Mott glass in site-diluted S=1 antiferromagnets with single-ion anisotropy

Details Mott glass in site-diluted S=1 antiferromagnets with single-ion anisotropy Mott glass in site-diluted S=1 antiferromagnets with single-ion anisotropy

2006-05-08

arxiv.org/abs/cond-mat/0605200v1

Phys. Rev. Lett. 99, 047205 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.99.047205

The interplay between site dilution and quantum fluctuations in S=1 Heisenberg antiferromagnets on the square lattice is investigated using quantum Monte Carlo simulations. Quantum fluctuations are tuned by a single-ion anisotropy D. In the clean limit, a sufficiently large D>D_c = 5.65(2) J forces each spin into its m_S=0 state, and thus destabilizes antiferromagnetic order. In the presence of site dilution, quantum fluctuations are found to destroy N\'eel order before the percolation threshold of the lattice is reached, if D exceeds a critical value D^* = 2.3(2) J. This mechanism opens up an extended quantum-disordered Mott glass phase on the percolated lattice, characterized by a gapless spectrum and vanishing uniform susceptibility.

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