Europhys. Lett., 63 (3) , pp. 374-380 (2003)
Evidence for the coexistence of low-dimensional magnetism and long-range order inM. Loewenhaupt1, W. Schäfer2, A. Niazi3 and E. V. Sampathkumaran3
1 Institut für Festkörperphysik, Technische Universität Dresden 01062 Dresden, Germany
2 Mineralogisch-Petrologisches Institut, Universität Bonn - 53115 Bonn, Germany
3 Tata Institute of Fundamental Research - Homi Bhabha Road, Mumbai-400 005, India
(Received 5 February 2003; accepted in final form 5 June 2003)
We report the results of neutron powder diffraction studies on the spin-chain compound in the temperature range from 3 to 293 . Bragg peaks due to magnetic ordering start appearing below about 100 . The most interesting observation is that there is a diffuse magnetic peak superimposed over the strongest magnetic Bragg peak. The diffuse magnetic intensity is observed below as well as above 100 . This finding provides a new insight into the physics of this compound as though the low-dimensional magnetic interaction coexists with long-range magnetic order -a novel situation among quasi-one-dimensional oxides.
61.12.Ld - Neutron diffraction.
75.25.+z - Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.).
75.40.-s - Critical-point effects, specific heats, short-range order.
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