Journal article
Order by Disorder Spin Wave Gap in the XY Pyrochlore Magnet Er2Ti2O7
Abstract
The recent determination of a robust spin Hamiltonian for the antiferromagnetic XY pyrochlore Er2Ti2O7 reveals a most convincing case of the "Order-by-Quantum-Disorder" mechanism for ground state selection. This mechanism relies on quantum fluctuations to remove an accidental symmetry of the magnetic ground state, and selects a particular ordered spin structure below TN=1.2 K. The removal of the continuous degeneracy results in an energy gap in …
Authors
Ross KA; Qiu Y; Copley JRD; Dabkowska HA; Gaulin BD
Journal
Physical Review Letters, Vol. 112, No. 5,
Publisher
American Physical Society (APS)
Publication Date
February 7, 2014
DOI
10.1103/physrevlett.112.057201
ISSN
0031-9007