Quantum Phase Transition of a Magnet in a Spin Bath

Details Quantum Phase Transition of a Magnet in a Spin Bath Quantum Phase Transition of a Magnet in a Spin Bath

2005-05-03

arxiv.org/abs/cond-mat/0505064v1

Science 308, 389 (2005)

Physics

Condensed Matter

Other Condensed Matter

13 pages, 3 figures, pre-proof version

Scientific paper

10.1126/science.1108317

The excitation spectrum of a model magnetic system, LiHoF$_4$, has been studied using neutron spectroscopy as the system is tuned to its quantum critical point by an applied magnetic field. The electronic mode softening expected for a quantum phase transition is forestalled by hyperfine coupling to the nuclear spins. We show that interactions with the nuclear spin bath control the length scale over which the excitations can be entangled. This generic result limits how far it is possible to approach intrinsic electronic quantum criticality.

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