~(57)Fe-ion implantation in pulse laser deposited La_(0.75)Ca_(0.25) MnO_3 films: Conversion electron Mossbauer spectroscopy and X-ray diffraction studies

摘要

Oriented La_(0.75)Ca_(0.25) MnO_3(LCMO)films have been deposited by pulsed laser deposition (PLD)method on (100) LaAlO_3 substrates. Ion-beam technique is usedto introduce a very low concentration of ~(57)Fe in LCMO film.The deposited films were subjected to 100 keV ~(57)Fe~+implantation with different fluences at room temperature. Themain motivation of this work was to study the influence ofimplantation on the transport mechanism in materials exhibitingcolossal magnetoresistance (CMR) property. It is observed that Feimplantation drastically affects the structural and magneto-transport properties. The samples were characterized using the X-ray diffraction (XRD) technique, conversion electron Mossbauerspectroscopy (CEMS) and resistance-temperature (R-T) measurements.