Insulator-to-metal transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mo>(</mml:mo><mml:mi>R</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">Ca</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mi mathvariant="normal">V</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Sage, M. H.; Blake, Graeme R.; Palstra, Thomas

doi:10.1103/physrevb.77.155121

Cited by 27 publications

(20 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, modifications of the one-electron bandwidth through changes in the crystal structure induced by chemical substitution are also expected (Refs. [8][9][10][11][12][13] and [26]), and the substitutional disorder can strongly affect the transport and optical properties [27][28][29][30]. Calcium doped PrVO 3 can be considered as a special case because the ionic radii of Pr 3+ (1.126Å) and Ca 2+ (1.120Å) are almost identical (see Ref.…”

Section: Introductionmentioning

confidence: 99%

Spin and orbital disordering by hole doping inPr1−xCaxVO3<

et al. 2016

View full text Add to dashboard Cite

High-resolution powder x-ray diffraction and single-crystal neutron diffraction were used to investigate the crystal structure and magnetic ordering of the compound Pr 1−x Ca x VO 3 (0 x 0.3), which undergoes an insulator-to-metal transition for x ∼ 0.23. Since the ionic radii of Pr 3+ and Ca 2+ are almost identical and structural disorder is minimal, Pr 1−x Ca x VO 3 is a good model system for the influence of hole doping on the spin and orbital correlations in transition metal oxides. The end member PrVO 3 is a Mott-Hubbard insulator, which exhibits a structural phase transition at T S = 180 K from an orthorhombic to a monoclinic structure with space groups Pbnm and P 2 1 /b, respectively. This transition is associated with the onset of orbital ordering and strong Jahn-Teller distortions of the VO 6 octahedra. Antiferromagnetic C-type order with vanadium moments oriented in the ab plane is observed below T N = 140 K. Upon cooling, the vanadium moments induce a progressive magnetic polarization of the praseodymium sublattice, resulting in a ferrimagnetic structure with coexisting modes (C x , F y ) and (F x , C y ). In the insulating range of the Pr 1−x Ca x VO 3 phase diagram, Ca doping reduces both the orbital and magnetic transition temperatures so that T S = 108 K and T N = 95 K for x = 0.20. The Jahn-Teller distortions and ordered vanadium moments also decrease upon doping. In a metallic sample with x = 0.30, Jahn-Teller distortions and long-range orbital ordering are no longer observable, and the average crystal structure remains orthorhombic down to low temperature. However, broadening of some lattice Bragg reflections indicate a significant increase in lattice strain. Antiferromagnetic short-range order with a weak ordered moment of 0.14(3) μ B per vanadium atom could still be observed on the vanadium site below T ∼ 60 K. We discuss these observations in terms of doping-induced spin-orbital polaron formation.

show abstract

Section: Introductionmentioning

confidence: 99%

Spin and orbital disordering by hole doping inPr1−xCaxVO3<

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Renewed interests in V-based perovskite oxides arise owing to the possibility of tuning their properties, such as electric and magnetic through structural modification, chemical doping, and/or pressure. [1][2][3][4][5][6][7] In this respect, various studies have recently been conducted on the bulk and thin film of RVO 3 , wherein R stands for rare earth elements. [2][3][4][5][6][7][8][9] These studies demonstrate that V, in these systems, is in a 3+ oxidation state and attains a 3d 2 ͑t 2g 2 e g 0 ͒ electron configuration.…”

mentioning

confidence: 99%

“…Although this enhancement in the oxidation state of vanadium generates the holes in our samples, the presence of defect states localize the charge carriers. [1][2][3][4] The delocalization of charge carriers are further hindered by the absence of V in the lattices which randomly decouples the overlap of V-O-V wave functions. This shows that V stoichiometry plays a decisive role in determining its electrical properties.…”

mentioning

confidence: 99%

“…Further, the value of eff is larger than the expected value of spin-only V magnetic moments, suggesting that partial contributions arise from the orbital moment as demonstrated by various researchers in the past. [2][3][4][5][6][7][8][9] In summary, we studied the impact of V deficiency on the properties of LaVO 3 . It demonstrates that the V deficiency induces multiple oxidations state of V and plays a decisive role in determining its physical properties .…”

mentioning

confidence: 99%

See 1 more Smart Citation

Effect of vanadium deficiency on properties of polycrystalline LaVO3

Gharetape

Singh

Razavi

et al. 2011

Applied Physics Letters

View full text Add to dashboard Cite

We report the influence of V deficiency on structure, transport, and magnetic properties of polycrystalline LaVO 3 . Up to 10% V-deficient samples were synthesized using standard solid state chemistry route. Structural and spectroscopic studies show that it intricately modifies lattice parameters and oxidation states of V. Further temperature dependent resistivity data reveal that V deficiency induces an enhancement in the resistivity and activation energy. The paramagnetic moment of these samples depends on net V composition while all samples exhibit a paramagnetic-to-antiferromagnetic transition at about 140 K. These distinct properties are understood owing to the presence of multiple oxidations states of V, predominantly V 3+ and V 4+ , in nonstoichiometric LaVO 3 .

show abstract

“…Indeed, a number of combinations -either at A site (with two or more lanthanides) or at B site (with two or more transition metals) -were examined and novel or unusual physical properties were discovered, such as the half-metallic antiferromagnetism [14] and metal-insulator transitions [15].…”

Section: Introductionmentioning

confidence: 99%