Faculty Sponsor

Dr. Maitri Warusawithana

Faculty Sponsor College

College of Arts and Sciences

Faculty Sponsor Department

Physics

Location

SOARS Virtual Conference

Presentation Website

https://unfsoars.domains.unf.edu/2021/posters/mapping-out-the-electronic-and-magnetic-transitions-in-mixed-valent-la1-xsrxmno3-thin-films/

Keywords

SOARS (Conference) (2021 : University of North Florida) – Archives; SOARS (Conference) (2021 : University of North Florida) – Posters; University of North Florida -- Students -- Research – Posters; University of North Florida. Office of Undergraduate Research; University of North Florida. Graduate School; College students – Research -- Florida – Jacksonville – Posters; University of North Florida – Undergraduates -- Research – Posters; University of North Florida. Department of Physics -- Research -- Posters

Abstract

The rich phase diagram in mixed-valent manganites has been intensely studied in bulk crystals as a function of chemical doping. Here we study the effect of doping in La1-xSrxMnO3 thin films by varying the Sr/La ratio between samples. These thin films are grown using ozone assisted molecular beam epitaxy with carefully controlled stoichiometry for a range of doping from x = 0.0 to x = 0.5. Our electronic measurements reveal a crossover from a Mott insulator to a metallic ground state as x is increased. In the metallic ground state we observe a metal-to-insulator transition coincident with a ferromagnetic-to-paramagnetic ordering transition consistent with the double exchange interaction with higher, doping dependent transition temperatures compared to those reported for bulk La1-xSrxMnO3 crystals. We will also discuss the magnetic ordering transitions observed in the low doping regime (x<0.17) where an insulating ground state is observed and compare these transitions with those reported for bulk La1-xSrxMnO3 crystals. *NSF Grant No. DMR-16-26332

Rights Statement

http://rightsstatements.org/vocab/InC/1.0/

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Apr 7th, 12:00 AM Apr 7th, 12:00 AM

Mapping out the electronic and magnetic transitions in mixed-valent La1-xSrxMnO3 thin films

SOARS Virtual Conference

The rich phase diagram in mixed-valent manganites has been intensely studied in bulk crystals as a function of chemical doping. Here we study the effect of doping in La1-xSrxMnO3 thin films by varying the Sr/La ratio between samples. These thin films are grown using ozone assisted molecular beam epitaxy with carefully controlled stoichiometry for a range of doping from x = 0.0 to x = 0.5. Our electronic measurements reveal a crossover from a Mott insulator to a metallic ground state as x is increased. In the metallic ground state we observe a metal-to-insulator transition coincident with a ferromagnetic-to-paramagnetic ordering transition consistent with the double exchange interaction with higher, doping dependent transition temperatures compared to those reported for bulk La1-xSrxMnO3 crystals. We will also discuss the magnetic ordering transitions observed in the low doping regime (x<0.17) where an insulating ground state is observed and compare these transitions with those reported for bulk La1-xSrxMnO3 crystals. *NSF Grant No. DMR-16-26332

https://digitalcommons.unf.edu/soars/2021/spring_2021/109

 

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