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Anisotropic spin fluctuations and superconductivity in "115" heavy fermion compounds; $$^{59}$$Co NMR study in PuCoGa$$_5$$

"115"型重い電子系化合物における異方的スピン揺らぎと超伝導; PuCoGa$$_5$$における$$^{59}$$Co NMR研究

Baek, S.-H.*; 酒井 宏典; Bauer, E. D.*; Mitchell, J. N.*; Kennison, J. A.*; Ronning, F.*; Thompson, J. D.*

Baek, S.-H.*; Sakai, Hironori; Bauer, E. D.*; Mitchell, J. N.*; Kennison, J. A.*; Ronning, F.*; Thompson, J. D.*

超伝導体PuCoGa$$_5$$の通常状態において、$$^{59}$$Co NMR測定を単結晶を用いて行った。核スピン-格子緩和率とナイトシフトの温度依存性から、反強磁性的スピン相関が発達していることを明らかにした。同じ結晶構造を持つ重い電子系超伝導体との比較を行い、${it XY}$的なスピン揺らぎ異方性が重い電子系超伝導体にとって重要な役割を担うことを示した。

We report results of $$^{59}$$Co nuclear magnetic resonance measurements on a single crystal of superconducting PuCoGa$$_5$$ in its normal state. The nuclear spin-lattice relaxation rates and the Knight shifts as a function of temperature reveal an anisotropy of spin fluctuations with finite wave vector ${it q}$. By comparison with the isostructural members, we conclude that antiferromagnetic ${it XY}$-type anisotropy of spin fluctuations plays an important role in mediating superconductivity in these heavy fermion materials.

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パーセンタイル:36.26

分野:Physics, Multidisciplinary

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