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Field-induced phase diagram of the XY pyrochlore antiferromagnetEr2Ti2O7
- Source :
- Physical Review B. 95
- Publication Year :
- 2017
- Publisher :
- American Physical Society (APS), 2017.
-
Abstract
- We explore the field-temperature phase diagram of the XY pyrochlore antiferromagnet ${\mathrm{Er}}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ by means of magnetization and neutron diffraction experiments. Depending on the field strength and direction relative to the high symmetry cubic directions $[001],[1\overline{1}0]$, and $[111]$, the refined field-induced magnetic structures are derived from the zero field ${\ensuremath{\psi}}_{2}$ and ${\ensuremath{\psi}}_{3}$ states of the ${\mathrm{\ensuremath{\Gamma}}}_{5}$ 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 ${\ensuremath{\psi}}_{3}$ structure at a characteristic field ${H}_{c}^{001}=43$ mT. For $[1\overline{1}0]$ and $[111]$, the spins are continuously tilted by the field from the ${\ensuremath{\psi}}_{2}$ 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 $[1\overline{1}0]$, these results are confirmed by high resolution inelastic neutron scattering experiments, which in addition allow us 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.
- Subjects :
- Physics
Condensed matter physics
Neutron diffraction
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Inelastic neutron scattering
Magnetization
Irreducible representation
0103 physical sciences
Antiferromagnetism
010306 general physics
0210 nano-technology
Ground state
Intensity (heat transfer)
Phase diagram
Subjects
Details
- ISSN :
- 24699969 and 24699950
- Volume :
- 95
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........48f2346d8cd3e5c905a8977110e11a1d