Spin Waves and Quantum Criticality in the Frustrated XY Pyrochlore Antiferromagnet Er2Ti2O7

J. P. C. Ruff, J. P. Clancy, A. Bourque +7

We report detailed measurements of the low temperature magnetic phase diagram of Er${}_2$Ti${}_2$O${}_7$. Heat capacity and time-of-flight neutron scattering studies of single crystals,…