Observation of granular superconductivity in polycrystalline Sm{sub 2{minus}x}Ce{sub x}CuO{sub 4{minus}y}

Journal Article · Sat Jan 31 23:00:00 EST 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.3683· OSTI ID:573980

Blackstead, H A ^[1]; Jardim, R F ^[2]; Beeli, P; Pulling, D B; Heilman, A K ^[1]

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1. Physics Department, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
2. Instituto de Fisica, Universidade de Sao Paulo, Caixa Postal66318, 05389-970, Sao Paulo (Brazil)

Using field-dependent (0{le}B{le}7T) noncontact rf surface-resistance measurements, we confirm the onset of granular superconductivity in the high-temperature superconductor Sm{sub 2{minus}x}Ce{sub x}CuO{sub 4{minus}y}, 0.15{le}x{le}0.18 at temperatures for which there is no evidence for a bulk Meissner effect. The surface-resistance data are described with an extended form of the Coffey-Clem theory. For the samples with x=0.15, these measurements also indicate that near the mean-field critical temperature T{sub c}, {minus}dB{sub c2}{sup c}/dT{congruent}0.38T/K, for B{parallel}c axis. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 573980
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 57; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM OXIDES
COPPER OXIDES
CRITICAL TEMPERATURE
ELECTRIC CONDUCTIVITY
GRANULAR MATERIALS
HIGH-TC SUPERCONDUCTORS
MEISSNER-OCHSENFELD EFFECT
SAMARIUM OXIDES
SUPERCONDUCTIVITY