Sergei V. Pokrovsky

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We analyze in detail how the scattering by nonmagnetic impurities affects the shape and amplitude of the order parameter ~OP! and the density of states in anisotropic superconductors in the framework of BCS theory. Special attention is paid to the case when the OP is a mixture of d and s waves changing its sign on the Fermi surface. The critical temperature(More)
A quantum group analysis is applied to the Sine-Gordon model (or may be its version) in a strong-coupling regime. Infinitely many bound states are found together with the corresponding S-matrices. These new solutions of the Yang-Baxter equations are related to some reducible representations of the quantum sl(2) algebra resembling the Kac-Moody algebra(More)
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