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IJPAP Vol.45(05) [May 2007] >


Title: Heating of manganites by magnetic component of microwave
Authors: Singh, R J
Keywords: Manganites
Electron paramagnetic resonance
Microwave heating
Issue Date: May-2007
Publisher: CSIR
IPC CodeG01R27/02; H01F1/00
Abstract: When the dependence of EPR spectra of La₀․₆₇ Pb₀․₃₃ MnO₃ , La₀․₆Pb₀․₄ MnO₃ , La₀․₇ Ba․₃ MnO₃ and La₀․₆₇ Sr₀․₃₃ MnO₃ on microwave power (1-200mW) applied in the EPR instrument was investigated, it was observed that the samples became unusually hot on high microwave power levels. The cause of heat generation has been explained as interaction of the spin of eg electron of Mn³⁺ with the magnetic component of microwave field which ultimately leads to Debye type of relaxation of a physical ensemble, i.e., spin-orbital-lattice polaron . The polaron so created is found to be of 11 Å size and consists of Mn³⁺ ion, its nearest neighbours Mn⁴⁺ and La³⁺ ions and the alkaline earth ions along with oxygen octahedra surrounding Mn-ion sites.
Page(s): 454-458
ISSN: 0019-5596
Source:IJPAP Vol.45(05) [May 2007]

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