Field-concentration phase diagram of a quantum spin liquid with bond defects

Abstract

The magnetic susceptibility of the gapped quantum spin liquid compound (C${}_4$H${}_{12}$N${}_2$)Cu${}_2$Cl${}_6$ and its chemically disordered derivatives (C${}_4$H${}_{12}$N${}_2$)Cu${}_2$(Cl${}_{1-x}$Br${}_x$)${}_6$ are systematically studied in magnetic fields of up to 45 T, as a function of Br concentration. The corresponding field-temperature and field-concentration phase diagrams are determined. Measurements on the disorder-free parent compound are not fully consistent with previously published results by other authors [PRL{\bf 96}, 257203 (2006)]. The effect of Br/Cl substitution on the magnetic properties is superficially similar to that of finite temperature. However, important differences are identified and discussed with reference to the previously studied magnetic excitation spectra.

6 pages, 6 figures. Submitted to PRB as regular paper

References in corpus (6)

• Bose-Einstein Condensation in Magnetic Insulators
• Dirty-boson physics with magnetic insulators
• Particle-hole symmetry and the dirty boson problem
• Field-driven phase transitions in a quasi-two-dimensional quantum antiferromagnet
• Quantum Phase Transitions of Hard-Core Bosons in Background Potentials
• Neutron scattering study of a quasi-2D spin-1/2 dimer system Piperazinium Hexachlorodicuprate under hydrostatic pressure

Cited by in corpus (12)

• Pressure-induced quantum critical and multicritical points in a frustrated spin liquid
• Criticality in a disordered quantum antiferromagnet by neutron diffraction
• Dynamics of a bond-disordered $S=1$ quantum magnet near $z=1$ criticality
• Spin dynamics in pressure-induced magnetically-ordered phases in PHCC
• Chemical composition induced quantum phase transition in Cs${}_{1-x}$Rb${}_x$FeCl${}_3$
• The tunable quantum spin ladder Cu(Qnx)(Cl${}_{(1-x)}$Br${}_x$)${}_2$
• Effect of disorder on a pressure-induced $z=1$ magnetic quantum phase transition
• Giant dielectric nonlinearities at a magnetic Bose-Einstein condensation
• Formation of gapless triplets in the bond-doped spin-gap antiferromagnet (C${}_4$H${}_{12}$N${}_2$)(Cu${}_2$Cl${}_6$)
• Magnetic resonance of collective paramagnets with gapped excitations spectrum
• Formation of the S=1 paramagnetic centers in the bond-diluted spin-gap magnet
• Field-induced ordering in a random-bond quantum spin ladder compound with weak anisotropy