Magnetic excitations in the XY-pyrochlore antiferromagnet Er2Ti2O7
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 1098-0121Full text not available from this repository.
Official URL: http://dx.doi.org/10.1103/PhysRevB.82.094428
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 and H parallel to. 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 (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|
|Official Date:||15 September 2010|
|Number of Pages:||6|
|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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