Journal ArticleDOI
Transport and magnetic properties of laser ablated La0.7Ce0.3MnO3 films on LaAlO3
TLDR
In this paper, the magnetotransport properties of laser ablated La07Ce03MnO3 films on LaAlO3, and the effect of varying the ambient oxygen pressure during growth and the film thickness were investigated.Abstract:
La07Ce03MnO3 is a relatively new addition to the family of colossal magnetoresistive manganites, in which the cerium ion is believed to be in the Ce4+ state In this article, we report the magnetotransport properties of laser ablated La07Ce03MnO3 films on LaAlO3, and the effect of varying the ambient oxygen pressure during growth and the film thickness We observe that the transport and magnetic properties of the film depend on the oxygen pressure, surface morphology, film thickness, and epitaxial strain The films were characterized by x-ray diffraction using a four-circle goniometer We observe an increase in the metal-insulator transition temperature with decreasing oxygen pressure This is in direct contrast to the oxygen pressure dependence of La07Ca03MnO3 films and suggests the electron doped nature of the La07Ce03MnO3 system With decreasing film thickness we observe an increase in the metal-insulator transition temperature This is associated with a compression of the unit cell in the a-b plane due to epitaxial strain On codoping with 50% Ca at the Ce site, the system (La07Ca015Ce015MnO3) is driven into an insulating state suggesting that the electrons generated by Ce4+ are compensated by the holes generated by Ca2+, thus making the average valence at the rare-earth site 3+ as in the parent material LaMnO3La07Ce03MnO3 is a relatively new addition to the family of colossal magnetoresistive manganites, in which the cerium ion is believed to be in the Ce4+ state In this article, we report the magnetotransport properties of laser ablated La07Ce03MnO3 films on LaAlO3, and the effect of varying the ambient oxygen pressure during growth and the film thickness We observe that the transport and magnetic properties of the film depend on the oxygen pressure, surface morphology, film thickness, and epitaxial strain The films were characterized by x-ray diffraction using a four-circle goniometer We observe an increase in the metal-insulator transition temperature with decreasing oxygen pressure This is in direct contrast to the oxygen pressure dependence of La07Ca03MnO3 films and suggests the electron doped nature of the La07Ce03MnO3 system With decreasing film thickness we observe an increase in the metal-insulator transition temperature This is associated with a compression of the unit cell in the a-b read more
Citations
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Journal ArticleDOI
XPS investigation of Mn valence in lanthanum manganite thin films under variation of oxygen content
TL;DR: In this article, a comparative x-ray photoemission (XPS) study of epitaxial and LCeMO thin films is presented, focusing on the exchange splitting of the Mn $3s$ core level peak.
Journal ArticleDOI
Direct observation of electron doping in La0.7Ce0.3MnO3 using x-ray absorption spectroscopy
Chandrima Mitra,Zhiwei Hu,Pratap Raychaudhuri,Steffen Wirth,S. I. Csiszar,H. H. Hsieh,Hong-Ji Lin,C. T. Chen,Liu Hao Tjeng +8 more
TL;DR: In this paper, an x-ray absorption spectroscopic (XAS) study on thin films of thin cerium and manganese was conducted, showing that the cerium is in the Ce(IV) valence state, and the manganite is present in a mixture of the two states.
Posted Content
Direct observation of electron doping in La0.7Ce0.3MnO3
Chandrima Mitra,Z. Hu,Pratap Raychaudhuri,Steffen Wirth,S. I. Csiszar,H. H. Hsieh,H. J. Lin,C. T. Chen,Liu Hao Tjeng +8 more
Journal ArticleDOI
p–n diode with hole- and electron-doped lanthanum manganites
Chiranjib Mitra,Pratap Raychaudhuri,G. Köbernik,Kathrin Dörr,K.-H. Müller,Ludwig Schultz,R. Pinto +6 more
TL;DR: In this article, an epitaxial trilayer (La0.7Ca0.3MnO3/SrTiO3/) was constructed with asymmetric currentvoltage characteristics similar to a p-n diode.
Journal ArticleDOI
Growth of epitaxial and polycrystalline thin films of the electron doped system La1−xCexMnO3 through pulsed laser deposition
TL;DR: In this paper, a broad metal insulator transition (MIT) is resolved into two peaks, suggesting the presence of a second (impurity) phase, which is identified as unreacted CeO2 by the intensity analysis of the x-ray diffraction (XRD) data.
References
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Interaction between the d -Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure
TL;DR: In this paper, it was shown that both electrical conduction and ferromagnetic coupling in these compounds arise from a double exchange process, and a quantitative relation was developed between electrical conductivity and the Ferromagnetic Curie temperature.
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Considerations on Double Exchange
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Structural effects on the magnetic and transport properties of perovskite A 1-x A' x MnO 3 (x=0.25, 0.30)
Paolo G. Radaelli,G. Iannone,M. Marezio,Harold Y. Hwang,Sang-Wook Cheong,James D. Jorgensen,Dimitri N. Argyriou +6 more
TL;DR: In this article, the evolution of the structural properties of the metal-insulator transition was determined as a function of temperature, average $A$-site radius and applied pressure for the ''optimal'' doping range $x=0.25,$ 0.30, by using high-resolution neutron powder diffraction.
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Oxidation-reduction behavior of undoped and Sr-doped LaMnO3 nonstoichiometry and defect structure
TL;DR: In this paper, it was shown that Sr doping caused the LaMnO{sub 3} to dissociate at higher oxygen activities than those necessary for undoped La mnO {sub 3}.