title: RKKY ferromagnetism with Ising-like spin states in intercalated Fe(1/4)TaS2.
abstract: We investigated the magnetic nature of Fe(1/4)TaS2 using x-ray absorption spectroscopy, photoemission spectroscopy, and first principles band calculations. The results show a large unquenched orbital magnetic moment (∼1.0  μ(B)/Fe) at intercalated Fe sites, resulting in a gigantic magnetic anisotropy (H(A)≃60  T). The magnetic coupling is well understood in terms of the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, suggesting a novel RKKY ferromagnet with Ising-type spin states. We also found that this indirect exchange coupling between the neighboring Fe spins is ferromagnetic and maximized at the Fe-Fe distance of 2×2 superstructure.
authors.affiliation: c_CCMR & Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
authors.forename: K-T
authors.initials: KT
authors.lastname: Ko
authors.forename: Kyoo
authors.initials: K
authors.lastname: Kim
authors.forename: Sung Baek
authors.initials: SB
authors.lastname: Kim
authors.forename: H-D
authors.initials: HD
authors.lastname: Kim
authors.forename: J-Y
authors.initials: JY
authors.lastname: Kim
authors.forename: B I
authors.initials: BI
authors.lastname: Min
authors.forename: J-H
authors.initials: JH
authors.lastname: Park
authors.forename: F-H
authors.initials: FH
authors.lastname: Chang
authors.forename: H-J
authors.initials: HJ
authors.lastname: Lin
authors.forename: A
authors.initials: A
authors.lastname: Tanaka
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong