title: Charge transport mechanisms in sol-gel grown La0.7Pb0.3MnO3/LaAlO3manganite films.
abstract: In this communication, structural, microstructural, transport and magnetotransport properties are reported for La0.7Pb0.3MnO3/LaAlO3(LPMO/LAO) manganite films having different thicknesses. All the films were irradiated with 200 MeV Ag+15swift heavy ions (SHI). Films were grown using the sol-gel method by employing the acetate precursor route. Structural measurements were carried out using the X-ray diffraction (XRD) method at room temperature, while atomic force microscopy (AFM) was performed for the surface morphology. Temperature dependent resistivity under different applied magnetic fields for all the films shows metal to insulator transition at temperature TP. In addition to the metal to insulator transition at TP, the films also exhibit low temperature resistivity upturn behavior. Resistivity, TPand upturn behavior are highly influenced by the film thickness, applied magnetic field and irradiation. To understand the nature of charge transport for the low temperature resistivity behavior and metallic and insulating (semiconducting) regions, various models and mechanisms have been verified and the most suitable mechanism has been found for each region in the resistivity curves. Magnetoresistance (MR) is affected by temperature, film thickness and irradiation. MR behavior has been understood in terms of combined and separate contributions from grains and grain boundaries in the films.
authors.affiliation: Department of Physics, Saurashtra University, Rajkot - 360 005, India. piyush.physics@gmail.com.
authors.forename: Eesh
authors.initials: E
authors.lastname: Vaghela
authors.affiliation: Department of Physics, Saurashtra University, Rajkot - 360 005, India. piyush.physics@gmail.com.
authors.forename: M J
authors.initials: MJ
authors.lastname: Keshvani
authors.affiliation: Department of Physics, Saurashtra University, Rajkot - 360 005, India. piyush.physics@gmail.com.
authors.forename: Keval
authors.initials: K
authors.lastname: Gadani
authors.affiliation: Department of Physics, Saurashtra University, Rajkot - 360 005, India. piyush.physics@gmail.com.
authors.forename: Zalak
authors.initials: Z
authors.lastname: Joshi
authors.affiliation: Department of Physics, Saurashtra University, Rajkot - 360 005, India. piyush.physics@gmail.com.
authors.forename: Hetal
authors.initials: H
authors.lastname: Boricha
authors.affiliation: UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, 452 001, India.
authors.forename: K
authors.initials: K
authors.lastname: Asokan
authors.affiliation: Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi - 110 0067, India.
authors.forename: D
authors.initials: D
authors.lastname: Venkateshwarlu
authors.affiliation: Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi - 110 0067, India.
authors.forename: V
authors.initials: V
authors.lastname: Ganesan
authors.affiliation: Department of Physics, Saurashtra University, Rajkot - 360 005, India. piyush.physics@gmail.com.
authors.forename: N A
authors.initials: NA
authors.lastname: Shah
authors.affiliation: Department of Physics, Saurashtra University, Rajkot - 360 005, India. piyush.physics@gmail.com.
authors.forename: P S
authors.identifier: http://orcid.org/0000-0003-3444-2264
authors.initials: PS
authors.lastname: Solanki