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25 April 2024

» arxiv » cond-mat/0411293

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Half-ordered state in the anisotropic Haldane-gap antiferromagnet NDMAP
A. Zheludev ; B. Grenier ; E. Ressouche ; L.-P. Regnault ; Z. Honda K. Katsumata ;
Date:	11 Nov 2004
Subject:	Strongly Correlated Electrons \| cond-mat.str-el
Abstract:	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.
Source:	arXiv, cond-mat/0411293
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