Magnetic measurements of the upper critical field, irreversibility line, anisotropy, and magnetic penetration depth of grain-aligned YBa sub 2 Cu sub 4 O sub 8

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.45.7402· OSTI ID:7237914

Lee, W C; Ginsberg, D M ^[1]

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1. Department of Physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801 (United States)

We have measured the upper critical field and the irreversibility line of grain-aligned YBa{sub 2}Cu{sub 4}O{sub 8}, with the magnetic field oriented perpendicular to the CuO{sub 2} planes. The upper critical field's slope, {ital dH}{sub {ital c}2}/{ital dT}, is {minus}1.57 T/K, corresponding to a zero-temperature Ginzburg-Landau (GL) coherence length of 19.5 A. The irreversibility line obeys a power-law behavior similar to that of 90-K YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}. Using the lower-critical-field data, we obtain the zero-temperature magnetic penetration depth {lambda}{sub {ital a}{ital b}}(0)=1960 A and GL parameter {kappa}{sub {ital c}}=100.

• OSTI ID: 7237914
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 45:13; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENCE LENGTH
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL FIELD
DIMENSIONS
GINZBURG-LANDAU THEORY
HIGH-TC SUPERCONDUCTORS
LENGTH
MAGNETIC FIELDS
MAGNETIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PENETRATION DEPTH
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEXTURE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES