Fluctuation-induced piezomagnetism in local moment altermagnets

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Kostiantyn V. Yershov - , Leibniz Institute for Solid State and Materials Research Dresden, NASU - Bogolyubov Institute for Theoretical Physics (Author)
  • Volodymyr P. Kravchuk - , Leibniz Institute for Solid State and Materials Research Dresden, NASU - Bogolyubov Institute for Theoretical Physics (Author)
  • Maria Daghofer - , University of Stuttgart (Author)
  • Jeroen Van Den Brink - , Clusters of Excellence ct.qmat: Complexity and Topology in Quantum Matter, Chair of Solid State Theory, Leibniz Institute for Solid State and Materials Research Dresden (Author)

Abstract

It was recently discovered that, depending on their symmetries, collinear antiferromagnets may break spin degeneracy in momentum space, even in the 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 of which novel physical properties derive from altermagnetic order. Here we show that one consequence of altermagnetic order is a fluctuation-driven piezomagnetic response. Using two Heisenberg models of d-wave altermagnets, a checkerboard one and one for rutiles, we determine the fluctuation-induced piezomagnetic coefficients considering temperature-induced transversal spin fluctuations. We establish in addition that magnetic fluctuations induce an anisotropic thermal spin conductivity.

Details

Original languageEnglish
Article number144421
JournalPhysical Review B
Volume110
Issue number14
Publication statusPublished - 1 Oct 2024
Peer-reviewedYes