Equilibrium superconducting properties of grain-aligned HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}}
- Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
- Faculty of Natural Resources, University of Talca, Talca (Chile)
- Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6061 (United States)
- Chemical and Analytical Sciences Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6100 (United States)
The upper critical field {ital H}{sub {ital c}2} and other equilibrium properties of a magnetically aligned HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} superconductor have been investigated. Experimental results for the reversible magnetization, both with {bold H}{parallel}{ital c} and {bold H}{parallel}{ital ab}, are analyzed using the theoretical formalism of Hao {ital et} {ital al}. [Phys. Rev. B 43, 2844 (1991)] for type-II superconductors. Near {ital T}{sub {ital c}}, the slopes {ital dH}{sub {ital c}2}/{ital dT} of the upper critical field are {minus}1.6 T/K and {minus}12.1 T/K for fields parallel and perpendicular to the {ital c} axis, respectively. These correspond to coherence lengths (extrapolated to {ital T}=0) of {xi}{sub {ital a}{ital b}}(0)=15 A and {xi}{sub {ital c}}=1.9 A. This gives a lower bound on the superconductive anisotropy parameter {gamma}=({ital m}{sub {ital c}}/{ital m}{sub {ital a}{ital b}}){sup 1/2}{ge}8.
- Research Organization:
- Oak Ridge Y-12 Plant
- DOE Contract Number:
- AC05-84OS21400
- OSTI ID:
- 46343
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 17 Vol. 51; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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