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Title: Fe-doping and strain effects on structural and magnetotransport properties in La{sub 2/3}Ca{sub 1/3}Mn{sub 1-y}Fe{sub y}O{sub 3} thin films.

Abstract

The influence of {sup 57}Fe-doping and strain effects on the structural and magnetotransport properties of undoped and lightly doped {sup 57}Fe (1 and 3% at Mn site) La{sub 2/3}Ca{sub 1/3}MnO{sub 3} thin films and bulk powder samples have been studied. Thin films were grown on (100)-SrTiO{sub 3} (STO) and (100)-LaAlO{sub 3} (LAO) single crystal substrates, via high O{sub 2} pressure (500 mTorr) using dc magnetron sputtering. Conversion electron Moessbauer (CEM) spectra measured at room temperature in the paramagnetic regime of the Fe-doped samples do not show significant differences in the isomeric shift for the case of the La{sub 2/3}Ca{sub 1/3}MnO{sub 3} films doped with 1 and 3% iron. The isomeric shift values correspond to the presence of Fe in the 3+ state with octahedral coordination, thus indicating that Fe is incorporated into the structure by substituting Mn. The absence of further states in the spectra indicates that Fe is not involved in forming other additional impurity phases. The x-ray {theta}-2{theta} scan showed that all thin films on LAO and STO have single phase and c-axis strong orientation along the growth direction and the Fe doping gives rise to a relaxation of the epitaxial strain. Finally, we have observed that themore » saturation magnetization, Curie temperature, metal-insulator transition, and magnetoresistance vary nonmonotonically with increased Fe concentration. This behavior can be understood in terms of competing influences from the strain relaxation, which enhances the tendency to order ferromagnetically, and the reduced double exchange, which is detrimental to the ferromagnetic order.« less

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); COLCIENCIAS Projects; Univ. de Antiquia Grant
OSTI Identifier:
940952
Report Number(s):
ANL/MSD/JA-62860
Journal ID: ISSN 1098-0121; TRN: US200824%%314
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Phys. Rev. B
Additional Journal Information:
Journal Volume: 77; Journal Issue: 2008; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; CURIE POINT; IRON OXIDES; MAGNETORESISTANCE; STRAINS; THIN FILMS; LANTHANUM OXIDES; CALCIUM OXIDES; MANGANESE OXIDES; DOPED MATERIALS; IRON 57; PHASE STUDIES

Citation Formats

Arnache, O, Girata, D, Hoffmann, A, Materials Science Division, and Univ. Antioquia. Fe-doping and strain effects on structural and magnetotransport properties in La{sub 2/3}Ca{sub 1/3}Mn{sub 1-y}Fe{sub y}O{sub 3} thin films.. United States: N. p., 2008. Web. doi:10.1103/PhysRevB.77.214430.
Arnache, O, Girata, D, Hoffmann, A, Materials Science Division, & Univ. Antioquia. Fe-doping and strain effects on structural and magnetotransport properties in La{sub 2/3}Ca{sub 1/3}Mn{sub 1-y}Fe{sub y}O{sub 3} thin films.. United States. https://doi.org/10.1103/PhysRevB.77.214430
Arnache, O, Girata, D, Hoffmann, A, Materials Science Division, and Univ. Antioquia. 2008. "Fe-doping and strain effects on structural and magnetotransport properties in La{sub 2/3}Ca{sub 1/3}Mn{sub 1-y}Fe{sub y}O{sub 3} thin films.". United States. https://doi.org/10.1103/PhysRevB.77.214430.
@article{osti_940952,
title = {Fe-doping and strain effects on structural and magnetotransport properties in La{sub 2/3}Ca{sub 1/3}Mn{sub 1-y}Fe{sub y}O{sub 3} thin films.},
author = {Arnache, O and Girata, D and Hoffmann, A and Materials Science Division and Univ. Antioquia},
abstractNote = {The influence of {sup 57}Fe-doping and strain effects on the structural and magnetotransport properties of undoped and lightly doped {sup 57}Fe (1 and 3% at Mn site) La{sub 2/3}Ca{sub 1/3}MnO{sub 3} thin films and bulk powder samples have been studied. Thin films were grown on (100)-SrTiO{sub 3} (STO) and (100)-LaAlO{sub 3} (LAO) single crystal substrates, via high O{sub 2} pressure (500 mTorr) using dc magnetron sputtering. Conversion electron Moessbauer (CEM) spectra measured at room temperature in the paramagnetic regime of the Fe-doped samples do not show significant differences in the isomeric shift for the case of the La{sub 2/3}Ca{sub 1/3}MnO{sub 3} films doped with 1 and 3% iron. The isomeric shift values correspond to the presence of Fe in the 3+ state with octahedral coordination, thus indicating that Fe is incorporated into the structure by substituting Mn. The absence of further states in the spectra indicates that Fe is not involved in forming other additional impurity phases. The x-ray {theta}-2{theta} scan showed that all thin films on LAO and STO have single phase and c-axis strong orientation along the growth direction and the Fe doping gives rise to a relaxation of the epitaxial strain. Finally, we have observed that the saturation magnetization, Curie temperature, metal-insulator transition, and magnetoresistance vary nonmonotonically with increased Fe concentration. This behavior can be understood in terms of competing influences from the strain relaxation, which enhances the tendency to order ferromagnetically, and the reduced double exchange, which is detrimental to the ferromagnetic order.},
doi = {10.1103/PhysRevB.77.214430},
url = {https://www.osti.gov/biblio/940952}, journal = {Phys. Rev. B},
issn = {1098-0121},
number = 2008,
volume = 77,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 2008},
month = {Tue Jan 01 00:00:00 EST 2008}
}