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cond-mat.mtrl-sci2025★ 6 cited
Thermodynamic formulation of the spin magnetic octupole moment in bulk crystals
Jun Ōiké, Robert Peters, Koki Shinada
The discovery of unconventional antiferromagnets, such as altermagnets, has drawn significant attention to higher-rank magnetic multipoles, particularly magnetic octupoles. Despite…
cond-mat.mtrl-sci2024★ 18 cited
Nonlinear Magnetoelectric Effect under Magnetic Octupole Order: Its Application to a -Wave Altermagnet and a Pyrochlore Lattice with All-In/All-Out Magnetic Order
Jun Ōiké, Koki Shinada, Robert Peters
Extensive investigation has recently been conducted into a new class of antiferromagnetic order known as magnetic octupole order. However, the high rank of octupoles makes it diffi…
cond-mat.mtrl-sci2024
Orbital optical activity in noncentrosymmetric metals and superconductors
Koki Shinada, Robert Peters
We present the optical activity induced by the orbital magnetic moment in metals and superconductors using Green's function formalization. We show that an apparent singularity of t…