@article{07e39f91a15744528b863fa8b0e0ad61,
title = "Spin waves and quantum criticality in the frustrated XY pyrochlore antiferromagnet Er2Ti2O7",
abstract = "We report detailed measurements of the low temperature magnetic phase diagram of Er2Ti2O7. Heat capacity and time-of-flight neutron scattering studies of single crystals reveal unconventional low-energy states. Er3+ magnetic ions reside on a pyrochlore lattice in Er2Ti2O7, where local XY anisotropy and antiferromagnetic interactions give rise to a unique frustrated system. In zero field, the ground state exhibits coexisting short and long-range order, accompanied by soft collective spin excitations previously believed to be absent. The application of finite magnetic fields tunes the ground state continuously through a landscape of noncollinear phases, divided by a zero temperature phase transition at μ0Hc∼1.5T. The characteristic energy scale for spin fluctuations is seen to vanish at the critical point, as expected for a second order quantum phase transition driven by quantum fluctuations.",
author = "Ruff, {J. P.C.} and Clancy, {J. P.} and A. Bourque and White, {M. A.} and M. Ramazanoglu and Gardner, {J. S.} and Y. Qiu and Copley, {J. R.D.} and Johnson, {M. B.} and Dabkowska, {H. A.} and Gaulin, {B. D.}",
year = "2008",
month = oct,
day = "2",
doi = "10.1103/PhysRevLett.101.147205",
language = "English",
volume = "101",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "14",
}