Emergence of ferromagnetism and Jahn-Teller distortion in LaMn1−xCrxO3 (x<0.15) - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

Emergence of ferromagnetism and Jahn-Teller distortion in LaMn1−xCrxO3 (x<0.15)

Résumé

The emergence of a ferromagnetic component in LaMnO3 with low Cr-for-Mn substitution has been studied by x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Mn and Cr K edges. The local magnetic moment strength for the Mn and Cr are proportional to each other and follows the macroscopic magnetization. The net ferromagnetic components of Cr3+ and Mn3+ are found antiferromagnetically coupled. Unlike hole doping by La site substitution, the inclusion of Cr3+ ions up to x = 0.15 does not decrease the Jahn-Teller (JT) distortion and consequently does not signi cantly a ect the orbital ordering. This demonstrates that the emergence of the ferromagnetism is not related to JT weakening and likely arises from a complex orbital mixing.
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Dates et versions

hal-00838949 , version 1 (26-06-2013)

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Aline Y. Ramos, Hélio Tolentino, Marcio Soares, Stéphane Grenier, Oana Bunau, et al.. Emergence of ferromagnetism and Jahn-Teller distortion in LaMn1−xCrxO3 (x<0.15). Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 87 (22), pp.220404. ⟨10.1103/PhysRevB.87.220404⟩. ⟨hal-00838949⟩
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