Easy-Axis Kagome Antiferromagnet: Local-Probe Study of Nd3Ga5SiO14

A. Zorko , F. Bert (1, 2) , P. Mendels (1) , Pierre Bordet (3) , Pascal Lejay (4)

1 LPS - Laboratoire de Physique des Solides
2 SPEC - UMR3680 - Service de physique de l'état condensé
3 NEEL - MRS - Matériaux, Rayonnements, Structure
4 NEEL - C2MA - Croissance Cristalline et MicroAnalyse

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.

Domaines: Autre [cond-mat.other]; Electrons fortement corrélés [cond-mat.str-el]

A. Zorko, F. Bert, P. Mendels, Pierre Bordet, Pascal Lejay. Easy-Axis Kagome Antiferromagnet: Local-Probe Study of Nd3Ga5SiO14. Physical Review Letters, 2008, 100 (14), pp.147201. ⟨10.1103/PhysRevLett.100.147201⟩. ⟨hal-00257756⟩