Magnetic penetration depth in superconducting La{sub 2{minus}x}Sr{sub x}CuO{sub 4} films

Journal Article · Fri Jan 01 04:00:00 EST 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.59.641· OSTI ID:300155

Paget, K M ^[1]; Guha, S; Cieplak, M Z; Trofimov, I E ^[2]; Turneaure, S J; Lemberger, T R ^[1]

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1. Department of Physics, Ohio State University, Columbus, Ohio, 43210-1106 (United States)
2. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey, 08855 (United States)

We have measured the magnetic penetration depth {lambda}(T) in a series of superconducting La{sub 2{minus}x}Sr{sub x}CuO{sub 4} films with Sr concentrations from x=0.135 to 0.175. {lambda}{sup {minus}2}(T){minus}{lambda}{sup {minus}2}(0) is quadratic in {ital T} for 0.4{lt}T{lt}10 K, which puts an upper limit of about 4 K on a possible isotropic gap. The larger magnitude of {lambda}(0), reduced T{sub C}, and higher resistivity of films relative to bulk samples, plus the T{sup 2} behavior of {lambda}{sup {minus}2}(T){minus}{lambda}{sup {minus}2}(0), lead naturally to the conclusion that superconductivity in La{sub 2{minus}x}Sr{sub x}CuO{sub 4} is {ital d} wave. Near T{sub C} the real part of the conductivity and {lambda}(T) are analyzed for critical behavior. The data indicate that the critical region is no wider than 1 K. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 300155
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 59; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
PENETRATION DEPTH
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING FILMS
TEMPERATURE RANGE 0000-0013 K
THIN FILMS