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Magnetic properties of R2Mn207 pyrochlore rare-earth solid solutions

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Imamura, N.
dc.contributor.author Karppinen, Maarit
dc.contributor.author Yamauchi, H.
dc.contributor.author Goodenough, J. B.
dc.date.accessioned 2015-10-06T09:01:57Z
dc.date.available 2015-10-06T09:01:57Z
dc.date.issued 2010
dc.identifier.citation Imamura, N. & Karppinen, Maarit & Yamauchi, H. & Goodenough, J. B. 2010. Magnetic properties of R2Mn207 pyrochlore rare-earth solid solutions. Physical Review B. Volume 82, Issue 13. 132407/1-4. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.82.132407. en
dc.identifier.issn 1550-235X (electronic)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/17947
dc.description.abstract Three (R,R′)2Mn2O7 ferromagnetic pyrochlore systems were studied to investigate the role of the R3+ ionic size versus 4f moment on the magnetic properties of the Mn2O7 sublattice. The Curie temperature TC=18±1 K for R=Y and Lu remained nearly constant for (Y1−xLux)2Mn2O7 but the magnetization data show characteristics of spin-glass behavior in low magnetic fields, and at 5 T, the magnetization fails to reach the expected 3 μB/Mn4+ found by 0.5 T in Tl2Mn2O7 and In2Mn2O7. A frustrated, minor antiferromagnetic component apparently competes with the ferromagnetic component of the Mn4+-O-Mn4+ interactions to give a minor antiferromagnetic component to the major ferromagnetic spin alignment of the Mn4+ ions. A TC=42±1 K for R=Dy and Yb remains nearly constant in the (Dy1−yYby)2Mn2O7 system and TC increases systematically from 19 to 42 K with Dy concentration in (Dy1−zLuz)2Mn2O7, which clearly shows that a ferromagnetic interaction between the R3+-ion and Mn4+-ion spins favors ferromagnetic alignment of the Mn4+-ion spins to double the magnitude of TC by relieving the frustration of the Mn2O7 sublattice. The R3+-ion size has little effect as the Mn-O-Mn bond angle changes by no more than ∼1° with changing ionic radius of the R3+ ion. en
dc.format.extent 132407/1-4
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher American Physical Society (APS) en
dc.relation.ispartofseries Physical Review B en
dc.relation.ispartofseries Volume 82, Issue 13
dc.rights © 2010 American Physical Society (APS). This is the accepted version of the following article: Imamura, N. & Karppinen, Maarit & Yamauchi, H. & Goodenough, J. B. 2010. Magnetic properties of R2Mn207 pyrochlore rare-earth solid solutions. Physical Review B. Volume 82, Issue 13. 132407/1-4. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.82.132407, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.82.132407. en
dc.subject.other Chemistry en
dc.subject.other Physics en
dc.title Magnetic properties of R2Mn207 pyrochlore rare-earth solid solutions en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.rights.holder American Physical Society (APS)
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Kemian laitos fi
dc.contributor.department Department of Chemistry en
dc.subject.keyword ferromagnetic pyrochlore systems en
dc.subject.keyword magnetic properties en
dc.identifier.urn URN:NBN:fi:aalto-201510064532
dc.type.dcmitype text en
dc.identifier.doi 10.1103/physrevb.82.132407
dc.type.version Final published version en


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