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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, Geetha and Petrenko, Oleg (2010) Magnetic excitations in the XY-pyrochlore antiferromagnet Er2Ti2O7. Physical Review B (Condensed Matter and Materials Physics), Vol.82 (No.9). 094428 . doi:10.1103/PhysRevB.82.094428 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 | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
Publisher: | American Physical Society | ||||
ISSN: | 1098-0121 | ||||
Official Date: | 15 September 2010 | ||||
Dates: |
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Volume: | Vol.82 | ||||
Number: | No.9 | ||||
Number of Pages: | 6 | ||||
Page Range: | 094428 | ||||
DOI: | 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) |
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