Destabilization of the cooperative Jahn–Teller effect in Sm<subscript>0.2</subscript>Ca<subscript>0.8</subscript>MnO<subscript>3</subscript> by Ru-doping
In: Journal of Magnetism & Magnetic Materials, Jg. 241 (2002-03-15), Heft 2/3, S. 303-314
Online
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Zugriff:
The structural study of Sm0.2Ca0.8MnO3 and Sm0.2Ca0.8Mn0.9Ru0.1O3 versus temperature has been carried out by neutron diffraction and electron microscopy in connection with the magnetic and transport properties. A structural transition from a Pnma paramagnetic insulating structure to a P21/m C-type antiferromagnetic insulating state at TN≈150 K is observed for the undoped phase. This low temperature monoclinic structure results from a cooperative Jahn–Teller (JT) distortion of manganese cations, hindering the appearance of magnetoresistance in Sm0.2Ca0.8MnO3. In contrast, the Ru-doped phase, which exhibits two magnetic transitions at TC≈200 and TN≈110 K, keeps the Pnma structure in the whole temperature range, from 4 to 300 K, showing that Ru-doping destabilizes the JT effect. The influence of ruthenium doping upon the structure and the appearance of ferromagnetism and metallicity in Sm0.2Ca0.8MnO3 is discussed by comparing its behavior with those of the x=0.90 , 0.85, and 0.80 samples in the Sm1−xCaxMnO3 series. [Copyright &y& Elsevier]
Titel: |
Destabilization of the cooperative Jahn–Teller effect in Sm<subscript>0.2</subscript>Ca<subscript>0.8</subscript>MnO<subscript>3</subscript> by Ru-doping
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Autor/in / Beteiligte Person: | Autret, C. ; Martin, C. ; Maignan, A. ; Hervieu, M. ; Raveau, B. ; André, G. ; Bourée, F. ; Kurbakov, A. ; Trounov, V. |
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Zeitschrift: | Journal of Magnetism & Magnetic Materials, Jg. 241 (2002-03-15), Heft 2/3, S. 303-314 |
Veröffentlichung: | 2002 |
Medientyp: | academicJournal |
ISSN: | 0304-8853 (print) |
DOI: | 10.1016/S0304-8853(01)01371-3 |
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