Volume 62, Number 3, May 2003
|Page(s)||350 - 356|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 April 2003|
New magnetic structure study of : Evidence of incommensurate structure
Department of Physics and Institute of Basic Science SungKyunKwan University - Suwon
2 Center for Strongly Correlated Materials Research, Seoul National University Seoul 151-742, Korea
3 NRC, Chalk River Laboratoires - Chalk River, ON KOJ 1JO, Canada
4 Institute of Metal Physics, Ural Division of RAS - Ekaterinburg 620219, Russia
5 Laboratory for Neutron Scattering, ETH-Zurich and Paul Scherrer Institut - CH-5232 Villigen, Switzerland
Accepted: 26 February 2003
We have investigated the magnetic structure of using neutron diffraction from 2.2 to 30 to find new magnetic satellites below , which have never been reported before. These satellites can be indexed as , , , and , where τ is equal to 0.0194 r.l.u. (reciprocal lattice units). We have observed these new peaks in addition to magnetic peaks seen in previous measurements. We can understand this long-period incommensurate structure in terms of two propagation vectors: and . From the temperature dependence of the intensity of the commensurate and incommensurate peaks as well as our heat capacity data, we suggest that should have a modulated magnetic structure over the whole temperature range from 23 to 2, in contradiction to the long held view that is a collinear ferromagnet below .
PACS: 61.12.Ld – Single-crystal and powder 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.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
© EDP Sciences, 2003
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