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S nuclear magnetic resonance spectra of uranium disulfide 
-US
Sakai, Hironori; Tokunaga, Yo; Haga, Yoshinori; Kambe, Shinsaku; Ramakrishna, S. K.*; Reyes, A. P.*; Rosa, P. F. S.*; Ronning, F.*; Thompson, J. D.*; Fisk, Z.*; et al.
JPS Conference Proceedings (Internet), 30, p.011169_1 - 011169_6, 2020/03
Uranium disulfide -US showing a semimetal-to-semiconductor crossover has been investigated by the nuclear magnetic resonance (NMR) technique for S nuclei with the nuclear spin of 
. Since the natural concentration 0.76% of NMR active S nuclei is too dilute, the isotopic enrichment to 
50% has been carried out for the single crystal growth. The S NMR spectra have been successfully obtained using a single crystal of -US with external fields along the crystallographic 
axis. The S sites assignments have been made based on these NMR spectra.
S-NMR study in -USSakai, Hironori; Hattori, Taisuke; Higa, Nonoka; Tokunaga, Yo; Tateiwa, Naoyuki; Yamamoto, Etsuji; Haga, Yoshinori; Kambe, Shinsaku; Reyes, A. P.*; Bauer, E. D.*; et al.
no journal, ,
-US is a paramagnetic narrow-gap semiconductor with the energy band gap of 90 K. A characteristic feature of -US is the strong response of the electrical resistivity to magnetic field. On the other hand, ferromagnetism is easily induced by pressure of about 1 GPa. Consequently, it is considered to be close to a ferromagnetic instability. To elucidate microscopically this very sensitive electronic states to external fields, S-NMR study has been performed. We will show our recent S-NMR results and discuss the electronic states.
S NMR study in -USSakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Ramakrishna, S. K.*; Reyes, A. P.*; Rosa, P. F. S.*; Ronning, F.*; Thompson, J. D.*; Bauer, E. D.*
no journal, ,
Uranium disulfide -US 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 -US 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 -US, nuclear magnetic resonance experiments have been performed. Since the natural concentration of S nuclei (
) 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 -US to show the NMR results under high fields.
