Field-induced commensurate long-range order in the Haldane-gap system NDMAZ

Details Field-induced commensurate long-range order in the Haldane-gap system NDMAZ Field-induced commensurate long-range order in the Haldane-gap system NDMAZ

2001-04-17

arxiv.org/abs/cond-mat/0104311v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1209/epl/i2001-00362-7

High-field neutron diffraction studies of the new quantum-disordered S=1 linear-chain antiferromagnet Ni(C$_5$H$_{14}$N$_2$)$_2$N$_3$(ClO$_4$) (NDMAZ) are reported. At T=70 mK, at a critical field $H_c=13.4$ T applied along the (013) direction, a phase transition to a commensurate N\'{e}el-like ordered state is observed. The results are discussed in the context of existing theories of quantum phase transitions in Haldane-gap antiferromagnets, and in comparions with previous studies of the related system Ni(C$_5$H$_{14}$N$_2$)$_2$N$_3$(PF$_6$).

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