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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents



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ID: 192790.0, MPI für Festkörperforschung / FKF Publikationen 2004
Magnetic properties and low temperature X-ray studies of the weak ferromagnetic monoclinic and trigonal chromium tellurides Cr5Te8
Authors:Lukoschus, K.; Kraschinski, S.; Nather, C.; Bensch, W.; Kremer, R. K.
Language:English
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Journal of Solid State Chemistry
Volume:177
Issue / Number:3
Start Page:951
End Page:959
Review Status:not specified
Audience:Not Specified
Abstract / Description:Monoclinic and trigonal CrsTe(8) show a transition into the
ferromagnetic state with a Curie temperature T-c. which sensitively
depends oil the actual Composition. Monoclinic samples exhibit a lower
Tc despite their higher Cr content. This observation is explained on
the basis of less effective ferromagnetic superexchange in the
monoclinic compounds and the larger number of Cr atoms being
antiferromagnetically Coupled. Magnetization experiments performed at 5
K demonstrate that the compounds saturate already at rather low
magnetic fields. In addition, Small Values are estimated for the
coercitive field H-c as well for for the remanence magnetization both
being typical for weak ferromagnetic materials. The values for the
saturation magnetization amount to about 72% and 65% for monoclinic and
trigonal Cr5Te8, respectively. These low values can partially be
explained on the basis of antiferromagrictically Coupled Cr(III) d(3)
centers. An additional spin canting is assumed to fully account for the
reduced saturation moments. Above 300 K the susceptibilities follow a
Curie-Weiss law with large positive values for the Weiss constant and
magnetic moments in accordance with a Cr3+ 3d(3) spin configuration.
Low temperature X-ray investigations reveal unusual thermal expansion
of the a Lis well as b lattice parameters of the monoclinic and of the
a lattice parameter of the trigonal sample, respectively. Near T-c the
slope of the thermal expansions changes significantly. (C) 2003
Elsevier Inc. All rights reserved.
Free Keywords:chromium tellurides; magnetic properties; composition dependence of
Curie-temperature; thermal expansion of the structures
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:Univ Kiel, Inst Anorgan Chem, D-24098 Kiel, Germany.
; Max Planck Inst Festkorperforsch, D-70506 Stuttgart, Germany.
Identifiers:ISI:000220513000047 [ID No:1]
ISSN:0022-4596 [ID No:2]
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