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arXiv · 1206.4689

Mott versus Slater-type metal-insulator transition in Mn-substituted Sr3Ru2O7

M. A. Hossain·B. Bohnenbuck·Y. D. Chuang·M. W. Haverkort·I. S. Elfimov·A. Tanaka·A. G. Cruz·Z. Hu·H. -J. Lin·C. T. Chen·R. Mathieu·Y. Tokura·Y. Yoshida·L. H. Tjeng·Z. Hussain·B. Keimer·G. A. Sawatzky·A. Damascelli
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Abstract

We present a temperature-dependent x-ray absorption (XAS) and resonant elastic x-ray scattering (REXS) study of the metal-insulator transition (MIT) in Sr3(Ru1-xMnx)2O7. The XAS results reveal that the MIT drives the onset of local antiferromagnetic correlations around the Mn impurities, a precursor of the long-range antiferromagnetism detected by REXS at T_order<T_MIT. This establishes that the MIT is of the Mott-type (electronic correlations) as opposed to Slater-type (magnetic order). While this behavior is induced by Mn impurities, the (1/4,1/4,0) order exists for a wide range of Mn concentrations, and points to an inherent instability of the parent compound.

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M. A. Hossain, B. Bohnenbuck, Y. D. Chuang, M. W. Haverkort, I. S. Elfimov, A. Tanaka, A. G. Cruz, Z. Hu, H. -J. Lin, C. T. Chen, R. Mathieu, Y. Tokura, Y. Yoshida, L. H. Tjeng, Z. Hussain, B. Keimer, G. A. Sawatzky, A. Damascelli. 2012-06-20. Mott versus Slater-type metal-insulator transition in Mn-substituted Sr3Ru2O7. https://doi.org/10.1103/physrevb.86.041102

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