TY - JOUR
T1 - Anomalous Hall effect in κ -type organic antiferromagnets
AU - Naka, Makoto
AU - Hayami, Satoru
AU - Kusunose, Hiroaki
AU - Yanagi, Yuki
AU - Motome, Yukitoshi
AU - Seo, Hitoshi
N1 - Funding Information:
M.N. and H.S. would like to thank H. Fukuyama, T. Furukawa, S. Iguchi, K. Riedl, T. Sasaki, H. Taniguchi, and S. M. Winter for valuable comments and discussions. This work is supported by Grant-in-Aid for Scientific Research, No. JP16K17731, No. JP19K03723, No. JP18H04296 (J-Physics), No. JP18K13488, No. JP15H05885(J-Physics), No. JP19K03752, No. JP20K05299, No. JP19K21860, No. JP19H05825, JST-CREST(No. JPMJCR18T2), and the GIMRT Program of the Institute for Materials Research, Tohoku University, No. 19K0019.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/8/15
Y1 - 2020/8/15
N2 - We theoretically propose a mechanism for the anomalous Hall effect (AHE) in an antiferromagnetic (AFM) state of κ-type organic conductors. We incorporate the spin-orbit coupling in the effective Hubbard model on the κ-type lattice structure, taking into account the orientation of the molecules and their arrangement with dimerization. Treating this model by means of the Hartree-Fock approximation and the linear response theory, we find that an intrinsic contribution to the Hall conductivity becomes nonzero in the electron-doped AFM metallic phase with a small canted ferromagnetic moment. We show that, contrary to the conventional wisdom, the spin canting is irrelevant to the Hall response; the nonzero Hall conductivity originates from the collinear component of the AFM order in the presence of the spin-orbit coupling. These features are well explained analytically in the limit of strong dimerization on the anisotropic triangular lattice. Furthermore, we present an intuitive picture for the present AHE by considering the real-space configuration of emergent magnetic fluxes. We also find that the Hall response appears even in the undoped AFM insulating phase at nonzero frequency as the magneto-optical Kerr effect, which is enhanced around the charge-transfer excitations. We discuss possible detections of the AHE in ET based compounds.
AB - We theoretically propose a mechanism for the anomalous Hall effect (AHE) in an antiferromagnetic (AFM) state of κ-type organic conductors. We incorporate the spin-orbit coupling in the effective Hubbard model on the κ-type lattice structure, taking into account the orientation of the molecules and their arrangement with dimerization. Treating this model by means of the Hartree-Fock approximation and the linear response theory, we find that an intrinsic contribution to the Hall conductivity becomes nonzero in the electron-doped AFM metallic phase with a small canted ferromagnetic moment. We show that, contrary to the conventional wisdom, the spin canting is irrelevant to the Hall response; the nonzero Hall conductivity originates from the collinear component of the AFM order in the presence of the spin-orbit coupling. These features are well explained analytically in the limit of strong dimerization on the anisotropic triangular lattice. Furthermore, we present an intuitive picture for the present AHE by considering the real-space configuration of emergent magnetic fluxes. We also find that the Hall response appears even in the undoped AFM insulating phase at nonzero frequency as the magneto-optical Kerr effect, which is enhanced around the charge-transfer excitations. We discuss possible detections of the AHE in ET based compounds.
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U2 - 10.1103/PhysRevB.102.075112
DO - 10.1103/PhysRevB.102.075112
M3 - Article
AN - SCOPUS:85090115173
VL - 102
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 7
M1 - 075112
ER -