Easy-Axis Kagome Antiferromagnet: Local-Probe Study of Nd3Ga5SiO14
Résumé
We report a local-probe investigation of the magnetically anisotropic kagomé compound Nd$_3$Ga$_5$SiO$_{14}$. Our zero-field $\mu$SR results provide a direct evidence of a fluctuating collective paramagnetic state down to 60 mK, supported by a wipe-out of the NMR signal below 25 K. This state is realized despite a broad distribution of local environments, detected by $^{69,71}$Ga NMR. At 60 mK a dynamics crossover to a much more static state is observed by $\mu$SR in magnetic fields above 0.5 T. Accordingly, the NMR signal is recovered at low $T$ above a threshold field, revealing a rapid temperature and field variation of the magnetic fluctuations.