57Fe-ion implantation in pulse laser deposited La0.75Ca0.25MnO3 films: Conversion electron M??ssbauer spectroscopy and X-ray diffraction studies

摘要

Oriented La_0.75Ca_0.25MnO₃ (LCMO) films have been deposited by pulsed laser deposition (PLD) method on (100) LaAlO₃ substrates. Ion-beam technique is used to introduce a very low concentration of 57Fe+ in LCMO film. The deposited films were subjected to 100 keV 57Fe+ implantation with different fluences at room temperature. The main motivation of this work was to study the influence of implantation on the transport mechanism in materials exhibiting colossal magnetoresistance (CMR) property. It is observed that Fe implantation drastically affects the structural and magneto-transport properties. The samples were characterized using the X-ray diffraction (XRD) technique, conversion electron M??ssbauer spectroscopy (CEMS) and resistance temperature (e?‘…a€“e?‘?) measurements.