Print Email Facebook Twitter Role of Oxygen Electrons in the Metal-Insulator Transition in the Magnetoresistive Oxide La2-2xSr1+2xMn2O7 Probed by Compton Scattering Title Role of Oxygen Electrons in the Metal-Insulator Transition in the Magnetoresistive Oxide La2-2xSr1+2xMn2O7 Probed by Compton Scattering Author Barbiellini, B. Koizumi, A. Mijnarends, P.E. Al-Sawai, W. Lin, H. Nagao, T. Hirota, K. Itou, M. Sakurai, Y. Bansil, A. Faculty Applied Sciences Department Radiation, Radionuclides and Reactors Date 2009-05-20 Abstract We have studied the [100]-[110] anisotropy of the Compton profile in the bilayer manganite. Quantitative agreement is found between theory and experiment with respect to the anisotropy in the two metallic phases (i.e., the low temperature ferromagnetic and the colossal magnetoresistant phase under a magnetic field of 7 T). Robust signatures of the metal-insulator transition are identified in the momentum density for the paramagnetic phase above the Curie temperature. We interpret our results as providing direct evidence for the transition from the metalliclike to the admixed ionic-covalent bonding accompanying the magnetic transition. The number of electrons involved in this phase transition is estimated. Our study demonstrates the sensitivity of the Compton scattering technique for identifying the number and type of electrons involved in the metal-insulator transition. To reference this document use: http://resolver.tudelft.nl/uuid:e8e5b97f-9565-4da0-b90b-c67ce139f12d DOI https://doi.org/10.1103/PhysRevLett.102.206402 Publisher American Physical Society ISSN 1079-7114 Source Physical Review Letters, 102 (20), 2009 Part of collection Institutional Repository Document type journal article Rights (c) 2009 The Authors ; American Physical Society Files PDF Mijnarends2_2009.pdf 355.42 KB Close viewer /islandora/object/uuid:e8e5b97f-9565-4da0-b90b-c67ce139f12d/datastream/OBJ/view