Field-induced criticality in a gapped quantum magnet with bond disorder

Details Field-induced criticality in a gapped quantum magnet with bond disorder Field-induced criticality in a gapped quantum magnet with bond disorder

2012-01-30

arxiv.org/abs/1201.6143v2

Physics

Condensed Matter

Strongly Correlated Electrons

4.2 pages, 4 figures. Submitted to PRB Rapid Communications

Scientific paper

Neutron diffraction and calorimetric measurements are used to study the field-induced quantum phase transition in piperazinium-Cu$_2$(Cl$_{1-x}$Br$_x$)$_6$ ($x=0$, x=3.5% and x=7.5%), a prototypical quantum antiferromagnet with random bonds. The critical indexes $\phi$ and $\beta$ are determined. The findings contradict some original predictions for Bose Glass based on the assumption $z=d$, but are consistent with recent theoretical results implying $z

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