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20 April 2024

» arxiv » 1305.6486

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Emergence of ferromagnetism and Jahn-Teller distortion in low Cr-substituted LaMnO3
A.Y. Ramos ; H.C.N. Tolentino ; O. Bunau ; Y. Joly ; S. Grenier ; R.A. Souza ; N.M. Souza-Neto ; F. Baudelet ; F. Wilhelm ; A. Rogalev ; O. Proux ; A. Caneiro ;
Date:	28 May 2013
Abstract:	The emergence of a ferromagnetic component in $LaMnO_{3}$ 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 $Cr^{3+}$ and $Mn^{3+}$ are found antiferromagnetically coupled. Unlike hole doping by La site substitution, the inclusion of $Cr^{3+}$ ions up to x = 0.15 does not decrease the Jahn-Teller (JT) distortion and consequently does not significantly affect 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.
Source:	arXiv, 1305.6486
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