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Doped rare-earth perovskite manganites shows a strong interplay between charge, spin and lattice degrees of freedom leading to a rich phase diagram with varieties of electronic, magnetic and structural phases, competing and cooperating with each other. These materials exhibit colossal magnetoresistive (CMR) property near the Curie temperature. Due to these properties manganites find their possible applications in advanced electronic devices like magnetic read heads, magnetic data storage devices, spintronic devices, magnetic sensors, magnetic refrigeration etc. which has boosted the importance of the study of these compounds. We propose here a double exchange model Hamiltonian consisting of charge ordering as an extra-mechanism in presence of electron-phonon interaction to explain the observed CMR phenomenon. The CMR phenomenon has been tried to be explained through the study of temperature dependent magnetization, electron occupation number, magnetic susceptibility, velocity of sound, ultrasonic attenuation and Raman spectra. In all these studies we observe clear signature of CMR behavior.
About the author
Dr. Saswati Panda is an avid researcher on Condensed Matter Physics with more than 25 International Journal publications and many paper presentations at Conferences. Possessing 18 years of teaching experience in Engineering colleges, she has authored a book named "Applied Physics". She has been awarded the Best Poster Presenter at a conference.
