Springer LINK: The European Physical Journal B - Abstract Volume 4 Issue 2 (1998) pp 159-167

The European Physical Journal B

ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)

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Abstract Volume 4 Issue 2 (1998) pp 159-167

Charge states of transition metal in "Cr, Co and Ni" doped Ln$\sf_{0.5}$Ca$\sf_{0.5}$MnO$\sf _3$ CMR manganites

O. Toulemonde, F. Studer (a), A. Barnabé, A. Maignan, C. Martin, B. Raveau

Laboratoire CRISMAT (UMR 6508), associée au CNRS, ISMRA, boulevard Maréchal Juin, 14050 Caen Cedex, France

Received: 9 January 1998 / Received in final form: 6 April 1998 / Accepted: 7 April 1998

Abstract: The XAS study at Cr, Co, Ni and Mn K-edges was performed for the doped CMR manganites Ln_0.5Ca_0.5Mn_1-xB_xO₃ with Ln=La, Nd, Sm and B= Cr, Co, Ni ($0\leq x \leq 0.10$), on the samples that were studied previously for their ferromagnetic-metallic to antiferromagnetic-insulator transition. We observed that the formal charges of the doping elements are Ni²⁺, Co²⁺ and Cr³⁺. It is also evidenced that the average formal charge of the manganese is increased after doping, in agreement with the charge compensation keeping "O₃" stoichiometry. These results suggest that the doping elements participate directly to the band structure.

PACS. 78.70.Dm X-ray absorption spectra - 75.70.Pa Giant magnetoresistances - 71.30.+h Metal-insulator transitions and other electronic transitions

(a) email: studer@crindy.ismra.fr

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