Long-Range Order in the Dipolar XY Antiferromagnet Er2Sn2O7 - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles Physical Review Letters Year : 2017

Long-Range Order in the Dipolar XY Antiferromagnet Er2Sn2O7


Er$_2$Sn$_2$O$_7$ remains a puzzling case among the extensively studied frustrated compounds of the rare-earth pyrochlore family. Indeed, while a first-order transition towards a long-range antiferromagnetic state with the so-called Palmer-Chalker structure is theoretically predicted, it has not yet been observed, leaving the issue as to whether it is a spin-liquid candidate open. We report on neutron scattering and magnetization measurements which evidence a second-order transition towards this Palmer-Chalker ordered state around 108 mK. Extreme care was taken to ensure a proper thermalization of the sample, which has proved to be crucial to successfully observe the magnetic Bragg peaks. At the transition, a gap opens in the excitations, superimposed on a strong quasielastic signal. The exchange parameters, refined from a spin-wave analysis in applied magnetic field, confirm that Er$_2$Sn$_2$O$_7$ is a realization of the dipolar $XY$ pyrochlore antiferromagnet. The proximity of competing phases and the strong $XY$ anisotropy of the Er$^{3+}$ magnetic moment might be at the origin of enhanced fluctuations, leading to the unexpected nature of the transition, the low ordering temperature, and the observed multiscale dynamics.
Fichier principal
Vignette du fichier
1705.04462.pdf (1.34 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-01633911 , version 1 (13-11-2017)



S. Petit, Elsa Lhotel, F. Damay, P. Boutrouille, A. Forget, et al.. Long-Range Order in the Dipolar XY Antiferromagnet Er2Sn2O7. Physical Review Letters, 2017, 119 (18), pp.187202. ⟨10.1103/PhysRevLett.119.187202⟩. ⟨cea-01633911⟩
162 View
169 Download



Gmail Facebook X LinkedIn More