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

A.Y. RAMOS; H. TOLENTINO; M.M. SOARES; S. GRENIER; O. BUNAU; F. BAUDELET; F. WILHELM; A. ROJALEV; R. SOUZA; M. SOUZA NETO; O. PROUX; D. TESTEMALE; A. CANEIRO

PHYSICAL REVIEW B

AMER PHYSICAL SOC

Lugar: New York; Año: 2013 vol. 87 p. 2204041 - 2204045

1098-0121

The emergence of a ferromagnetic component in LaMnO3 with low Cr-for-Mn substitution has been studiedby x-ray absorption spectroscopy and x-ray magnetic circular dichroism at the Mn and Cr K edges. Thelocal magnetic moment strengths for Mn and Cr are proportional to each other and follow the macroscopicmagnetization. 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 theJahn-Teller (JT) distortion and consequently does not significantly affect the orbital ordering. This demonstratesthat the emergence of the ferromagnetism is not related to JT weakening and likely arises from a complex orbitalmixing.