Ginzburg-Landau theory and vortex structure for a d+s-wave superconductor with orthorhombic distortion
- Department of Physics, Peking University, Beijing 100871, Peoples Republic of (China)
We study microscopically the Ginzburg-Landau (GL) theory of a d+s-wave superconductor with orthorhombic symmetry. The anisotropic pairing interaction due to the orthorhombic distortion leads to a second-order coupling between the s- and d-wave components which is proportional to the anisotropy parameter. This coupling induces a nonvanishing s-wave component even in a uniform system and a relative zero phase between the s- and d-wave components is favored. The ratio of the homogeneous bulk value of the s-wave component to that of the d-wave component decreases linearly as the temperature decreases in the vicinity of T{sub c}. The single vortex structure is studied by solving the GL equations. The asymptotic form of the order parameter for large r is proportional to e{sup if({theta})} instead of e{sup i{theta}} where f({theta}) is a function of the anisotropy parameter. Near and far away from the vortex core, both s- and d-wave components exhibit a twofold symmetry. As the temperature is sufficiently close to T{sub c}, the s-wave component exhibits almost the same behavior as the d-wave one. From the solution near the vortex core, we give a criterion for the appearance of the s-wave off-center vortices. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 544951
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 18 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
- Country of Publication:
- United States
- Language:
- English
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