Stability of nodal quasi-particles in superconductors with coexisting orders

Details Stability of nodal quasi-particles in superconductors with coexisting orders Stability of nodal quasi-particles in superconductors with coexisting orders

2007-09-30

arxiv.org/abs/0710.0113v2

Phys. Rev. Lett. 100, 027003 (2008)

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, a few references and Journal-ref added

Scientific paper

10.1103/PhysRevLett.100.027003

We establish a condition for the perturbative stability of zero energy nodal points in the quasi-particle spectrum of superconductors in the presence of coexisting \textit{commensurate} orders. The nodes are found to be stable if the Hamiltonian is invariant under time reversal followed by a lattice translation. The principle is demonstrated with a few examples. Some experimental implications of various types of assumed order are discussed in the context of the cuprate superconductors.

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