Ferromagnetic Quantum Critical Point Induced by Tuning the Magnetic Dimensionality of the Heavy-Fermion Iron Oxypnictide Ce(Ru
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概要
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We have performed <sup>31</sup>P-NMR measurements of the c-axis-aligned poly-crystal Ce(Ru<inf>1-x</inf>Fe<inf>x</inf>)PO with a two-dimensional layered structure in order to understand the origin of T_{\text{Curie}} suppression by Fe substitution. The variation in the magnetic-fluctuation character with respect to x is investigated from the in-plane and out-of-plane fluctuations and the relationship between the static spin susceptibility and the in-plane fluctuation. It was found that three-dimensional ferromagnetic (FM) correlations are dominant and give rise to the FM ordering in CeRuPO. The out-of plane fluctuations are significantly suppressed with increasing x, and it was revealed that the FM fluctuations become two dimensional near a FM quantum critical point (QCP). Our NMR results strongly suggest that a unique FM QCP in Ce(Ru<inf>1-x</inf>Fe<inf>x</inf>)PO is induced by the suppression of the magnetic correlations along the c-axis, which is a different mechanism from that presumed in heavy-fermion compounds.
- 2013-03-15
著者
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Ishida Kenji
Department Of Chemical Science And Engineering Graduate School Of Engineering Kobe University
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Kamihara Yoichi
Department Of Applied Physics And Physico-informatics Faculty Of Science And Technology Keio Univers
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Matoba Masanori
Department Of Applied Physics And Physico-informatics Faculty Of Science And Technology Keio Univers
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Nakamura Tetsuro
Department of Applied Physics and Physico-Informatics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
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Ishida Kenji
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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Kamihara Yoichi
Departments of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan
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Kitagawa Shunsaku
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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Matoba Masanori
Departments of Applied Physics and Physico-Informatics, Keio University, Yokohama 223-8522, Japan
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Ishida Kenji
Department of Applied Chemistry, Ibaraki University
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- Ferromagnetic Quantum Critical Point Induced by Tuning the Magnetic Dimensionality of the Heavy-Fermion Iron Oxypnictide Ce(Ru₁₋xFe[x])PO