Half-ordered state in the anisotropic Haldane-gap antiferromagnet NDMAP

Details Half-ordered state in the anisotropic Haldane-gap antiferromagnet NDMAP Half-ordered state in the anisotropic Haldane-gap antiferromagnet NDMAP

2004-11-11

arxiv.org/abs/cond-mat/0411293v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.71.104418

Neutron diffraction experiments performed on the Haldane gap material NDMAP in high magnetic fields applied at an angle to the principal anisotropy axes reveal two consecutive field-induced phase transitions. The low-field phase is the gapped Haldane state, while at high fields the system exhibits 3-dimensional long-range Neel order. In a peculiar phase found at intermediate fields only half of all the spin chains participate in the long-range ordering, while the other half remains disordered and gapped.

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