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Crystal and magnetic structures of the colossal magnetoresistance manganates Sr2-xNd1+xMn2O7 (x=0.0, 0.1)

Battle, P.D., Green, M.A., Laskey, N.S., Millburn, J.E., Radaelli, P.G., Rosseinsky, M.J., Sullivan, S.P., Vente, J.F. (1996) Crystal and magnetic structures of the colossal magnetoresistance manganates Sr2-xNd1+xMn2O7 (x=0.0, 0.1). Physical Review B: Condensed Matter and Materials Physics, 54 (22). pp. 15967-15977. ISSN 0163-1829. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Abstract

Neutron powder diffraction techniques have been used to refine the crystal and magnetic structures of the Ruddlesden Popper (RP) compounds Sr2-xNd1+xMn2O7 (x=0.0, 0.1), which show colossal magnetoresistance below 100 K. Samples of both compositions have been shown to be biphasic, although in each case both phases are of the RP type and have very similar structural parameters. Only one phase in each sample shows long range magnetic order. For x=0.0, the Mn cations and the Nd cations in the rocksalt layers of the structure are antiferromagnetically ordered in a noncollinear magnetic structure below 28 K; the Nd cations within the perovskite blocks do not show long range magnetic order. In the temperature range 28?T/K?137, only the Mn cations are ordered. The decoupling of the Nd cations is accompanied by a rotation of the Mn moments from a direction close (ø=27°) to the z axis into the xy plane. A similar temperature dependence is seen in the case x=0.1, although the ordered components of the cation moments are much reduced and the low temperature phase has a collinear magnetic structure with the moments aligned along z. The magnetotransport properties of these samples are discussed in the light of their crystal and magnetic structures.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Phys. Rev. B Condens. Matter Mater. Phys. [Field not mapped to EPrints] AD - Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, United Kingdom [Field not mapped to EPrints] AD - Institut Laue-Langevin, P.O. Box 156, 38042 Grenoble Cedex 9, France [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 21 Oct 2015 11:30 UTC
Last Modified: 29 May 2019 16:11 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51162 (The current URI for this page, for reference purposes)
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