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Report No.

$$^{33}$$S NMR study in $$beta$$-US$$_2$$

Sakai, Hironori   ; Tokunaga, Yo  ; Kambe, Shinsaku  ; Ramakrishna, S. K.*; Reyes, A. P.*; Rosa, P. F. S.*; Ronning, F.*; Thompson, J. D.*; Bauer, E. D.*

Uranium disulfide $$beta$$-US$$_2$$ is a paramagnetic semiconductor with a narrow band gap of 90 K at low temperatures, whereas above 80 K it is a semimetal with an extremely low density of carriers. Another characteristic feature in $$beta$$-US$$_2$$ is the strong response of the electrical resistivity to magnetic field. The magnetoresistance is similar to that of colossal magnetoresistance materials but very anisotropic. In order to clarify the microscopic spin dynamics in $$beta$$-US$$_2$$, nuclear magnetic resonance experiments have been performed. Since the natural concentration of $$^{33}$$S nuclei ($$I=frac{3}{2}$$) is only 0.76%, isotopic enrichment to 50% has been carried out. In the presentation, we would like to discuss about the microscopic magnetism in $$beta$$-US$$_2$$ to show the NMR results under high fields.



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