Role of iso-electronic Ru5+ in thermal transport behavior of YMn1-xRuxO3 compounds

The perovskite manganites compounds with nominal composition YMn1-xRuxO3 (YMRO) (x = 0, 0.05, 0.1 and 0.2) were investigated systematically through structural, morphology and thermal transport measurements. Our thermopower and specific heat measurements indicate that the ground state of rare earth m...

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Bibliographic Details
Published in:Journal of alloys and compounds 2016-12, Vol.688, p.280-287
Main Authors: Thakur, Rajesh K., Thakur, Rasna, Kaurav, N., Ganesan, V., Okram, G.S., Gaur, N.K.
Format: Article
Language:English
Subjects:
Manganites
Specific heat
XRD
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Summary:The perovskite manganites compounds with nominal composition YMn1-xRuxO3 (YMRO) (x = 0, 0.05, 0.1 and 0.2) were investigated systematically through structural, morphology and thermal transport measurements. Our thermopower and specific heat measurements indicate that the ground state of rare earth manganite compounds is highly sensitive to the ruthenium (Ru) concentration at Mn-site and henceforth to its cationic radius. These properties were analyzed by considering various models and empirical relations. The high value and complicated temperature dependence of thermopower (S) is an indication of electron–magnon scattering in these systems. The observation of giant suppression in the S with increasing Ruthenium content confirms the mixed-valence subsistence of Mn - Ru network. Specific heat measurements depict an anomaly in the vicinity of TN and associated entropy change, was then obtained by subtracting the lattice part from the experimental data, indicating the existence of magnetic ordering and magnetic inhomogeneity in the samples. •We report structural and thermal transport properties of YMn1-xRuxO3 compounds.•Thermopower and specific heat data were analyzed by using various models.•Electron-magnon scattering is indicated by complicated T dependence of thermopower.•Giant suppression in S with Ru doping confirms presence of Mn - Ru network.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.06.279