Crystal structure and antiferromagnetic spin ordering of LnFe(2/3)Mo(1/3)O(3) (Ln = Nd, Pr, Ce, La) perovskites

Stoichiometric polycrystalline samples of LnFe(2/3)Mo(1/3)O(3) (Ln = Nd, Pr, Ce, La) have been prepared by solid-state reaction and studied by means of x-ray and neutron powder diffraction as well as Mossbauer spectroscopy and magnetic measurements. All samples were found to be of single phase and to have Pnma symmetry with valence state +3 of Fe and Mo. It is demonstrated that the B-site cations of LnFe(2/3)Mo(1/3)O(3) in accord with LnFeO(3) order in a G-type antiferromagnetic structure with the magnetic moments aligned along the b axis. However, with significantly lower Neel temperatures than their LnFeO(3) parent compounds. The Fe-O-Fe bond lengths and bond angles and thus themagnitude of the antiferromagnetic superexchange interaction are found to systematically change with the ionic radius of Ln such that T-N increases with increasing radius. Only the CeFe2/3Mo1/3O3 compound experiences a low temperature spin reorientation from alignment along the b axis to the a axis.

Beran, P. (författare)
Bazuev, G. V. (författare)
Ericsson, T.Uppsala universitet,Strukturkemi (författare)
Tellgren, RolandUppsala universitet,Strukturkemi(Swepub:uu)rolandtg (författare)
Kumar, P. Anil (författare)
Nordblad, PerUppsala universitet,Fasta tillståndets fysik(Swepub:uu)pno26208 (författare)
Mathieu, RolandUppsala universitet,Fasta tillståndets fysik(Swepub:uu)rma26208 (författare)
Uppsala universitetFasta tillståndets fysik (creator_code:org_t)

Ingår i:Physical Review B. Condensed Matter and Materials Physics91:91098-01211550-235X

Av författaren/redakt...: Ivanov, Sergey A ...; Beran, P.; Bazuev, G. V.; Ericsson, T.; Tellgren, Roland; Kumar, P. Anil; visa fler...; Nordblad, Per; Mathieu, Roland; visa färre...

Om ämnet

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.