Anisotropy of YBa[sub 2]Cu[sub 3[minus][ital x]]Fe[sub [ital x]]O[sub 7[minus][delta]] single crystals studied by torque magnetometry
- Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, L8S4M1 (Canada)
- Department of Physics, University of California at Davis, Davis, California 95616 (United States)
The coherence-length anisotropy ratio [gamma] of YBa[sub 2]Cu[sub 3[minus][ital x]]Fe[sub [ital x]]O[sub 7[minus][delta]] superconducting single crystals ([ital x][le]0.22) has been measured by the equilibrium-torque magnetometry method. The experiments were performed at temperatures several K below the onset [ital T][sub [ital c]] of superconductivity in magnetic fields of 1--2 T. [gamma]=9.3[plus minus]0.3 for two pure YBa[sub 2]Cu[sub 3]O[sub 7[minus][delta]] single crystals, which is 20% larger than that of previously published results. The [gamma] value of YBa[sub 2]Cu[sub 3[minus][ital x]]Fe[sub [ital x]]O[sub 7[minus][delta]] increases with increasing Fe concentration to [gamma]=29[plus minus]1.5 for [ital x]=0.22. The direct torque from the localized magnetic moments of Fe was not observed within the experimental sensitivity. The fundamental reason for the anisotropy increase is not clear.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5438385
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:2; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENCE LENGTH
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DIMENSIONS
HIGH-TC SUPERCONDUCTORS
IRON COMPOUNDS
IRON OXIDES
LENGTH
MAGNETIC PROPERTIES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES