Quantized Hyperfine Field at an Implanted ${\mu }^{+}$ Site in PrPb${}_3$: Interplay between Localized $f$ Electrons and an Interstitial Charged Particle

Abstract

The local effect of an interstitial hydrogen-like particle on localized $f$ electrons was studied in PrPb${}_3$ by means of ${\mu }^{+}$ spin rotation and relaxation. Spontaneous ${\mu }^{+}$ spin precession with harmonic frequencies was observed for the first time in $f$ electron compounds. We demonstrate that the signal is derived from a coupling between the ${\mu }^{+}$ spin and the hyperfine-enhanced nuclear spin of nearest neighbor (nn) ${}^{141}$Pr with Ising-like anisotropy. The signal also suggests a marked suppression of spin dynamics of the nn ${}^{141}$Pr in comparison with that of the bulk ${}^{141}$Pr. These facts strongly indicate modification of the $f$ electronic state due to the interstitial charged particle.

5 pages, 4 figures. Archival upload of the author-prepared manuscript and figures as accepted for publication in 2009. Affiliations shown are those at the time of publication

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