Strong charge-spin coupling is found in a layered transition-metal trichalcogenide NiPS3, a van derWaals antiferromagnet, from our study of the electronic structure using several experimental and theoretical tools: spectroscopic ellipsometry, x-ray absorption and photoemission spectroscopy, and density-functional calculations. NiPS3 displays an anomalous shift in the optical spectral weight at the magnetic ordering temperature, reflecting a strong coupling between the electronic and magnetic structures. X-ray absorption, photoemission and optical spectra support a self-doped ground state in NiPS3. Our work demonstrates that layered transition-metal trichalcogenide magnets are a useful candidate for the study of correlated-electron physics in two-dimensional magnetic material.
@article{arxiv.1706.06259,
title = {Charge-spin correlation in van der Waals antiferromagenet NiPS3},
author = {So Yeun Kim and Tae Yun Kim and Luke J. Sandilands and Soobin Sinn and Min-Cheol Lee and Jaeseok Son and Sungmin Lee and Ki-Young Choi and Wondong Kim and Byeong-Gyu Park and C. Jeon and Hyeong-Do Kim and Cheol-Hwan Park and Je-Geun Park and S. J. Moon and T. W. Noh},
journal= {arXiv preprint arXiv:1706.06259},
year = {2018}
}