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Quantum critical behavior in heavy-fermion superconductor CeIrIn$$_5$$

重い電子系CeIrIn$$_5$$の量子臨界挙動

神戸 振作; 酒井 宏典; 徳永 陽; Walstedt, R. E.*

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Walstedt, R. E.*

重い電子系超伝導体CeIrIn$$_5$$$$^{115}$$In-NMRのスピン-格子緩和時間解析を行い、反強磁性波数付近での動的帯磁率Im$$chi(vec{q},omega_n)$$のq-, $$w$$, T-依存を決定した。それから得られた温度依存:Im$$chi(vec{Q},omega_n)sim T^{-3/2}$$と反強磁性相関長$$xisim T^{-3/4}$$は3次元のスピン密度波の磁気不安定点に対する理論値と一致した。

Based on analysis of nuclear ($$^{115}$$In) spin-lattice relaxation time measurements on the heavy fermion superconductor CeIrIn$$_5$$, $$vec{q}$$, $$w$$, and temperature-dependences of the dynamical susceptibility Im$$chi(vec{q},omega_n)$$ near the antiferromagnetic wave vector $$vec{Q}$$ at low energy $$omega_n sim 10^{-4}$$ meV have been estimated. The $$T$$-dependences found, Im$$chi(vec{Q},omega_n) sim T^{-3/2}$$ and antiferromagnetic correlation length $$xisim T^{-3/4}$$, are consistent with quantum critical behavior for a three dimensional antiferromagnet ($$d$$=3, $$z$$=2) having a spin density wave instability.

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パーセンタイル:44.66

分野:Materials Science, Multidisciplinary

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