Physics – Condensed Matter
Scientific paper
1995-11-27
Physics
Condensed Matter
16 pages, latex, 11 figures availabe on request
Scientific paper
YBa$_2$Cu$_3$O$_7$ (YBCO) exhibits a large anisotropy between the $a$ and $b$ axes in the CuO$_2$ planes because of the presence of CuO chains. In order to account for such an anisotropy we develop a Ginzburg-Landau (GL) theory for an anisotropic d-wave superconductor in an external magnetic field, based on an anisotropic effective mass approximation within CuO$_2$ planes. The anisotropic parameter $\lambda=m_x/m_y$, where $m_x$ ($m_y$) is the effective mass in the $x$ ($y$) direction, is found to have significant physical consequences: In the bulk case, there exist both the $s$- and $d$-wave order parameters with the same transition temperature, as long as $\lambda\ne 1$. The GL equations are also solved both analytically and numerically for the vortex state, and it is shown that both the $s$- and $d$-wave components show a two-fold symmetry, in contrast to the four-fold symmetry around the vortex, as expected for the purely $d$-wave vortex. With the deviation of $\lambda$ from unity, the opposite winding between the $s$- and $d$-wave components observed in the purely $d$-wave case is gradually taken over by the same winding number. The vortex lattice is found to have oblique structure in a wide temperature range with the precise shape depending on the anisotropy.
Ren Yong
Ting Samuel C. C.
Xu Ji-Hai
No associations
LandOfFree
Superconducting state properties of a d-wave superconductor with mass anisotropy does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Superconducting state properties of a d-wave superconductor with mass anisotropy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Superconducting state properties of a d-wave superconductor with mass anisotropy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-628168