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Proc. of 5th Int. Symposium on ASR-WYP-2005 – Advances in the Physics and Chemistry of Actinide Compounds –
NMR Shift Measurements of 69Ga in Unconventional Superconductor PuRhGa5
Hironori Sakai1,
Yo Tokunaga1,
Tatsuya Fujimoto1,
Shinsaku Kambe1,
Russell E. Walstedt1,
Hiroshi Yasuoka1,
Dai Aoki2,
Yoshiya Homma2,
Etsuji Yamamoto1,
Akio Nakamura1,
Yoshinobu Shiokawa1,2,
Kunihisa Nakajima3,
Yasuo Arai3,
Tatsuma D. Matsuda1,
Yoshinori Haga1 and
Yoshichika Ōnuki1,4
1Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195
2Institute for Materials Research, Tohoku University, Oarai, Ibaraki 311-1313
3Department of Nuclear Energy System, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195
4Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043
The NMR shift (K) at the Ga(2) site (the 4i site) has been measured in PuRhGa5, a compound which shows anisotropic superconductivity below Tc ≈9 K. In the normal state, K(T) is very nearly independent of T below ∼30 K. This result is consistent with the relaxation rate measurements. This Korringa-like behavior indicates the formation of Fermi-liquid state below ∼30 K. The transferred hyperfine coupling constants have been estimated from the relation between K and the bulk susceptibility, showing a strong anisotropy. Measurements of K(T) in the superconducting state have also been performed. A decrease of K in the superconducting state has been observed, which strongly suggests a spin-singlet pairing.
URL:
http://jpsj.ipap.jp/link?JPSJS/75S/50/
DOI: 10.1143/JPSJS.75S.50
KEYWORDS:superconductivity, PuRhGa5, NMR shift, spin-singlet pairing
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