Year: 1992
Type: article
Abstract: Recent theories of the NMR in the CuO superconductors are based on a spin-singlet ${\mathit{d}}_{\mathit{x}}^{2}$-${\mathit{y}}^{2}$ order parameter. Since this state has nodal lines on the Fermi surface, nonlinear effects associated with low-energy quasiparticles become important, particularly at low temperatures. We show that the field dependence of the supercurrent, below the nucleation field for vortices, can be used to locate the positions of the nodal lines of an unconventional gap in momentum space, and hence test the proposed ${\mathit{d}}_{\mathit{x}}^{2}$-${\mathit{y}}^{2}$ state.
Source: Physical Review Letters
Authors: S. K. Yip, J. A. Sauls
Institution: Northwestern University
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2083839328