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Title: Detection of structural and magnetic transitions in la 0.67Ba0.23Ca0.1MnO3 using the rf resonance technique
Authors: Naik, V.B.
Lam, M.C.
Mahendiran, R. 
Keywords: Dynamical magnetization
Rf absorption
Structural transition
Issue Date: Sep-2010
Citation: Naik, V.B., Lam, M.C., Mahendiran, R. (2010-09). Detection of structural and magnetic transitions in la 0.67Ba0.23Ca0.1MnO3 using the rf resonance technique. Journal of Magnetism and Magnetic Materials 322 (18) : 2754-2757. ScholarBank@NUS Repository.
Abstract: We report radio-frequency (rf) electrodynamics in polycrystalline La 0.67Ba0.23Ca0.1MnO3 as a function of temperature and magnetic field using a home-built LC resonant circuit powered by an integrated chip oscillator. The resonance frequency (fr) of the oscillator and the power (P) absorbed by the sample are measured simultaneously. The paramagnetic to ferromagnetic phase transition in the absence of an external magnetic field is accompanied by a rapid decrease in both P and fr around the Curie temperature Tc=300K. However, much below Tc, the fr shows a step-like anomaly around 165 K (195 K) while cooling (warming), which we attribute to a structural phase transition from high temperature rhombohedral (R3̄c) to low temperature orthorhombic (Imma) phase. The step-like anomaly in fr- versus T disappears in a field of 300 G. Fractional changes as large as 19% in Δf r/fr, and 10% in ΔP/P are observed under H=1 kG around Tc. Our study suggests that the rf resonance technique is a versatile tool to study the magnetization dynamics as well as to investigate the structural phase transition in manganites. © 2010 Elsevier B.V. All rights reserved.
Source Title: Journal of Magnetism and Magnetic Materials
ISSN: 03048853
DOI: 10.1016/j.jmmm.2010.04.021
Appears in Collections:Staff Publications

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