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Oral presentation

NMR study of rotational and superconducting symmetry in URu$$_2$$Si$$_2$$

Kambe, Shinsaku

no journal, , 

In strongly correlated 5f-electrons systems, exotic electronic states appear due to the itinerant nature of 5f-electrons. Appearance of unconventional superconductivity under hidden ordered state in URu$$_{2}$$Si$$_{2}$$ is typical example of it. In this study, the rotational symmetry of hidden ordered state and the superconducting gap symmetry are investigated by means of $$^{29}$$Si NMR. As previously reported, the strength of 2-fold rotational breaking is weak and distributed in the basal plane of hidden ordered state. Consistently, the local 4-fold symmetry is supported via 4-fold Ruderman-Kittel interaction between the nearest neighbor Si sites determined by the NMR spin echo decay in the present study. The origin of muted 2-fold symmetry will be discussed. Concerning the superconducting gap symmetry, T-dependence of Knight shift along a-axis and c-axisindicates that the singlet paring (i.e. d-wave) is likely for the superconducting state of URu$$_{2}$$Si$$_{2}$$.

Oral presentation

Electronic structures of strongly correlated uranium compounds studied by three-dimensional ARPES

Fujimori, Shinichi

no journal, , 

Oral presentation

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

Sakai, 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, , 

$$beta$$-US$$_2$$ is a paramagnetic narrow-gap semiconductor with the energy band gap of 90 K. A characteristic feature of $$beta$$-US$$_2$$ 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, $$^{33}$$S-NMR study has been performed. We will show our recent $$^{33}$$S-NMR results and discuss the electronic states.

Oral presentation

Ferromagnetism in intermetallic uranium compounds URh$$_6$$X$$_4$$ (X = Si, Ge)

Haga, Yoshinori

no journal, , 

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