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NQR/NMR study of Zn-doped CeCoIn$$_5$$

Zn置換CeCoIn$$_5$$における核四重極共鳴, 核磁気共鳴を用いた研究

酒井 宏典  ; 服部 泰佑; 比嘉 野乃花; 徳永 陽 ; 神戸 振作 ; Ronning, F.*; Zhu, J.-X.*; 鈴木 康平*; 大島 佳樹*; 横山 淳*

Sakai, Hironori; Hattori, Taisuke; Higa, Nonoka; Tokunaga, Yo; Kambe, Shinsaku; Ronning, F.*; Zhu, J.-X.*; Suzuki, Kohei*; Oshima, Yoshiki*; Yokoyama, Makoto*

微視的に量子臨界金属CeCoIn$$_5$$の非磁性元素置換効果を調べるために核四重極共鳴(NQR)法を用いた。CdやZnの置換で長距離反強磁性秩序が誘起される。核磁気緩和率$$1/T_1$$測定により、置換子周りの不均一な電子状態を明らかにした。講演では、Zn置換系の結果を示しながら、本系の超伝導と反強磁性秩序の共存についても議論する。

We have used Nuclear Quadrupole Resonance (NQR) to probe microscopically the response of prototypical quantum critical metal CeCoIn$$_5$$ to substitutions of small amounts of Cd or Zn for In. Such non-magnetic Cd or Zn substitutions induce a long range antiferromagnetism. In the case of Cd substitutions, approximately half of the Cd substituents induce local Ce moments in their close proximity, as observed by site-dependent longitudinal nuclear spin relaxation rates $$1/T_1$$. In the paramagnetic state, the values of $$1/T_1$$ at the main peak position are similar to those in the pure CeCoIn$$_5$$, while those are enhanced at the skirt position of spectrum. We will discuss about the heterogeneous electronic state realized in such a Zn substituted system and discuss about the coexistence of superconductivity with the antiferromagnetism, as well.

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