Electronic charge transfer driven by spin cycloidal structure

Y. Ishii; S. Horio; Y. Noda; M. Hiraishi; H. Okabe; M. Miyazaki; S. Takeshita; A. Koda; K. M. Kojima; R. Kadono; H. Sagayama; H. Nakao; Y. Murakami; H. Kimura

doi:10.1103/PhysRevB.101.224436

Electronic charge transfer driven by spin cycloidal structure

Y. Ishii, S. Horio, Y. Noda, M. Hiraishi, H. Okabe, M. Miyazaki, S. Takeshita, A. Koda, K. M. Kojima, R. Kadono, H. Sagayama, H. Nakao, Y. Murakami, H. Kimura

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Abstract

Muon spin rotation and resonant soft X-ray scattering experiments on prototype multiferroics RMn2O5 (R = Y, Sm) are used to demonstrate that the local electric displacements are driven by the spin-current (SC) mechanism. Small local electric displacements were evaluated by observing spin polarization at ligand O ions, for which implanted muons served as an extremely sensitive probe. Our results for YMn2O5 provide evidence that the spin polarization of O ions forming a spin cycloid chain with Mn spins increases in proportion to the vector spin chirality (Si×Sj) of the Mn ions. This relationship strongly indicates that the charge transfer between O and Mn ions is driven by the SC mechanism, which leads to the ferroelectricity accompanying O spin polarization.

Original language	English
Article number	224436
Journal	Physical Review B
Volume	101
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.101.224436
Publication status	Published - 2020 Jun 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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@article{57847b7a35da4d148e9d7dcfad0efefd,

title = "Electronic charge transfer driven by spin cycloidal structure",

abstract = "Muon spin rotation and resonant soft X-ray scattering experiments on prototype multiferroics RMn2O5 (R = Y, Sm) are used to demonstrate that the local electric displacements are driven by the spin-current (SC) mechanism. Small local electric displacements were evaluated by observing spin polarization at ligand O ions, for which implanted muons served as an extremely sensitive probe. Our results for YMn2O5 provide evidence that the spin polarization of O ions forming a spin cycloid chain with Mn spins increases in proportion to the vector spin chirality (Si×Sj) of the Mn ions. This relationship strongly indicates that the charge transfer between O and Mn ions is driven by the SC mechanism, which leads to the ferroelectricity accompanying O spin polarization.",

author = "Y. Ishii and S. Horio and Y. Noda and M. Hiraishi and H. Okabe and M. Miyazaki and S. Takeshita and A. Koda and Kojima, {K. M.} and R. Kadono and H. Sagayama and H. Nakao and Y. Murakami and H. Kimura",

note = "Funding Information: We would like to express our thanks to the TRIUMF staff for their technical support during the experiments and to H. Lee for his assistance with the DFT calculations. This study was supported by the KAKENHI program for Scientific Research (A) (Grants No. JP15H02038 and No. JP17K05130) and (B) (Grant No. 24340064), Challenging Exploratory Research (Grant No. 2365409), Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials, and Condensed Matter Research Center, IMSS, KEK. This work was performed with the approval of the Photon Factory Program Advisory Committee (Proposals No. 2017G549, No. 2017PF-BL-19B, and No. 2019PF-22).",

year = "2020",

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doi = "10.1103/PhysRevB.101.224436",

language = "English",

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T1 - Electronic charge transfer driven by spin cycloidal structure

AU - Ishii, Y.

AU - Horio, S.

AU - Noda, Y.

AU - Hiraishi, M.

AU - Okabe, H.

AU - Miyazaki, M.

AU - Takeshita, S.

AU - Koda, A.

AU - Kojima, K. M.

AU - Kadono, R.

AU - Sagayama, H.

AU - Nakao, H.

AU - Murakami, Y.

AU - Kimura, H.

N1 - Funding Information: We would like to express our thanks to the TRIUMF staff for their technical support during the experiments and to H. Lee for his assistance with the DFT calculations. This study was supported by the KAKENHI program for Scientific Research (A) (Grants No. JP15H02038 and No. JP17K05130) and (B) (Grant No. 24340064), Challenging Exploratory Research (Grant No. 2365409), Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials, and Condensed Matter Research Center, IMSS, KEK. This work was performed with the approval of the Photon Factory Program Advisory Committee (Proposals No. 2017G549, No. 2017PF-BL-19B, and No. 2019PF-22).

PY - 2020/6/1

Y1 - 2020/6/1

N2 - Muon spin rotation and resonant soft X-ray scattering experiments on prototype multiferroics RMn2O5 (R = Y, Sm) are used to demonstrate that the local electric displacements are driven by the spin-current (SC) mechanism. Small local electric displacements were evaluated by observing spin polarization at ligand O ions, for which implanted muons served as an extremely sensitive probe. Our results for YMn2O5 provide evidence that the spin polarization of O ions forming a spin cycloid chain with Mn spins increases in proportion to the vector spin chirality (Si×Sj) of the Mn ions. This relationship strongly indicates that the charge transfer between O and Mn ions is driven by the SC mechanism, which leads to the ferroelectricity accompanying O spin polarization.

AB - Muon spin rotation and resonant soft X-ray scattering experiments on prototype multiferroics RMn2O5 (R = Y, Sm) are used to demonstrate that the local electric displacements are driven by the spin-current (SC) mechanism. Small local electric displacements were evaluated by observing spin polarization at ligand O ions, for which implanted muons served as an extremely sensitive probe. Our results for YMn2O5 provide evidence that the spin polarization of O ions forming a spin cycloid chain with Mn spins increases in proportion to the vector spin chirality (Si×Sj) of the Mn ions. This relationship strongly indicates that the charge transfer between O and Mn ions is driven by the SC mechanism, which leads to the ferroelectricity accompanying O spin polarization.

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