Near-room-temperature ferrimagnetism and half-metallicity in disordered Ca1.5La0.5MnRuO6

The electron spin polarization on half-metallic double-perovskites is usually conditioned to the ordered rock-salt arrangement of the transition-metal ions along the lattice. In this work, we investigate a polycrystalline sample of the Ca1.5La0.5MnRuO6 compound by employing x-ray powder diffraction,...

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Bibliographic Details
Published in:arXiv.org 2024-10
Main Authors: Silva, A G, Pontes, R B, Boldrin, M, Pessoni, H V S, Veiga, L S I, Jesus, J R, Fabrelli, H, Gonzaga, A R C, Bittar, E M, Bufaiçal, L
Format: Article
Language:English
Subjects:
Dichroism
Electrical resistivity
Electron spin
Ferrimagnetism
First principles
High resolution electron microscopy
Magnetic measurement
Magnetoresistance
Magnetoresistivity
Metallicity
Perovskites
Polarization (spin alignment)
Room temperature
Ruthenium
Transition metals
X ray absorption
X ray powder diffraction
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Summary:The electron spin polarization on half-metallic double-perovskites is usually conditioned to the ordered rock-salt arrangement of the transition-metal ions along the lattice. In this work, we investigate a polycrystalline sample of the Ca1.5La0.5MnRuO6 compound by employing x-ray powder diffraction, high resolution transmission electron microscopy, x-ray absorption and magnetic circular dichroism at the Mn-L2,3 and Ru-M2,3 edges, magnetometry, electrical transport and first principles calculations in order to show that this is a fully disordered material exhibiting near room temperature ferrimagnetism and half-metallic conductivity, with significant intergrain tunneling magnetoresistance. These unprecedented results are compared to those of archetypical ordered double-perovskites, and discussed in terms of the Mn and Ru valences and their orbital hybridization.
ISSN:2331-8422
DOI:10.48550/arxiv.2410.01980