Quasiclassical theory for antiferromagnetic metals
arXiv:2208.07888 · doi:10.1103/PhysRevB.107.174503
Abstract
Unlike ferromagnetism, antiferromagnetism cannot readily be included in the quasiclassical Keldysh theory because of the rapid spatial variation in the directions of the magnetic moments. The quasiclassical framework is useful because it separates the quantum effects occurring at length scales comparable to the Fermi wavelength from other length scales, and has successfully been used to study a wide range of phenomena involving both superconductivity and ferromagnetism. Starting from a tight-binding Hamiltonian, we develop general quasiclassical equations of motion and boundary conditions, which can be used to describe two-sublattice metallic antiferromagnets in the dirty limit. The boundary conditions are applicable also for spin-active boundaries that can be either compensated or uncompensated. Additionally, we show how nonuniform or dynamic magnetic textures influence the equations and we derive a general expression for observables within this framework.
24 pages, 4 figures
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- Quantum transport theory for unconventional magnets: Interplay of altermagnetism and p-wave magnetism with superconductivity
- Interface probe for antiferromagnets using geometric curvature
- Neel proximity effect in superconductor/antiferromagnet heterostructures
- Triplet correlations in superconductor/antiferromagnet heterostructures: dependence on type of antiferromagnetic ordering
- Interplay between Superconductivity and Altermagnetism in Disordered Materials and Heterostructures