Impurity-and field-induced magnetic orderings in doped quantum antiferromagnet TlCu1-xMgxCl3

TlCuCl3 is a spin- magnetic insulator with a spin gap . Its magnetic properties are described by a three-dimensionally coupled spin dimer model. Tl(Cu1-xMgx)Cl3 doped with nonmagnetic Mg2+ undergoes impurity-induced magnetic ordering. Because a finite gap for triplet excitations still remains, this...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2007-03, Vol.310 (2), p.1357-1359
Main Authors: FUJISAWA, M, ONO, T, FUJIWARA, H, TANAKA, H, SIKOLENKO, V, MEISSNER, M, SMEIBIDI, P, GERISCHER, S, GRAF, H. A
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Physics
Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
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Summary:TlCuCl3 is a spin- magnetic insulator with a spin gap . Its magnetic properties are described by a three-dimensionally coupled spin dimer model. Tl(Cu1-xMgx)Cl3 doped with nonmagnetic Mg2+ undergoes impurity-induced magnetic ordering. Because a finite gap for triplet excitations still remains, this doped system can also undergo magnetic-field-induced magnetic ordering. In order to investigate the phase diagram of TlCu1-xMgxCl3 with x0.01, we performed specific heat measurements and neutron scattering experiments in a magnetic field. It was found that impurity- and field-induced ordered phases are the same, and that the gapped spin liquid state observed in pure TlCuCl3 is completely wiped out by such a weak doping.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2006.10.378