Ginzburg-Landau theory of a d-wave superconductor with mass anisotropy -- Pairing symmetry and vortex structures
- Univ. of Houston, TX (United States). Center for Superconductivity
YBa{sub 2}Cu{sub 3}O{sub 7} (YBCO) exhibits a large anisotropy between the a (or y) and b (or x) axes in the CuO{sub 2} planes. This anisotropy can be modeled by introducing an anisotropic mass parameter {lambda} = m{sub x}/m{sub y}. Assuming a d-wave pairing interaction together with a repulsive on-site Coulomb interaction, the authors developed a Ginzburg-Landau theory for a d-wave superconductor with mass anisotropy in the presence of a magnetic field. They show that the order parameter always has s + d symmetry. The vortex structures for {lambda} = 1 and {lambda} > 1 have been numerically studied. For high {Tc} cuprates with tetragonal structure ({lambda} = 1), the vortex shows a four-fold symmetry and the vortex lattice may have oblique or triangular structure depending on the strength of the applied magnetic field, temperature, and the other parameters. For YBCO they choose {lambda} = 2, the single vortex has an elliptic shape, and the vortex lattice always shows an oblique structure. All these results are in good agreement with experimental measurements.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 413344
- Journal Information:
- International Journal of Modern Physics B, Vol. 10, Issue 22; Other Information: PBD: 10 Oct 1996
- Country of Publication:
- United States
- Language:
- English
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