Journal ArticleDOI
Effect of alkaline-earth and transition metals on the electrical transport of double perovskites
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In this article, the transport properties of A2BMoO6 (A=Ca, Sr, and Ba; B=Cr, Mn, and Fe) were investigated from studies of x-ray diffraction, thermoelectric power (TEP) S, and resistivity ρ measurements over a wide temperature range (20-900 K).Abstract:
The transport properties of A2BMoO6 (A=Ca, Sr, and Ba; B=Cr, Mn, and Fe) crystals are investigated from studies of x-ray diffraction, thermoelectric power (TEP) S, and resistivity ρ measurements over a wide temperature range (20–900 K). The resistivity of A2FeMoO6 (A=Ca, Sr, and Ba) crystals shows a metallic character and its analysis suggests that the electron-electron scattering is one of the contributions governing the conduction mechanism of these compounds. On the other hand, Ca2MnMoO6 shows an insulator-metal transition similar to that reported in rare earth nickelate [Phys. Rev. B 45, 8209 (1992)]. The conductivity σ(T) data of Sr2CrMoO6 can be best fitted in terms of simultaneous contributions to σ with an activated-type process and variable range hopping (VRH) mechanism. In the case of Sr2MnMoO6, ρ(T) behavior follows an activated-type hopping for T>400 K whereas for T<85 K it can be described satisfactorily by VRH mechanism. For all the compounds, TEP exhibits negative values (n type) except for...read more
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A2B′B″O6 perovskites: A review
Sami Vasala,Maarit Karppinen +1 more
TL;DR: A survey of the literature for ca. one thousand B-site substituted perovskite oxides can be found in this article, together with their electronic and magnetic properties and properties.
Journal ArticleDOI
Thermoelectric properties of double-perovskite oxide Sr2-xM xFeMoO6 [M = Ba, La)
Journal ArticleDOI
Influence of Ni/Mo ratio on structural and electrical properties of double perovskite system Sr 2 Ni 1+x Mo 1−x O 6−δ
TL;DR: In this article, a double perovskite tetragonal phase with space group I4/m as a major phase and NiO and MoO4 as minor phases were observed.
Journal ArticleDOI
Half-Metallic Ferromagnetism in Double Perovskite Ca2CoMoO6 Compound : DFT + U Calculations
TL;DR: In this paper, a systematic investigation on magnetism and spin-resolved electronic properties in double perovskite Ca2CoMoO6 compound was performed by using the full-potential augmented plane wave plus local orbitals (APW+lo) method within the generalized gradient approximation (GGA-PBE) and GGA-pBE+U scheme.
Journal ArticleDOI
First principles analysis of oxygen vacancy formation and migration in Sr2BMoO6 (B = Mg, Co, Ni)
TL;DR: In this article, a detailed first-principles investigation on the stoichiometric and oxygen-deficient structures of double perovskites, namely, Sr2BMoO6 (B = Mg, Co and Ni), using the density functional theory (DFT) method plus Hubbard U, was presented.
References
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TL;DR: The Fermi Glass and the Anderson Transition as discussed by the authorsermi glass and Anderson transition have been studied in the context of non-crystalline Semiconductors, such as tetrahedrally-bonded semiconductors.
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Boris I Shklovskii,A. L. Efros +1 more
TL;DR: In the last fifteen years, there has been a noticeable shift towards impure semiconductors -a shift which came about because it is precisely the impurities that are essential to a number of major semiconductor devices.
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TL;DR: A review of the literature on mixed-valence manganites, placing new results in the context of established knowledge of these materials, and other magnetic semiconductors, is given in this paper.
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Metal-Insulator Transition
TL;DR: A general survey of the metal-nonmetal transition is given in this article with particular emphasis on the following points: (a) is the transition of first order; (b) can one observe the transition; and (c) how the transition affected when it occurs in ionic lattices or polar liquids.