Quasiparticle Transport and Localization in High- Tc Superconductors
T. Senthil, Matthew P. A. Fisher, Leon Balents, Chetan Nayak
DOI 10.1103/PhysRevLett.81.4704 · Physical Review Letters
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Abstract
We present a theory of the effects of impurity scattering in dx2−y2 superconductors and their quantum disordered counterparts, based on a nonlinear-sigma-model formulation. We show the existence, in a quasi-two-dimensional system, of a novel spin-metal phase with a nonzero spin diffusion constant at zero temperature. With decreasing interlayer coupling, the system undergoes a quantum phase transition (in a new universality class) to a localized spin insulator. Experimental implications for spin and thermal transport in the high-temperature superconductors are discussed.
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