Enhanced anisotropic magnetoresistance in the odd-parity multipole-ordered conductor Ba1-x Kx Mn2 As2

Takuya Aoyama; Masahiro Kudo; Kaoru Igarashi; Kazutoshi Emi; Shojiro Kimura; Yoshinori Imai; Kenya Ohgushi

doi:10.1103/PhysRevB.105.224422

Enhanced anisotropic magnetoresistance in the odd-parity multipole-ordered conductor Ba1-x Kx Mn2 As2

Takuya Aoyama, Masahiro Kudo, Kaoru Igarashi, Kazutoshi Emi, Shojiro Kimura, Yoshinori Imai, Kenya Ohgushi

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We examined the magnetoresistance with applied magnetic field in the ab plane for Ba1-xKxMn2As2 with x=0-0.30, which exhibits a unique antiferromagnetic order with the simultaneous breaking of spatial-inversion and time-reversal symmetries. By investigating the temperature and magnetic-field strength/direction dependence of the magnetoresistance in detail, we found there are three main contributions to the magnetoresistance. One is due to an external field effect inducing cyclotron motion of electron and Zeeman splitting. This is most prominent at x=0 and 0.15. The second one is a spin fluctuation related negative magnetoresistance. This becomes large at a ferromagnetic transition temperature of 100 K at x=0.25. The third one is the spin-orbit coupling related effects, which leads to an in-plane anisotropy of magnetoresistance. We also argue that anisotropic magnetoresistance can be understood in terms of the magnetoelectric effect arising from the odd-parity magnetic-multipole ordering.

Original language	English
Article number	224422
Journal	Physical Review B
Volume	105
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.105.224422
Publication status	Published - 2022 Jun 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.105.224422

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title = "Enhanced anisotropic magnetoresistance in the odd-parity multipole-ordered conductor Ba1-x Kx Mn2 As2",

abstract = "We examined the magnetoresistance with applied magnetic field in the ab plane for Ba1-xKxMn2As2 with x=0-0.30, which exhibits a unique antiferromagnetic order with the simultaneous breaking of spatial-inversion and time-reversal symmetries. By investigating the temperature and magnetic-field strength/direction dependence of the magnetoresistance in detail, we found there are three main contributions to the magnetoresistance. One is due to an external field effect inducing cyclotron motion of electron and Zeeman splitting. This is most prominent at x=0 and 0.15. The second one is a spin fluctuation related negative magnetoresistance. This becomes large at a ferromagnetic transition temperature of 100 K at x=0.25. The third one is the spin-orbit coupling related effects, which leads to an in-plane anisotropy of magnetoresistance. We also argue that anisotropic magnetoresistance can be understood in terms of the magnetoelectric effect arising from the odd-parity magnetic-multipole ordering.",

author = "Takuya Aoyama and Masahiro Kudo and Kaoru Igarashi and Kazutoshi Emi and Shojiro Kimura and Yoshinori Imai and Kenya Ohgushi",

note = "Funding Information: The authors gratefully acknowledge fruitful discussions with Dr. K. Yamauchi, Dr. K. K. Huynh, Prof. H. Eisaki, and Prof. K. Tanigaki. This work was partly performed at the High field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Projects No. 15H0201, No. 16H0205, No. 18H0204, and No. 19H0203). This work is financially supported by JSPS KAKENHI No. JP19H05823, No. JP19H05822, No. JP19K21837, No. JP18H01159, No. JP16K17732, No. JP20K14396, No. JP17H05474, and No. JP19H04685. Publisher Copyright: {\textcopyright} 2022 American Physical Society.",

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doi = "10.1103/PhysRevB.105.224422",

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T1 - Enhanced anisotropic magnetoresistance in the odd-parity multipole-ordered conductor Ba1-x Kx Mn2 As2

AU - Aoyama, Takuya

AU - Kudo, Masahiro

AU - Igarashi, Kaoru

AU - Emi, Kazutoshi

AU - Kimura, Shojiro

AU - Imai, Yoshinori

AU - Ohgushi, Kenya

N1 - Funding Information: The authors gratefully acknowledge fruitful discussions with Dr. K. Yamauchi, Dr. K. K. Huynh, Prof. H. Eisaki, and Prof. K. Tanigaki. This work was partly performed at the High field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Projects No. 15H0201, No. 16H0205, No. 18H0204, and No. 19H0203). This work is financially supported by JSPS KAKENHI No. JP19H05823, No. JP19H05822, No. JP19K21837, No. JP18H01159, No. JP16K17732, No. JP20K14396, No. JP17H05474, and No. JP19H04685. Publisher Copyright: © 2022 American Physical Society.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - We examined the magnetoresistance with applied magnetic field in the ab plane for Ba1-xKxMn2As2 with x=0-0.30, which exhibits a unique antiferromagnetic order with the simultaneous breaking of spatial-inversion and time-reversal symmetries. By investigating the temperature and magnetic-field strength/direction dependence of the magnetoresistance in detail, we found there are three main contributions to the magnetoresistance. One is due to an external field effect inducing cyclotron motion of electron and Zeeman splitting. This is most prominent at x=0 and 0.15. The second one is a spin fluctuation related negative magnetoresistance. This becomes large at a ferromagnetic transition temperature of 100 K at x=0.25. The third one is the spin-orbit coupling related effects, which leads to an in-plane anisotropy of magnetoresistance. We also argue that anisotropic magnetoresistance can be understood in terms of the magnetoelectric effect arising from the odd-parity magnetic-multipole ordering.

AB - We examined the magnetoresistance with applied magnetic field in the ab plane for Ba1-xKxMn2As2 with x=0-0.30, which exhibits a unique antiferromagnetic order with the simultaneous breaking of spatial-inversion and time-reversal symmetries. By investigating the temperature and magnetic-field strength/direction dependence of the magnetoresistance in detail, we found there are three main contributions to the magnetoresistance. One is due to an external field effect inducing cyclotron motion of electron and Zeeman splitting. This is most prominent at x=0 and 0.15. The second one is a spin fluctuation related negative magnetoresistance. This becomes large at a ferromagnetic transition temperature of 100 K at x=0.25. The third one is the spin-orbit coupling related effects, which leads to an in-plane anisotropy of magnetoresistance. We also argue that anisotropic magnetoresistance can be understood in terms of the magnetoelectric effect arising from the odd-parity magnetic-multipole ordering.

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Enhanced anisotropic magnetoresistance in the odd-parity multipole-ordered conductor Ba1-x Kx Mn2 As2

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