Surface barriers, irreversibility line, and pancake vortices in an aligned HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} superconductor
- Department of Physics, University of Tennessee, Knoxville, Tennessee 37996-1200 (United States)
- 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)
- Metals and Ceramics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831-6118 (United States)
The irreversible magnetic properties of a magnetically aligned HgBa{sub 2}Ca{sub 2}Cu{sub 3}O{sub 8+{delta}} superconductor have been investigated as a function of temperature and magnetic field, for both {bold H}{parallel}{ital c} axis and {bold H}{parallel}{ital ab} plane. Experimental results for the magnetic hysteresis {Delta}{ital M}, the field of first flux penetration {ital H}{sub {ital p}}, and the irreversibility line with {bold H}{parallel}5f aree well described by recent theory [L. Burlachkov {ital et} {ital al}., Phys. Rev. B 50, 16 770 (1994)] for thermally activated penetration of a surface barrier by pancake vortices. Near 85 K, the system crosses over from two-dimensional to three-dimensional line vortices, from which we extract estimates for the mass anisotropy parameter {epsilon}.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 102108
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 52, Issue 6; Other Information: PBD: 1 Aug 1995
- Country of Publication:
- United States
- Language:
- English
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