Superconducting properties of grain-aligned HgBa[sub 2]CuO[sub 4+[ital x]]
- Science and Technology Center for Superconductivity, Urbana, Illinois 61801 (United States) Materials Science and Engineering Department, University of Illinois, Urbana, Illinois 61801 (United States)
- Science and Technology Center for Superconductivity, Urbana, Illinois 61801 (United States)
- Science and Technology Center for Superconductivity, Urbana, Illinois 61801 (United States) Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
HgBa[sub 2]CuO[sub 4+[ital x]](Hg 1:2:0:1) particles (15 wt %) were aligned in an applied magnetic field of 70 kG at room temperature in an epoxy resin. Magnetization hysteresis loops were measured from 0 to 10 kG at 20 K for samples oriented with their [ital c] axis either parallel or perpendicular to the applied field. The degree of anisotropy, characterized by the ratio of [Delta][ital M] ([ital H][parallel][ital c] axis) to [Delta][ital M] ([ital H][perpendicular][ital c] axis), was found to be field dependent. A maximum value of 4.53 was observed at 0.5 kG; however, the anisotropy decreased dramatically with increasing field and was isotropic above 3 kG. This behavior differs significantly from grain-aligned YBa[sub 2]Cu[sub 3]O[sub 7[minus][ital x]], where the anisotropy is independent of applied field, and may indicate that flux pinning is more isotropic in Hg 1:2:0:1. The critical current density [ital J][sub [ital c]] was estimated by the Bean model to be approximately 7[times]10[sup 4] A/cm[sup 2] at 8 kG, 20 K and was independent of Hg 1:2:0:1 sample orientation.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6301074
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 48:10; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRITICAL CURRENT
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
GRAIN ORIENTATION
HIGH-TC SUPERCONDUCTORS
HYSTERESIS
MAGNETIZATION
MERCURY COMPOUNDS
MERCURY OXIDES
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0013-0065 K
TRANSITION ELEMENT COMPOUNDS