Nonlinear σ model for odd-frequency triplet superconductivity in superconductor/ferromagnet structures
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2004
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Bunder, J.
Efetov, K.
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Physical Review B: Condensed Matter and Materials Physics, 2004; 70(13):1-7
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J. E. Bunder and K. B. Efetov
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Abstract
We consider some properties of odd-frequency triplet superconducting condensates. In order to describe fluctuations we construct a supermatrix σ model for the superconductor/ferromagnet or superconductor/normal-metal structures. We show that an odd frequency triplet superconductor, when in isolation or coupled to a normal metal, generally displays behavior comparable to a superconductor with the usual singlet pairings. However, for spin dependent systems such as the superconductor/ferromagnet the two types of superconductor have quite different behavior. We discuss this difference by considering transformations under which the σ model is invariant. Finally, we calculate the low energy density of states in a ferromagnet coupled to a singlet superconductor. If odd frequency triplet components are induced in the ferromagnet the density of states will decrease relative to the usual bulk solution but will not vanish.
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© 2004 The American Physical Society