Enhanced ferromagnetism, metal-insulator transition, and large magnetoresistance in LaCaMnRu O free of e -orbital double-exchange
Journal of Applied Physics, ISSN: 1089-7550, Vol: 115, Issue: 12
2014
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Article Description
The structure, ionic valences, magnetism, and magneto-transport behaviors of mixed valence oxides LaCaMnRu O are systematically investigated. The simultaneous substitutions of La and Mn ions by Ca and Ru, respectively, are confirmed by the structural and ionic valence characterizations, excluding the presence of Mn and Ru ions. The enhanced ferromagnetism, induced metal-insulator transition, and remarkable magnetoresistance effect are demonstrated when the substitution level x is lower than ∼0.6, in spite of the absence of the Mn-Ru e-orbital double-exchange. These anomalous magnetotransport effects are discussed based on the competing multifold interactions associated with the Mn-Ru super-exchange and strong Ru-Ru hopping, while the origins for the metal-insulator transition and magnetoresistance effect remain to be clarified. © 2014 AIP Publishing LLC.
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