2008/11/20 by L. L. Lumata, Lumata, L. L., K. -Y. Choi +17
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.0811.3367
arxiv created 2008/11/20 · arxiv updated 2009/12/01
We report on the use of 69,71Ga nuclear magnetic resonance to probe spin dynamics in the rare-earth kagomé system Pr3Ga5SiO14. We find that the spin-lattice relaxation rate 691/T1 exhibits a maximum around 30 K, below which the Pr3+ spin correlation time τ shows novel field-dependent behavior consistent with a field-dependent gap in the excitation spectrum. The spin-spin relaxation rate 691/T2 exhibits a peak at a lower temperature (10 K) below which field-dependent power-law behavior close to T2 is observed. These results point to field-induced formation of nanoscale magnetic clusters consistent with recent neutron scattering measurements.