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Field induced phase diagram of the XY pyrochlore antiferromagnet Er$_2$Ti$_2$O$_7$ | E. Lhotel
; J. Robert
; E. Ressouche
; F. Damay
; I. Mirebeau
; J. Ollivier
; H. Mutka
; P. Dalmas de Réotier
; A. Yaouanc
; C. Marin
; C. Decorse
; S. Petit
; | Date: |
25 Jan 2017 | Abstract: | We explore the field-temperature phase diagram of the XY pyrochlore
antiferromagnet Er$_2$Ti$_2$O$_7$, by means of magnetization and neutron
diffraction experiments. Depending on the field strength and direction relative
to the high symmetry cubic directions $[001], [1ar{1}0]$ and $[111]$, the
refined field induced magnetic structures are derived from the zero field
$psi_2$ and $psi_3$ states of the $Gamma_5$ irreducible representation which
describes the ground state of XY pyrochlore antiferromagnets. At low field,
domain selection effects are systematically at play. In addition, for $[001]$,
a phase transition is reported towards a $psi_3$ structure at a critical field
$H_c^{001}=$ 43 mT. For $[1ar{1}0]$ and $[111]$, the spins are continuously
tilted by the field from the $psi_2$ state, and no phase transition is found
while domain selection gives rise to sharp anomalies in the field dependence of
the Bragg peaks intensity. For $[1ar{1}0]$, these results are confirmed by
high resolution inelastic neutron scattering experiments, which in addition
allow to determine the field dependence of the spin gap. This study agrees
qualitatively with the scenario proposed theoretically by Maryasin et al.
[Phys. Rev. B 93, 100406(R) (2016)], yet the strength of the field induced
anisotropies is significantly different from theory. | Source: | arXiv, 1701.7220 | Services: | Forum | Review | PDF | Favorites |
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