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NMR study of antiferromagnet UPtGa$$_{5}$$

反強磁性体UPtGa$$_{5}$$のNMRによる研究

神戸 振作; 酒井 宏典; 徳永 陽; 藤本 達也; 加藤 治一; Walstedt, R. E.; 池田 修悟; 松田 達磨; 芳賀 芳範; 大貫 惇睦

Kambe, Shinsaku; Sakai, Hironori; Tokunaga, Yo; Fujimoto, Tatsuya; Kato, Harukazu; Walstedt, R. E.; Ikeda, Shugo; Matsuda, Tatsuma; Haga, Yoshinori; Onuki, Yoshichika

最近Pu化合物で高い臨界温度を示す超伝導体が115構造を持つ化合物で発見された。PuCoGa$$_5$$($$T_{c}=18K$$)とPuRhGa$$_5$$($$T_{c}=9K$$)。この発見はアクチニド化合物研究の興味を大きくした。本研究では同型だが超伝導を示さない115化合物のNMRの研究を行い、超伝導体と比較することにより、超伝導発現機構について検討した。

Recently, new superconductors have been discovered in Pu-based HoCoGa$$_5$$(115) structure compounds: PuCoGa$$_5$$ ($$T_{c}=18K$$) and PuRhGa$$_5$$ ($$T_{c}=9K$$). The discovery has stimulated a lot of interest in actinide compounds. We report NMR measurements on a high-quality single crystal sample of the non-superconducting U- and Np-based 115 compounds. In order to elucidate universal magnetic properties and the origin of superconductivity in the 115 families, spin-lattice relaxation and Knight shift measurements have been performed systematically in the non-superconducting 115 compounds. Comparison of dynamical properties with the superconducting Pu115 compounds will be presented.

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