title: Ising-Type Magnetic Ordering in Atomically Thin FePS3.
abstract: Magnetism in two-dimensional materials is not only of fundamental scientific interest but also a promising candidate for numerous applications. However, studies so far, especially the experimental ones, have been mostly limited to the magnetism arising from defects, vacancies, edges, or chemical dopants which are all extrinsic effects. Here, we report on the observation of intrinsic antiferromagnetic ordering in the two-dimensional limit. By monitoring the Raman peaks that arise from zone folding due to antiferromagnetic ordering at the transition temperature, we demonstrate that FePS3exhibits an Ising-type antiferromagnetic ordering down to the monolayer limit, in good agreement with the Onsager solution for two-dimensional order-disorder transition. The transition temperature remains almost independent of the thickness from bulk to the monolayer limit with TN∼ 118 K, indicating that the weak interlayer interaction has little effect on the antiferromagnetic ordering.
authors.affiliation: Department of Physics, Sogang University , Seoul 04107, Korea.
authors.forename: Jae-Ung
authors.initials: JU
authors.lastname: Lee
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS) , Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University (SNU) , Seoul 08826, Korea.
authors.forename: Sungmin
authors.initials: S
authors.lastname: Lee
authors.affiliation: Department of Physics and Astronomy, Seoul National University (SNU) , Seoul 08826, Korea.
authors.forename: Ji Hoon
authors.initials: JH
authors.lastname: Ryoo
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS) , Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University (SNU) , Seoul 08826, Korea.
authors.forename: Soonmin
authors.initials: S
authors.lastname: Kang
authors.affiliation: Department of Physics and Astronomy, Seoul National University (SNU) , Seoul 08826, Korea.
authors.forename: Tae Yun
authors.initials: TY
authors.lastname: Kim
authors.affiliation: Department of Physics and Astronomy, Seoul National University (SNU) , Seoul 08826, Korea.
authors.forename: Pilkwang
authors.initials: P
authors.lastname: Kim
authors.affiliation: Department of Physics and Astronomy, Seoul National University (SNU) , Seoul 08826, Korea.|Center for Theoretical Physics, Seoul National University (SNU) , Seoul 08826, Korea.
authors.forename: Cheol-Hwan
authors.initials: CH
authors.lastname: Park
authors.affiliation: Center for Correlated Electron Systems, Institute for Basic Science (IBS) , Seoul 08826, Korea.|Department of Physics and Astronomy, Seoul National University (SNU) , Seoul 08826, Korea.
authors.forename: Je-Geun
authors.initials: JG
authors.lastname: Park
authors.affiliation: Department of Physics, Sogang University , Seoul 04107, Korea.
authors.forename: Hyeonsik
authors.initials: H
authors.lastname: Cheong
keywords: FePS3; Ising model; Raman spectroscopy; antiferromagentism; iron phosphorus trisulfide; magnetic ordering in two dimensions