Spin-Peierls Transition in Ce Compounds
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概要
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A possible spin-Peierls (dimerization) transition in Ce Compounds is investigated theoretically, in connection with the novel phase transition recently reported to occur in CeRu2Al10. It is pointed out that one-dimensional zigzag chains are profiled by connecting nearest-neighbor (n.-n.) Ce ions in this compound. If only the RKKY interactions between n.-n. Ce3+ ions are considered in the mean-field approximation, a spin-Peierls transition occurs at $T=27$ K for the zero-temperature gap parameter $\Delta_{0}=90$ K, regardless of the magnetic anisotropy. The characteristics of CeRu2Al10 can be accounted for semiquantitatively, including the finite value of susceptibility for $T\to 0$ K due to a Van-Vleck contribution of the excited states of the crystalline electric field at $\approx 10^{2}$ K above the ground-state doublet.
- Physical Society of Japanの論文
- 2010-04-15
著者
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Hanzawa Katsurou
Department Of Physics Faculty Of Science And Technology Science University Of Tokyo
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