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

Autor: Hüvonen, D., Zhao, S., Månsson, M., Yankova, T., Ressouche, E., Niedermayer, C., Laver, M., Gvasaliya, S. N., Zheludev, A.
Rok vydání: 2012
Předmět:
Zdroj: Phys. Rev. B 85, 100410(R) (2012)
Druh dokumentu: Working Paper
DOI: 10.1103/PhysRevB.85.100410
Popis: 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 $zComment: 4.2 pages, 4 figures. Submitted to PRB Rapid Communications
Databáze: arXiv