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Magnetic excitations in the XY-pyrochlore antiferromagnet Er2Ti2O7
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Sosin, S. S., Prozorova, L. A., Lees, Martin R., Balakrishnan, G. and Petrenko, O. A.. (2010) Magnetic excitations in the XY-pyrochlore antiferromagnet Er2Ti2O7. Physical Review B (Condensed Matter and Materials Physics), Vol.82 (No.9). 094428 . ISSN 1098-0121
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Official URL: http://dx.doi.org/10.1103/PhysRevB.82.094428
Abstract
The XY-pyrochlore antiferromagnet Er2Ti2O7 is studied by heat-capacity measurements and electron-spin resonance spectroscopy performed on single-crystal samples. The magnetic phase diagrams are established for two directions of applied field, H parallel to[100] and H parallel to[111]. In the magnetically ordered phase observed below T-N = 1.2 K, the magnetic excitation spectrum consists of a Goldstone mode acquiring an isotropic gap in an applied field, and another mode with a gap softening in the vicinity of a field-induced phase transition. This second-order transition takes place at a critical field H-c above which the magnetization process is accompanied by a canting of the magnetic moments off their local "easy planes." The specific-heat curves for H parallel to[100] (H >> H-c) are well described by a model presuming a single dispersionless excitation mode with the energy gap obtained from the spectroscopic measurements.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QC Physics |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) |
| Publisher: | American Physical Society |
| ISSN: | 1098-0121 |
| Date: | 15 September 2010 |
| Volume: | Vol.82 |
| Number: | No.9 |
| Number of Pages: | 6 |
| Page Range: | 094428 |
| Identification Number: | 10.1103/PhysRevB.82.094428 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | RFBR, Engineering and Physical Sciences Research Council (EPSRC), LIA LPTMS |
| Grant number: | 10-02-01105, EP/E011802 (EPSRC) |
| URI: | http://wrap.warwick.ac.uk/id/eprint/5206 |
Data sourced from Thomson Reuters' Web of Knowledge
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