of high-quality, large single crystals of (La[sub 1[minus][ital x]]Sr[sub [ital x]])[sub 2]CuO[sub 4] over a composition range of [ital x]=0.05--0.10, with magnetic fields parallel to the [ital c] axis. In order to avoid the large fluctuation effects near [ital T][sub [ital c]] in the analysis of the magnetization of these layered superconductors, a method of data analysis, based on the variational model developed by Hao and Clem, is used for the determination of the magnetic penetration depth [lambda][sub [ital a][ital b]]([ital T]) of this family. The conventional London approximation for the determination of [lambda]([ital T]) from mixed-state magnetization isotherms [ital M]([ital H],[ital T]) is also reevaluated, and found generally to overestimate [lambda][sub [ital a][ital b]]([ital T]) of (La[sub 1[minus][ital x]]Sr[sub [ital x]])[sub 2]CuO[sub 4] by as much as 20%. Our derived values of [lambda][sub [ital a][ital b]](0) by the Hao-Clem model shows a minimum for the crystal ([ital x]=0.077) having the highest [ital T][sub [ital c]](=35.05 K). This minimum value of [lambda][sub [ital a][ital b]](0) (=2545[plus minus]40 A) is in agreement with the earlier reported value of [lambda](0) ([similar to]2500 A) for a polycrystalline sample of (La[sub 1[minus][ital x]]Sr[sub [ital x]])[sub 2]CuO[sub 4] with [ital x]=0.075 obtained by using the muon-spin-relaxation technique.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6906160
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 47:5; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
EQUATIONS
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LONDON EQUATION
MAGNETIZATION
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS