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Published on: March 24, 2019
RKKY ferromagnetism with Ising-like spin states in intercalated Fe(1/4)TaS2
K-T Ko1, Kyoo Kim, Sung Baek Kim
1c_CCMR & Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea.
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.
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