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Anomalous magnetic correlations in heavy fermion Pauli paramagnet UIr$$_3$$B$$_2$$; $$^{11}$$B NMR study

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

We report $$^{11}$$B NMR results of a single crystal UIr$$_3$$B$$_2$$. The measurement was performed by Fast Fourier Transformation technique, because spectral line width is extremely narrow ($$simeq$$ 10 kHz) and NMR occurs in quite limited r.f. band due to a good sample quality. From temperature variation of Knight shift and nuclear spin-lattice relaxation rate, the development of ferromagnetic correlations was clarified in the temperature range above $$T^{*} simeq 50$$ K. On the other hand, the magnetic dynamics was changed into another novel state below $$T^{*}$$; ferromagnetic correlations are restrained, meanwhile antiferromagnetic correlations are newly emerged. To explain this characteristic ground state, the one-dimensional $$5f$$ electrons state due to the unique structural lattice of UIr$$_3$$B$$_2$$ was proposed.

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Category:Physics, Condensed Matter

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