Bandwidth control effects in electron doped manganite La0.7−xYxCe0.3MnO3 thin films

Bajaj, Kavita; Bagwe, Vivas; Jesudasan, John; Raychaudhuri, Pratap

doi:10.1016/j.ssc.2006.04.016

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…One can see in this table that cell volume, bond length d Mn-O and bond angle θ Mn-O-Mn exhibit only a slight decrease, with the increase of Na, due to the small size of Na substituting the bigger Ba ion and especially to the important loss of Na. This is consistent with recent works [12,13] showing that lattice parameters are mainly affected by the size effect of A perovskite site, inducing a significant change in the Mn-O-Mn bond angle.…”

Section: Methodssupporting

confidence: 93%

Synthesis, structural, magnetic and electrical properties of nominal La_0.67Ba_0.33-xNa_xMnO₃(0 ≤ x ≤ 0.33) manganites

Hcini

Zemni

Boudard

et al. 2012

EPJ Web of Conferences

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Abstract.Complete nominal solid solutions La 0.67 Ba 0.33-x Na x MnO 3 (0 ≤ x ≤ 0.33) have been elaborated by ceramic route at 1200°C. ICPAES chemical analysis and XRD Rietveld structure refinement revealed that the nominal Na content is not achieved by our ceramic method. The chemical formula should be rather written as La α Ba β Na λ MnO 3-δ with a significantly lower Na content (λ), than the nominal one (x), and with a slight deficit (δ) in oxygen content, leading to the appearance of two minor secondary phases identified as Mn 3 O 4 and Na 0.55 Mn 2 O 4 . 1.5H 2 O. Magnetization and electrical resistance vs. temperature show paramagnetic/semiconductor -ferromagnetic/metallic transitions with only a slight decrease in magnetic and electrical transition temperatures when Na content increases. Such amount of this decrease is not expected according to the nominal Na content giving a significant difference between nominal and experimental Mn 4+ /Mn 3+ ratios.

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Section: Methodssupporting

confidence: 93%

Synthesis, structural, magnetic and electrical properties of nominal La_0.67Ba_0.33-xNa_xMnO₃(0 ≤ x ≤ 0.33) manganites

Hcini

Zemni

Boudard

et al. 2012

EPJ Web of Conferences

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“…The decrease of T C is mainly attributed to a decrease of the Mn-O-Mn bond angle due to decrease of the mean ionic radius r A of the A-site cation. This is consistent with the decrease of the carrier bandwidth (W) of the e g band resulting from an overlap between 3d orbitals of the metallic ions and 2p orbitals of the oxygen ions [25]. In addition to the mentioned decrease of T C with increasing Fe concentration, the transition width also increases quite appreciably with increasing Fe concentration, suggesting suppression of the double-exchange mechanism.…”

Section: Magnetic Propertiessupporting

confidence: 82%

Structural and magnetic properties of (La0.70−xYx)Ba0.30Mn1−xFexO3 perovskites simultaneously doped on A and B sites (0.0≤x≤0.30)

Kallel¹,

Abdelkhalek²,

Kallel³

et al. 2010

Journal of Alloys and Compounds

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“…The LCeMO films were characterized by energy dispersive spectroscopy and x-ray diffraction analysis, described elsewhere [27]. The thickness of the films is 120 nm.…”

Section: Resultsmentioning

confidence: 99%

“…The La 0.7 Ce 0.3 MnO 3 films were grown on (001) LaAlO 3 (LAO) substrate by the pulsed laser deposition technique. The sample preparation and characterization are described elsewhere [27]. The resistance was determined as a function of temperature for various dc currents in the absence of magnetic field by using a conventional four-probe method in a closed cycle cryostat.…”

Section: Methodsmentioning

confidence: 99%

Electroresistive effects in electron doped manganite La_0.7Ce_0.3MnO₃thin films

Bajaj¹,

Jesudasan²,

Bagwe³

et al. 2007

J. Phys.: Condens. Matter

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The influence of electric current on the transport behaviour of La 0.7 Ce 0.3 MnO 3 thin epitaxial films on (001) LaAlO 3 substrate is studied. Measurements were carried out in the regime of low current densities (0.0325-32.5 A cm −2 ), for dc current in the absence of magnetic field. Significant reduction of the peak resistance (R p ) with monotonic increase in the metal-insulator transition temperature (T p ) was found with increasing bias current. The voltage current characteristics at various temperatures above and below T p show nonlinearity for small currents. The behaviours of the resistance with the current are similar at various temperatures: an initial decrease with increasing current and then a levelling off. The magnetoresistance (MR) measurement under a field of 1 T revealed that it is maximum at the temperature near T p at which the electroresistance (ER) is also maximum. The variation of resistance with electric field and magnetic field is non-hysteretic. We explain the origin of the observed ER and MR in our samples on the basis of double-exchange interaction and the phase separation phenomenon.

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Bandwidth control effects in electron doped manganite La0.7−xYxCe0.3MnO3 thin films

Cited by 8 publications

References 14 publications

Synthesis, structural, magnetic and electrical properties of nominal La_0.67Ba_0.33-xNa_xMnO₃(0 ≤ x ≤ 0.33) manganites

Synthesis, structural, magnetic and electrical properties of nominal La_0.67Ba_0.33-xNa_xMnO₃(0 ≤ x ≤ 0.33) manganites

Structural and magnetic properties of (La0.70−xYx)Ba0.30Mn1−xFexO3 perovskites simultaneously doped on A and B sites (0.0≤x≤0.30)

Electroresistive effects in electron doped manganite La_0.7Ce_0.3MnO₃thin films

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Bandwidth control effects in electron doped manganite La0.7−xYxCe0.3MnO3 thin films

Cited by 8 publications

References 14 publications

Synthesis, structural, magnetic and electrical properties of nominal La0.67Ba0.33-xNaxMnO3(0 ≤ x ≤ 0.33) manganites

Synthesis, structural, magnetic and electrical properties of nominal La0.67Ba0.33-xNaxMnO3(0 ≤ x ≤ 0.33) manganites

Structural and magnetic properties of (La0.70−xYx)Ba0.30Mn1−xFexO3 perovskites simultaneously doped on A and B sites (0.0≤x≤0.30)

Electroresistive effects in electron doped manganite La0.7Ce0.3MnO3thin films

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Synthesis, structural, magnetic and electrical properties of nominal La_0.67Ba_0.33-xNa_xMnO₃(0 ≤ x ≤ 0.33) manganites

Synthesis, structural, magnetic and electrical properties of nominal La_0.67Ba_0.33-xNa_xMnO₃(0 ≤ x ≤ 0.33) manganites

Electroresistive effects in electron doped manganite La_0.7Ce_0.3MnO₃thin films