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Journal Articles

$$^9$$Be-NMR studies of the heavy-fermion superconductor UBe$$_{13}$$

To, Hideki*; Tsugawa, Norihiko*; Sera, Masafumi*; Haga, Yoshinori; Onuki, Yoshichika

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.706 - 708, 2007/03

Field-angle dependence of $$^9$$Be-NMR measurements has been carried out for a single crystal UBe$$_{13}$$ in the temperature range of 0.35-1.5 K. For the [001] direction, we observed that $$^9$$Be-NMR spectra consisted of 10 lines; one line comes from a Be(I) site located in the cubic symmetry, while nine lines come from Be(II) sites located in the lower symmetry. From the field angle dependence of the NMR spectra, we determined NQR parameters. In the superconducting state, we found that $$^9$$Be-NMR Knight shift for [001] direction does not change at all. This result is consistent with the spin triplet pairing state in UBe$$_{13}$$.

Journal Articles

Hyperfine interactions in the heavy-fermion superconductor UBe$$_{13}$$; $$^9$$Be NMR studies

To, Hideki*; Tsugawa, Norihiko*; Sera, Masafumi*; Harima, Hisatomo*; Haga, Yoshinori; Onuki, Yoshichika

Journal of the Physical Society of Japan, 76(2), p.024705_1 - 024705_9, 2007/02

https://doi.org/10.1143/JPSJ.76.024705
 Times Cited Count：15 Percentile：62.92(Physics, Multidisciplinary)

$$^9$$Be NMR measurements have been performed for a single crystal UBe$$_{13}$$ with $$T_{rm c}$$ = 0.86 K. For an applied field parallel to [001] direction, we have observed a well-split $$^9$$Be NMR line with the sharp line- width of 10 Oe, guaranteeing the high-quality of the single crystal from the microscopic viewpoint. We have also calculated the electric field gradient ($$^9$$ EFG) tensor at Be(II) site using the band-structure calculation based on an FLAPW-LDA method. The present results give direct evidence that the Be 2p orbital is responsible for conduction bands.

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