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Anisotropic spin fluctuations and anomalies of nuclear quadrupole interactions in the itinerant antiferromagnet NpCoGa$$_5$$; $$^{59}$$Co NMR and $$^{69,71}$$Ga NMR/NQR studies

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

Nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR)experiments have been performed on a single crystal of NpCoGa$$_5$$ with a N$'e$el temperature $$T_{rm N}$$=47 K. Knight shift, electric field gradient (EFG), frequency, and asymmetry parameter of the EFG are deduced for each site. These parameters are confirmed by NQR measurements in zero field. Hyperfine tensors for each site are deduced. Antiferromagnetic NMR spectra in zero field were also observed. A sharp anisotropy for spin fluctuations in NpCoGa$$_{5}$$ has also been demonstrated.



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Category:Materials Science, Multidisciplinary



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