Crystal and magnetic structure of CeVO3

Reehuis, M.; Ulrich, C.; Pattison, Philip; Miyasaka, S.; Tokura, Y.; Keimer, B.

doi:10.1140/epjb/e2008-00277-7

Cited by 49 publications

(77 citation statements)

References 24 publications

(77 reference statements)

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“…3). This behavior was also observed for CeVO 3 and TbVO 3 , where it was ascribed to the influence of the lanthanide moments, which become polarized in the presence of the exchange field produced by the antiferromagnetic vanadium sublattice [15,16]. A detailed description of the magnetic ordering pattern of Pr 1−x Ca x VO 3 is given in Sec.…”

Section: A Structural and Magnetic Phase Transitionsmentioning

confidence: 66%

“…Within the monoclinic phase at 15 K, the doping-induced reduction of the cell volume (3.1%) is similar to the value determined at 295 K, but the decrease of the b axis is larger than that of the c axis, indicating the presence of Jahn-Teller distortions of the VO 6 octahedra. Usually a change of the lattice parameters is strongly influenced by the ionic size and the valence of the R n+ ions, as shown earlier for rare-earth vanadates RVO 3 [15][16][17][18]. In the system Pr 1−x Ca x VO 3 , the influence of the ionic size effect at the R site should be negligible since the ionic radii of Pr 3+ and Ca 2+ are almost identical (see Ref.…”

Section: B Influence Of Ca Doping On the Crystal Structurementioning

confidence: 69%

“…In the present paper, we have performed single-crystal neutron diffraction experiments to investigate these transitions by measuring the temperature dependence of corresponding Bragg reflections. In earlier studies of insulating vanadates, the structural phase transition temperatures were extracted from intensity changes of strong nuclear Bragg reflections [3,[15][16][17]. Due to the spontaneous onset of orbital ordering, which is accompanied by Jahn-Teller distortions in the VO 6 octahedra, the crystal structure changes upon cooling from an orthorhombic to a monoclinic structure (see Sec.…”

Section: A Structural and Magnetic Phase Transitionsmentioning

confidence: 99%

“…The influence of the orbital degrees of freedom of the d electrons on the magnetic and transport properties of metal-oxide compounds has attracted much attention in recent years [1]. Mott-insulating orthovanadates of chemical composition RVO 3 (R = Y or a trivalent rare-earth metal) have been widely studied as a model system of the coupling between the spin and orbital degrees of freedom [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. The valence electrons on the V 3+ ions (electron configuration 3d…”

Section: Introductionmentioning

confidence: 99%

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Spin and orbital disordering by hole doping inPr1−xCaxVO3<

et al. 2016

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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.

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Section: A Structural and Magnetic Phase Transitionsmentioning

confidence: 66%

Section: B Influence Of Ca Doping On the Crystal Structurementioning

confidence: 69%

Section: A Structural and Magnetic Phase Transitionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spin and orbital disordering by hole doping inPr1−xCaxVO3<

et al. 2016

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“…The orientation of the V spins within the C-SO phase has not been reported for all members of the series and its dependence on the rare earth is still rather unclear. 18 Available evidence provided by magnetization and neutron-diffraction measurements suggests that the V spins lie in the bc plane for RVO 3 with small rare earths 17,19 and in the ab plane for larger rare earths 16,20 but it should be noted that the ab-plane configuration is forbidden by symmetry arguments. 16,17 These two regions of the magnetic RVO 3 phase diagram coincide approximately with those defined by the G-OO phase monoclinic angle.…”

Section: A Critical Phenomenamentioning

confidence: 99%

Critical phenomena and femtosecond ordering dynamics associated with electronic and spin-ordered phases inYVO3andGdVO3

et al. 2010

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Critical phenomena and femtosecond ordering dynamics associated with electronic and spinordered phases in YVO3 and GdVO3 Yusupov, R. V.; Mihailovic, D.; Colin, C. V.; Blake, G. R.; Palstra, T. T. M. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. We present a systematic study of the electronic-and spin-excitation dynamics associated with the sequence of spin-and orbital-ordering phase transformations in the complex vanadates YVO 3 and GdVO 3 with ultrafast optical pump-probe reflectance spectroscopy. Relaxation dynamics occurs on a different time scale for each of the ordering transitions, which enables us to unambiguously associate the critical behavior in the dynamics with the observed ordering phenomena. Spin-ordering dynamics is observed on two time scales: r Ӎ 2 ps ͑rise time͒ and s Ӎ 300-3000 ps ͑decay time͒, observed below T N in both compounds. In contrast, the relaxation dynamics associated with orbital ordering occurs in YVO 3 on a time scale of o Ӎ 20-50 ps. From the temperature dependence of the dynamics, we observe that in both the G-type and C-type orbitally ordered ͑OO͒ phases of YVO 3 spin order develops in a second-order mean-field fashion with the Nèel temperature of the C-OO phase found from our data T N C =83Ϯ 7 K. In GdVO 3 we identify the emergence of a new ordered phase within the phase-separated state below 60 K. A new response component with a lifetime of ϳ60 ps is observed below 60 K together with other anomalies in the ⌬R / R͑⌬t͒ data. This new phase is not resolved in x-ray diffraction and is not present in YVO 3 .

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A New Class of Homogeneous Visible‐Light Photocatalysts: Molecular Cerium Vanadium Oxide Clusters

Seliverstov

Streb

2014

Chemistry A European J

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The first systematic access to molecular cerium vanadium oxides is presented. A family of structurally related, di-cerium-functionalized vanadium oxide clusters and their use as visible-light-driven photooxidation catalysts is reported. Comparative analyses show that photocatalytic activity is controlled by the cluster architecture. Increased photoreactivity of the cerium vanadium oxides in the visible range compared with nonfunctionalized vanadates is observed. Based on the recent discovery of the first molecular cerium vanadate cluster, (nBu4 N)2 [(Ce(dmso)3 )2 V12 O33 Cl]⋅2 DMSO (1), two new di-cerium-containing vanadium oxide clusters [(Ce(dmso)4 )2 V11 O30 Cl]⋅DMSO (2) and [(Ce(nmp)4 )2 V12 O32 Cl]⋅NMP⋅Me2 CO (3; NMP=N-methyl-2-pyrrolidone) were obtained by using a novel fragmentation and reassembly route. Pentagonal building units {(V)M5 } (M=V, Ce) reminiscent of "Müller-type" pentagons are observed in 2 and 3. Compounds 1-3 feature high visible-light photooxidative activity, and quantum efficiencies >10 % for indigo photooxidation are observed. Photocatalytic performance increases in the order 1<3<2. Mechanistic studies show that the irradiation wavelength and the presence of oxygen strongly affect photoreactivity. Initial findings suggest that the photooxidation mechanism proceeds by intermediate formation of hydroxyl radicals. The findings open new avenues for the bottom-up design of sunlight-driven photocatalysts.

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Crystal and magnetic structure of CeVO3

Cited by 49 publications

References 24 publications

Spin and orbital disordering by hole doping inPr1−xCaxVO3<

Spin and orbital disordering by hole doping inPr1−xCaxVO3<

Critical phenomena and femtosecond ordering dynamics associated with electronic and spin-ordered phases inYVO3andGdVO3

A New Class of Homogeneous Visible‐Light Photocatalysts: Molecular Cerium Vanadium Oxide Clusters

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