Physics – Condensed Matter – Superconductivity
Scientific paper
1998-05-26
Physics
Condensed Matter
Superconductivity
submitted to the Proceedings of Stripes 98, 3 pages, 3 ps file figures, latex
Scientific paper
We argue that the $d_{x^2-y^2}$-wave superconductor is marginally stable in the presence of external perturbations. Subjected to the external perturbations by magnetic impurities, it develops a secondary component of the gap, complex $d_{xy}$, to maximize the coupling to impurities and lower the total energy. The secondary $d_{xy}$ component exists at high temperatures and produces the full gap $\sim 20 K$ in the single particle spectrum around each impurity, apart from impurity induced broadening. At low temperatures the phase ordering transition into global $ d_{x^2-y^2} + i d_{xy}$ state occurs.
Balatsky Alexander V.
Movshovich Roman
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