RKKY ferromagnetism with Ising-like spin states in intercalated Fe(1/4)TaS2 |
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| Authors: | Ko K-T Kim Kyoo Kim Sung Baek Kim H-D Kim J-Y Min B I Park J-H Chang F-H Lin H-J Tanaka A Cheong S-W |
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| Institution: | c_CCMR & Department of Physics, Pohang University of Science and Technology, Pohang 790-784, Korea. |
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| 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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