Measurements of the nonlinear transverse magnetic moment have been carried out on disk-shaped samples of YBCO, using an ac technique. Numerical calculations for a dx2 - y2 pairing state predict a fourfold modulation of this moment as a function of the angle between the applied magnetic and the crystalline axes for a magnetic field applied in the a-b plane of the sample. Our results imply a minimum nonzero gap at all points on the Fermi surface.
|Original language||English (US)|
|Number of pages||5|
|Journal||Journal of Superconductivity and Novel Magnetism|
|State||Published - 1999|
Bibliographical noteFunding Information:
We would like to acknowledge J. Buan, B. P. Stojkovic, R. Klemm, A. J. Leggett, and D. E. Grupp for helpful discussions. This work was supported in part by the AFOSR under grant F49620-96-0043. One of us (A.B.) would like to acknowledge the Foster Wheeler Fellowship of the Graduate School, University of Minnesota, for support.
- Nonlinear Meissner effect
- Pairing state