Fluctuation induced piezomagnetism in local moment altermagnets
arxiv(2024)
摘要
It was recently discovered that, depending on their symmetries, collinear
antiferromagnets may break spin degeneracy in momentum space, even in absence
of spin-orbit coupling. Such systems, dubbed altermagnets, have electronic
bands with a spin-momentum texture set mainly by the combined crystal-magnetic
symmetry. This discovery motivates the question which novel physical properties
derive from altermagnetic order. Here we show that one consequence of
altermagnetic order is a fluctuation-driven piezomagnetic response. Using the
checkerboard Heisenberg hamiltonian as a prototypical localized moment
altermagnet, we determine its fluctuation induced piezomagnetic coefficient
considering temperature induced transversal spin fluctuations. We establish in
addition that magnetic fluctuations induce an anisotropic thermal spin
conductivity.
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