Magnetic order in RCr\mathsf{_{2}}Si\mathsf{_{2}} intermetallics |
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| Authors: | O Moze M Hofmann J M Cadogan K H J Buschow D H Ryan |
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| Institution: | (1) INFM, Unitá di Modena, Dipartimento di Fisica, Universitá di Modena e Reggio Emilia, Via G. Campi 213/a, 41100 Modena, Italy;(2) FRM-II, Technische Universität München, 85747 Garching, Germany;(3) School of Physics, University of New South Wales, NSW 2052 Sydney, Australia;(4) Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65, 1018 XE, The Netherlands;(5) The Centre for the Physics of Materials and the Physics Department, McGill University, 3600 University St., H3A 2T8 Montreal (Quebec), Canada |
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| Abstract: | The magnetic structure and ordering temperatures of three intermetallic compounds which crystallize in the tetragonal ThCr2Si2 structure, TbCr2Si2, HoCr2Si2 and ErCr2Si2, have been determined by neutron diffraction, differential scanning calorimetry and magnetization measurements. The Cr-sublattice orders anti-ferromagnetically with Néel temperatures of 758 K for TbCr2Si2, 718 K for HoCr2Si2 and 692 K for ErCr2Si2. Chromium atoms located at 4d crystallographic sites are aligned anti-parallel along the c-axis, with GZCr magnetic modes. In contrast with metallic bcc Cr, the refined room temperature value of the ordered Cr moment is anomalously large for all three compounds. No long range magnetic order of the R sublattice in TbCr2Si2 and HoCr2Si2 is observed, whilst the Er sublattice in ErCr2Si2 orders independently of the Cr sublattice below 2.4 K with moments ferromagnetically aligned in the basal plane.Received: 4 November 2003, Published online: 30 January 2004PACS:
75.25. + z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source X-ray scattering, etc.) - 75.30.Cr Saturation moments and magnetic susceptibilities - 75.50.Ee Antiferromagnetics |
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