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

TY - JOUR

T1 - Field-induced criticality in a gapped quantum magnet with bond disorder

AU - Huvonen, D.

AU - Zhao, S.

AU - Mansson, M.

AU - Laver, Mark

PY - 2012/3/30

Y1 - 2012/3/30

N2 - Neutron diffraction and calorimetric measurements are used to study the field-induced quantum phase transition in piperazinium-Cu 2(Cl 1-xBr x) 6 (x=0, 3.5%, and 7.5%), a prototypical quantum antiferromagnet with random bonds. The critical indexes φ and β 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≤d. Inelastic neutron experiments reveal that disorder has a profound effect on the lowest-energy magnetic gap excitation in the system.

AB - Neutron diffraction and calorimetric measurements are used to study the field-induced quantum phase transition in piperazinium-Cu 2(Cl 1-xBr x) 6 (x=0, 3.5%, and 7.5%), a prototypical quantum antiferromagnet with random bonds. The critical indexes φ and β 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≤d. Inelastic neutron experiments reveal that disorder has a profound effect on the lowest-energy magnetic gap excitation in the system.

U2 - 10.1103/PhysRevB.85.100410

DO - 10.1103/PhysRevB.85.100410

M3 - Journal article

SN - 2469-9950

VL - 85

SP - 100410

JO - Physical Review B

JF - Physical Review B

IS - 10

ER -