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Emergent odd-parity multipoles and magnetoelectric effects on a diamond structure : Implication for the 5d transition metal oxides AOsO(4) (A = K, Rb, and Cs)
| Title: | Emergent odd-parity multipoles and magnetoelectric effects on a diamond structure : Implication for the 5d transition metal oxides AOsO(4) (A = K, Rb, and Cs) |
| Authors: | Hayami, Satoru Browse this author | | Kusunose, Hiroaki Browse this author | | Motome, Yukitoshi Browse this author |
| Issue Date: | 17-Jan-2018 |
| Publisher: | American Physical Society (APS) |
| Journal Title: | Physical Review B |
| Volume: | 97 |
| Issue: | 2 |
| Start Page: | 24414 |
| Publisher DOI: | 10.1103/PhysRevB.97.024414 |
| Abstract: | We report our theoretical predictions on the linear magnetoelectric (ME) effects originating from odd-parity multipoles associated with spontaneous spin and orbital ordering on a diamond structure. We derive a two-orbital model for d electrons in e(g) orbitals by including the effective spin-orbit coupling which arises from the mixing between e(g) and t(2g) orbitals. We show that the model acquires a net antisymmetric spin-orbit coupling once staggered spin and orbital orders occur spontaneously. The staggered orders are accompanied by odd-parity multipoles: magnetic monopole, quadrupoles, and toroidal dipoles. We classify the types of the odd-parity multipoles according to the symmetry of the spin and orbital orders. Furthermore, by computing the ME tensor using the linear response theory, we show that the staggered orders induce a variety of the linear ME responses. We elaborate all possible ME responses for each staggered order, which are useful to identify the order parameter and to detect the odd-parity multipoles by measuring the ME effects. We also elucidate the effect of lowering symmetry by a tetragonal distortion, which leads to richer ME responses. The implications of our results are discussed for the 5d transition metal oxides, AOsO(4) (A = K, Rb, and Cs), in which the order parameters are not fully identified. |
| Rights: | ©2018 American Physical Society |
| Type: | article |
| URI: | http://hdl.handle.net/2115/68381 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 速水 賢
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