A Local Quantum Phase Transition in YFeAl
arXiv:1712.04033 · doi:10.1073/pnas.1721493115
Abstract
A phase transition occurs when correlated regions of a new phase grow to span the system and the fluctuations within the correlated regions become long-lived. Here we present neutron scattering measurements showing that this conventional picture must be replaced by a new paradigm in \boldmath, a compound that forms naturally very close to a \boldmath quantum phase transition. Fully quantum mechanical fluctuations of localized moments are found to diverge at low energies and temperatures, however the fluctuating moments are entirely without spatial correlations. Zero temperature order in \boldmath is achieved by a new and entirely local type of quantum phase transition that may originate with the creation of the moments themselves.
arXiv comment24 pages, 11 figure, including supplemental material
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