Response of a dx2−y2 superconductor to a Zeeman magnetic field
Kun Yang, S. L. Sondhi
DOI 10.1103/PhysRevB.57.8566 · Physical Review B
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Abstract
We study the response of a two-dimensional dx2−y2 superconductor to a magnetic field that couples only to the spins of the electrons. In contrast to the s-wave case, the dx2−y2 state is modified even at small magnetic fields, with the gap nodes widening into normal, spin polarized, pockets. We discuss the promising prospects for observing this in the cuprate superconductors in fields parallel to the Cu-O planes. We also discuss the phase diagram, inclusive of a finite momentum pairing state with a linkage between the momentum of the pairs and the nodes of the relative wave function.
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