Ginzburg–Landau-type theory of spin superconductivity

Zhi-qiang Bao, X.C. Xie () and Qing-feng Sun ()
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Zhi-qiang Bao: Institute of Physics, Chinese Academy of Sciences
X.C. Xie: International Center for Quantum Materials, School of Physics, Peking University
Qing-feng Sun: International Center for Quantum Materials, School of Physics, Peking University

Nature Communications, 2013, vol. 4, issue 1, 1-6

Abstract: Abstract Spin superconductivity is a recently proposed analogue of conventional charge superconductivity, in which spin currents flow without dissipation but charge currents do not. Here we derive a universal framework for describing the properties of a spin superconductor along similar lines to the Ginzburg–Landau equations that describe conventional superconductors, and show that the second of these Ginzburg–Landau-type equations is equivalent to a generalized London equation. Just as the GL equations enabled researchers to explore the behaviour of charge superconductors, our Ginzburg–Landau-type equations enable us to make a number of non-trivial predictions about the potential behaviour of putative spin superconductor. They enable us to calculate the super spin current in a spin superconductor under a uniform electric field or that induced by a thin conducting wire. Moreover, they allow us to predict the emergence of new phenomena, including the spin-current Josephson effect in which a time-independent magnetic field induces a time-dependent spin current.

Date: 2013
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DOI: 10.1038/ncomms3951

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