Dynamical Behavior of Spins in the Rare-Earth Kagom\'{e} Pr$_3$Ga$_5$SiO$_{14}$

TL;DR

This study uses nuclear magnetic resonance to investigate spin dynamics in a rare-earth kagomé system, revealing field-dependent relaxation behaviors and the formation of nanoscale magnetic clusters.

Contribution

It provides new insights into the field-dependent spin relaxation and cluster formation in Pr$_3$Ga$_5$SiO$_{14}$, a rare-earth kagomé system.

Findings

Maximum in $^{69}1/T_1$ at 30 K indicating spin relaxation peak.

Peak in $^{69}1/T_{2}$ at 10 K with power-law behavior.

Evidence of field-induced nanoscale magnetic clusters.

Abstract

We report on the use of $^{69,71}$Ga nuclear magnetic resonance to probe spin dynamics in the rare-earth kagom\'{e} system Pr$_3$Ga$_5$SiO$_{14}$. We find that the spin-lattice relaxation rate $^{69}1/T_1$ exhibits a maximum around 30 K, below which the Pr$^{3+}$ spin correlation time $\tau$ shows novel field-dependent behavior consistent with a field-dependent gap in the excitation spectrum. The spin-spin relaxation rate $^{69}1/T_{2}$ exhibits a peak at a lower temperature (10 K) below which field-dependent power-law behavior close to $T^{2}$ is observed. These results point to field-induced formation of nanoscale magnetic clusters consistent with recent neutron scattering measurements.