Structural transformation and magnetic competition in Yb(Mn1-xFex)O3

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© 2007 American Physical Society (APS). This is the accepted version of the following article: Huang, Yun-Hui & Karppinen, Maarit & Imamura, Naoki & Yamauchi, Hisao & Goodenough, John B. 2007. Structural transformation and magnetic competition in Yb(Mn1-xFex)O3. Physical Review B. Volume 76, Issue 17. 174405/1-5. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.76.174405, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.76.174405.
Journal Title
Journal ISSN
Volume Title
School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2007
Major/Subject
Mcode
Degree programme
Language
en
Pages
174405/1-5
Series
Physical Review B, Volume 76, Issue 17
Abstract
Structural and magnetic properties of the Yb(Mn1−xFex)O3 (0⩽x⩽1) system have been systematically investigated. Initial samples were prepared via a sol-gel method. A pure hexagonal phase was only obtained for samples with x⩽0.5. With high-pressure annealing, a pure orthorhombic perovskite phase was achieved for all the compositions. The Fe57 Mössbauer spectrum for x=0.5 shows that only Fe3+ ions exist in the system; there was no evidence of chemical inhomogeneities. With increasing x, the Néel temperature TN increases for both hexagonal and orthorhombic phases. The orthorhombic Yb(Mn0.5Fe0.5)O3 shows an interesting weak ferromagnetic state in the temperature range of 239–298K, the ferromagnetism disappearing abruptly on cooling below Tt=239K. The transition at Tt appears to be a reorientation of the spin axis of a type-G antiferromagnetic order from the orthorhombic a axis to the b axis in the (010) plane.
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Keywords
Yb(Mn1−xFex)O3, magnetic properties
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Citation
Huang, Yun-Hui & Karppinen, Maarit & Imamura, Naoki & Yamauchi, Hisao & Goodenough, John B. 2007. Structural transformation and magnetic competition in Yb(Mn1-xFex)O3. Physical Review B. Volume 76, Issue 17. 174405/1-5. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.76.174405.