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Journal Articles

NMR shift measurements of $$^{69}$$Ga in unconventional superconductor PuRhGa$$_{5}$$

Sakai, Hironori; Tokunaga, Yo; Fujimoto, Tatsuya; Kambe, Shinsaku; Walstedt, R. E.; Yasuoka, Hiroshi; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Nakamura, Akio; et al.

Journal of the Physical Society of Japan, 75(Suppl.), p.50 - 52, 2006/08

Very recently, we have succeeded in NMR/NQR measurements for PuRhGa$$_{5}$$. PuRhGa$$_{5}$$ is a superconductor with $$T_{c}$$$$approx$$9 K, which is isomorphic to PuCoGa$$_{5}$$ with the higher $$T_{c}$$=18 K. We have reported that PuRhGa$$_{5}$$ is an unconventional superconductor with an anisotropic gap, through the measurement of NQR spin-lattice relaxation rate $$1/T_{1}$$ , while PuCoGa$$_{5}$$ is also reported to be such an anisotropic superconductor. The Knight shift $$K$$ and $$1/T_{1}$$ of NMR under applied field for the normal state of PuRhGa$$_{5}$$ suggest an anisotropic feature of hyperfine and/or spin fluctuation in this system. We will outline the superconducting state and report the nature of the normal state based on the basis of $$K$$ and $$1/T_{1} T$$ results. The difference between PuRhGa$$_{5}$$ and PuCoGa$$_{5}$$ will be also discussed.

Journal Articles

Decrease in $$^{111}$$Cd knight shift in superconducting Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$; Evidence for spin-singlet pairing

Sakai, Hironori; Tokunaga, Yo; Kambe, Shinsaku; Kitagawa, Kentaro*; Murakawa, Hiroshi*; Ishida, Kenji*; Ono, Hiroyuki*; Kato, Masaki*; Yoshimura, Kazuyoshi*; Walstedt, R. E.

Journal of the Physical Society of Japan, 73(11), p.2940 - 2943, 2004/11

https://doi.org/10.1143/JPSJ.73.2940
 Times Cited Count：8 Percentile：47.33(Physics, Multidisciplinary)

$$^{111}$$Cd NMR measurements have been performed in the superconducting (SC) state of the pyrochlore Cd$$_{2}$$Re$$_{2}$$O$$_{7}$$ at T$$_{c}$$ $$sim$$ 1 K, and in a field of less than 3 kOe below $$T_{c}$$. The upper critical field at 0.1 K has been determined to be 4 kOe from in situ measurements of the ac susceptibility. A reduction of the Knight shift in the SC state is confirmed. The present results provide strong evidence that this compound has a singlet SC pairing symmetry.

Journal Articles

Ga and Pt NMR study of UPtGa$$_{5}$$ and UNiGa$$_{5}$$

Kato, Harukazu; Sakai, Hironori; Tokunaga, Yo; Tokiwa, Yoshifumi; Ikeda, Shugo; Onuki, Yoshichika; Kambe, Shinsaku; Walstedt, R. E.

Journal of the Physical Society of Japan, 72(9), p.2357 - 2363, 2003/09

https://doi.org/10.1143/JPSJ.72.2357
 Times Cited Count：17 Percentile：66.16(Physics, Multidisciplinary)

Ga and Pt NMR measurements have been carried out for two isomorphs compounds, UPtGa$$_{5}$$ and UNiGa$$_{5}$$, which indicate different magnetic structures below T$$_{N}$$. Knight shift K measurements in the paramagnetic region are reported here. Transferred hyperfine coupling constants at Ga and Pt sites are determined. The temperature independent part K$$_{0}$$ of K, which probes the conduction electron polarization at the ligand site, has successfully evaluated. An nearly identical conduction electron structure in the paramagnetic region is suggested for the both compounds. The origin of the different magnetic structure is discussed.

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