New magnetic structure study of : Evidence of incommensurate structure

Seongsu Lee; A. N. Pirogov; J.-G. Park; I. P. Swainson; Yu. A. Dorofeev; A. E. Teplykh; A. S. Ermolenko; E. G. Gerasimov; A. A. Podlesnyak

doi:10.1209/epl/i2003-00403-3

All issues

Volume 62 / No 3 (May 2003)

Europhys. Lett., 62 3 (2003) 350-356

Abstract

Issue		Europhys. Lett. Volume 62, Number 3, May 2003


Page(s)		350 - 356
Section		Condensed matter: structure, mechanical and thermal properties
DOI		https://doi.org/10.1209/epl/i2003-00403-3
Published online		01 April 2003

Europhys. Lett., 62 (3), pp. 350-356 (2003)

New magnetic structure study of $\chem{TbNi_{5}}$ : Evidence of incommensurate structure

Seongsu Lee¹, A. N. Pirogov¹, J.-G. Park¹^,2, I. P. Swainson³, Yu. A. Dorofeev⁴, A. E. Teplykh⁴, A. S. Ermolenko⁴, E. G. Gerasimov⁴ and A. A. Podlesnyak⁵

¹ Department of Physics and Institute of Basic Science SungKyunKwan University - Suwon 440-746, Korea
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

Received: 21 May 2002
Accepted: 26 February 2003

Abstract

We have investigated the magnetic structure of $\chem{TbNi_{5}}$ using neutron diffraction from 2.2 to 30 $\un{K}$ to find new magnetic satellites below $T_{\ab{C}} = 23$ $\un{K}$ , which have never been reported before. These satellites can be indexed as $(0, 0, 1 \pm \tau)$ , $(1, 0, 1 \pm \tau)$ , $(0, 0, 2 \pm \tau)$ , and $(1, 0, 2 \pm \tau)$ , 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: $\bm{k}_1 = (0, 0, 0)$ and $\bm{k}_2 = (0, 0, \tau)$ . From the temperature dependence of the intensity of the commensurate and incommensurate peaks as well as our heat capacity data, we suggest that $\chem{TbNi_5}$ should have a modulated magnetic structure over the whole temperature range from 23 to 2 $\un{K}$ , in contradiction to the long held view that $\chem{TbNi_5}$ is a collinear ferromagnet below $T_{\ab{C}} = 23$ $\un{K}$ .

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.)

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