Nonlinear Meissner effect in CuO superconductors
S. K. Yip, J. A. Sauls
DOI 10.1103/PhysRevLett.69.2264 · Physical Review Letters
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Abstract
Recent theories of the NMR in the CuO superconductors are based on a spin-singlet dx2-y2 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 dx2-y2 state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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