3D {ital XY} and Lowest Landau Level Fluctuations in Deoxygenated YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} Thin Films

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.3173· OSTI ID:561619

Moloni, K; Friesen, M; Li, S; Souw, V; Metcalf, P; Hou, L; McElfresh, M ^[1]

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1. Physics Department, Purdue University, West Lafayette, Indiana 47907-1396 (United States)

Conductivity measurements reflect vortex solid melting in YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} films. Field-independent glass exponents {nu}{sub g}{approx_equal}1.9 and z{sub g}{approx_equal}4.0 describe the transition T{sub g}(H) for 0{lt}H{le}26T. At low fields, 3D XY exponents {nu}{sub XY}{approx_equal}0.63 and z{sub XY}{approx_equal}1.25 are also observed, with z{sub XY} smaller than expected. These compete with glass scaling according to multicritical theory. A predicted power-law form of T{sub g}(H) is observed for 0.5T{sub c}{lt}T{sub g}{lt}T{sub c}. For T{sub g}{lt}0.5T{sub c}, 3D XY scaling fails, but a self-consistent lowest Landau level analysis becomes possible, obtaining T{sub c2}(H) with positive curvature. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Purdue Research Foundation
• DOE Contract Number: FG02-90ER45427
• OSTI ID: 561619
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
ELECTRIC CONDUCTIVITY
LANDAU FLUCTUATIONS
MAGNETIC FLUX
PHASE DIAGRAMS
SCALING LAWS
SUPERCONDUCTING FILMS
TRANSITION TEMPERATURE
YTTRIUM OXIDES