Upper critical field for anisotropic superconductivity. A tight-binding approach

Details Upper critical field for anisotropic superconductivity. A tight-binding approach Upper critical field for anisotropic superconductivity. A tight-binding approach

2000-05-08

arxiv.org/abs/cond-mat/0005142v1

Phys. Rev. B 64, 064501 (2001)

Physics

Condensed Matter

Superconductivity

6 pages, 4 PostScript figures, revtex

Scientific paper

10.1103/PhysRevB.64.064501

We study the problem of the upper critical field ($H_{c2}$) for tight-binding electrons in a two-dimensional lattice. The external magnetic field is introduced into the model Hamiltonian both via the Peierls substitution and the Zeeman term. Carrying out calculations for finite systems we analyze the influence of the external field in the commensurable and incommensurable case on an equal footing. The upper critical field has been discussed for intrasite as well as anisotropic intersite pairing that, in the absence of magnetic field, has a $d_{x^2-y^2}$ symmetry. A comparison of $H_{c2}$ determined for different symmetries shows that the on-site pairing is more affected by the external field i.e., the critical temperature for the on-site pairing decreases with the increase of the magnetic field faster than in the anisotropic case. Moreover, we have shown that the tight-binding form of the Bloch energy can lead to the upward curvature of $H_{c2}$, provided that the Fermi level is close enough to the van Hove singularity.

Affiliated with

Also associated with

No associations

Rating

Upper critical field for anisotropic superconductivity. A tight-binding approach 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 Upper critical field for anisotropic superconductivity. A tight-binding approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Upper critical field for anisotropic superconductivity. A tight-binding approach will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-425761