Microscopic theory of vortex pinning: Impurity terms in the Ginzburg-Landau free energy
- Department of Physics, Purdue University, West Lafayette, Indiana 47907-1396 (United States)
In the presence of a single impurity, the Ginzburg-Landau free-energy functional for a superconductor acquires extra terms. Using microscopic theory, we determine the structure of these terms and their coefficients. Our calculation is very general: we assume a {bold {ital {cflx k}}}-dependent order parameter {Delta}({bold {ital {cflx k}}}), which transforms according to any one-dimensional irreducible representation of the crystalline point group. This representation may be conventional or unconventional, as appropriate to the current models of high-{ital T}{sub {ital c}} superconductors. We treat an arbitrary Fermi surface. The physical significance of the theory is discussed, with emphasis on vortex pinning. We estimate the pinning energy of a single vortex. {copyright} {ital 1996 The American Physical Society.}
- Research Organization:
- Purdue Univ., West Lafayette, IN (United States)
- DOE Contract Number:
- FG02-90ER45427
- OSTI ID:
- 286059
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 18; Other Information: PBD: May 1996
- Country of Publication:
- United States
- Language:
- English
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