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Crystal and magnetic structures of (La0.70Ca0.30)(CryMn1-y)O-3: A neutron powder diffraction study

Francesconi, M. G.; Francesconi, G; Capogna, L.; Martinelli, A.; Francesconi, M. Grazia; Radaelli, P. G.; Carvajal, J. Rodriguez; Cabeza, O.; Ferretti, M.; Castellano, C.; Corridoni, T.; Pompeo, N.

Authors

M. G. Francesconi

G Francesconi

L. Capogna

A. Martinelli

P. G. Radaelli

J. Rodriguez Carvajal

O. Cabeza

M. Ferretti

C. Castellano

T. Corridoni

N. Pompeo



Abstract

The crystal and magnetic structures of (La0.70Ca0.30)(CryMn1−y)O3 for y=0.70, 0.50, and 0.15 have been investigated using neutron powder diffraction. The three samples crystallize in the Pnma space group at both 290 and 5K and exhibit different magnetic structures at low temperature. In (La0.70Ca0.30)(Cr0.70Mn0.30)O3, antiferromagnetic order with a propagation vector k=0 sets in. The magnetic structure is Gx, i.e., of G type with spins parallel to the a axis. On the basis of our Rietveld refinement and the available magnetization data, we speculate that only Cr3+ spins order, whereas Mn4+ act as random magnetic impurities. In (La0.70Ca0.30)(Cr0.50Mn0.50)O3 the spin order is still of the type Gx, although the net magnetic moment is smaller. No evidence for magnetic order of the Mn ions is observed. Finally, in (La0.70Ca0.30)(Cr0.15Mn0.85)O3 a ferromagnetic ordering of the Mn spins takes place, whereas the Cr3+ ions act as random magnetic impurities with randomly oriented spins. © 2008 The American Physical Society

Citation

Capogna, L., Martinelli, A., Francesconi, M. G., Radaelli, P. G., Carvajal, J. R., Cabeza, O., …Pompeo, N. (2008). Crystal and magnetic structures of (La0.70Ca0.30)(CryMn1-y)O-3: A neutron powder diffraction study. Physical review B: Condensed matter and materials physics, 77(10), 0 - 0. doi:10.1103/PhysRevB.77.104438

Journal Article Type Article
Online Publication Date Mar 27, 2008
Publication Date Mar 1, 2008
Journal Physical Review B - Condensed Matter and Materials Physics
Print ISSN 1098-0121
Electronic ISSN 1550-235X
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 77
Issue 10
Article Number ARTN 104438
Pages 0 - 0
DOI https://doi.org/10.1103/PhysRevB.77.104438
Keywords Electronic, Optical and Magnetic Materials; Condensed Matter Physics
Public URL https://hull-repository.worktribe.com/output/409555
Publisher URL https://journals.aps.org/prb/abstract/10.1103/PhysRevB.77.104438