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