Charge-Spin Correlation in van der Waals Antiferromagnet ${\mathrm{NiPS}}_{3}$

Charge-Spin Correlation in van der Waals Antiferromagnet ${NiPS}_{3}$

So Yeun Kim, Tae Yun Kim, Luke J. Sandilands, Soobin Sinn, Min-Cheol Lee, Jaeseok Son, Sungmin Lee, Ki-Young Choi, Wondong Kim, Byeong-Gyu Park, C. Jeon, Hyeong-Do Kim, Cheol-Hwan Park, Je-Geun Park, S. J. Moon, and T. W. Noh

Phys. Rev. Lett. 120, 136402 – Published 27 March 2018

Abstract

Strong charge-spin coupling is found in a layered transition-metal trichalcogenide ${NiPS}_{3}$ , a van der Waals antiferromagnet, from studies of the electronic structure using several experimental and theoretical tools: spectroscopic ellipsometry, x-ray absorption, photoemission spectroscopy, and density functional calculations. ${NiPS}_{3}$ displays an anomalous shift in the optical spectral weight at the magnetic ordering temperature, reflecting strong coupling between the electronic and magnetic structures. X-ray absorption, photoemission, and optical spectra support a self-doped ground state in ${NiPS}_{3}$ . Our work demonstrates that layered transition-metal trichalcogenide magnets are useful candidates for the study of correlated-electron physics in two-dimensional magnetic materials.

Received 25 June 2017
Revised 29 September 2017

DOI:https://doi.org/10.1103/PhysRevLett.120.136402

Physics Subject Headings (PhySH)

Electronic structure Magnetism

2-dimensional systems Strongly correlated systems

Density functional theory Ellipsometry First-principles calculations X-ray absorption spectroscopy X-ray photoelectron spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

So Yeun Kim^1,2, Tae Yun Kim^2,3, Luke J. Sandilands^1,2,§, Soobin Sinn^1,2, Min-Cheol Lee^1,2, Jaeseok Son^1,2, Sungmin Lee^1,2, Ki-Young Choi^1,2, Wondong Kim⁴, Byeong-Gyu Park⁵, C. Jeon⁶, Hyeong-Do Kim^1,2, Cheol-Hwan Park^2,3, Je-Geun Park^1,2,*, S. J. Moon^7,†, and T. W. Noh^1,2,‡

¹Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
²Department of Physics and Astronomy, Seoul National University (SNU), Seoul 08826, Republic of Korea
³Center for Theoretical Physics, SNU, Seoul 08826, Republic of Korea
⁴Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
⁵Pohang Accelerator Laboratory, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
⁶Advanced Nano-Surface Group, Korea Basic Science Institute (KBSI), Daejeon 34133, Republic of Korea
⁷Department of Physics, Hanyang University, Seoul 04763, Republic of Korea

^*jgpark10@snu.ac.kr
^†soonjmoon@hanyang.ac.kr
^‡twnoh@snu.ac.kr
^§Measurement Science and Standards, National Research Council Canada, Ottawa, Ottawa K1A 0R6 Canada

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Vol. 120, Iss. 13 — 30 March 2018

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Physical Review Letters

Charge-Spin Correlation in van der Waals Antiferromagnet NiPS3

So Yeun Kim, Tae Yun Kim, Luke J. Sandilands, Soobin Sinn, Min-Cheol Lee, Jaeseok Son, Sungmin Lee, Ki-Young Choi, Wondong Kim, Byeong-Gyu Park, C. Jeon, Hyeong-Do Kim, Cheol-Hwan Park, Je-Geun Park, S. J. Moon, and T. W. Noh

Phys. Rev. Lett. 120, 136402 – Published 27 March 2018

Abstract

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Charge-Spin Correlation in van der Waals Antiferromagnet ${NiPS}_{3}$