The disordered-free-moment phase: a low-field disordered state in spin-gap antiferromagnets with site dilution
arXiv:cond-mat/0611615 · doi:10.1088/1367-2630/10/1/013034
Abstract
Site dilution of spin-gapped antiferromagnets leads to localized free moments, which can order antiferromagnetically in two and higher dimensions. Here we show how a weak magnetic field drives this order-by-disorder state into a novel disordered-free-moment phase, characterized by the formation of local singlets between neighboring moments and by localized moments aligned antiparallel to the field. This disordered phase is characterized by the absence of a gap, as it is the case in a Bose glass. The associated field-driven quantum phase transition is consistent with the universality of a superfluid-to-Bose-glass transition. The robustness of the disordered-free-moment phase and its prominent features, in particular a series of pseudo-plateaus in the magnetization curve, makes it accessible and relevant to experiments.
4 pages, 4 figures
References in corpus (13)
- Quantum Monte Carlo with Directed Loops
- Order-Disorder Transition in a Two-Layer Quantum Antiferromagnet
- Ground-State Phase Diagram of Quantum Heisenberg Antiferromagnets on the Anisotropic Dimerized Square Lattice
- Classical percolation transition in the diluted two-dimensional S=1/2 Heisenberg antiferromagnet
- Temperature-dependent spin gap and singlet ground state in BaCuSi2O6
- Low-Temperature Properties of the Randomly Depleted Heisenberg Ladder
- Holes in a Quantum Spin Liquid
- Site-Dilution-Induced Antiferromagnetic Long-Range Order in Two-Dimensional Spin-Gapped Heisenberg Antiferromagnet
- Order by disorder from non-magnetic impurities in a two-dimensional quantum spin liquid
- Field-induced disorder in a gapped spin system with non-magnetic impurities
- Field-induced quantum disordered phases in S=1/2 weakly-coupled dimer systems with site dilution
- High Field behavior of the Spin Gap compound SrCu(BO)
- Magnetic ordering in a doped frustrated spin-Peierls system
Cited by in corpus (5)
- Quantum critical scaling at a Bose-glass/superfluid transition: theory and experiment on a model quantum magnet
- Emergent interacting spin islands in a depleted strong-leg Heisenberg ladder
- Magnetic Bose glass phases of coupled antiferromagnetic dimers with site dilution
- Bond Disorder in Even-Leg Heisenberg Ladders
- Quantum transitions from superfluid to insulating phases in disordered Bose systems