Quantum Phase Transition of a Magnet in a Spin Bath

+ See all authors and affiliations

Science  15 Apr 2005:
Vol. 308, Issue 5720, pp. 389-392
DOI: 10.1126/science.1108317

You are currently viewing the abstract.

View Full Text


The excitation spectrum of a model magnetic system, LiHoF4, was studied with the use of neutron spectroscopy as the system was tuned to its quantum critical point by an applied magnetic field. The electronic mode softening expected for a quantum phase transition was forestalled by hyperfine coupling to the nuclear spins. We found that interactions with the nuclear spin bath controlled the length scale over which the excitations could be entangled. This generic result places a limit on our ability to observe intrinsic electronic quantum criticality.

View Full Text