Structural Aspects of the Crystallographic-Magnetic Transition in LaVO3 around 140 K

Bordet, Pierre; Chaillout, C.; Marezio, M.; Huang, Q.; Santoro, A.; Cheong, Sang‐Wook; Takagi, H.; Oglesby, C. S.; Batlogg, B.

doi:10.1006/jssc.1993.1285

Cited by 181 publications

(190 citation statements)

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“…The high-quality of the artificially induced cation order is evidenced by the numerous observed satellite peaks (inset Fig. 1 No kinks, which signal the occurrence of a first-order structural phase transition from orthorhombic to monoclinic form, 15,19 are visible in the resistivity plots of the (LaVO 3 ) 6m (SrVO 3 ) m superlattice samples. Suppression of this structural phase transformation for thin film samples of the solid solution La 1-x Sr x VO 3 has been reported previously.…”

mentioning

confidence: 95%

Effect of charge modulation in (LaVO3)m(SrVO3)n superlattices on the insulator-metal transition

Sheets

Mercey

Prellier

2007

Applied Physics Letters

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A series of epitaxial (LaVO 3 ) 6m (SrVO 3 ) m superlattices having the same nominal composition as La 6/7 Sr 1/7 VO 3 , a Mott-Hubbard insulator, were grown with pulsed-laser deposition on [001]-oriented SrTiO 3 substrates, and their superlattice period was varied.When m = 1, the insulating resistivity of bulk-like La 6/7 Sr 1/7 VO 3 is obtained; however, an increase in the periodicity (m ≥ 2) results in metallic samples. Comparison of the superlattice periodicity with the coherence length of charge carriers in perovskite oxide heterostructures are used to understand these observations. A filling-controlled insulator-metal transition was induced by placing a single dopant layer of SrVO 3 within LaVO 3 layers of varying thickness.

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confidence: 95%

Effect of charge modulation in (LaVO3)m(SrVO3)n superlattices on the insulator-metal transition

Sheets

Mercey

Prellier

2007

Applied Physics Letters

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“…14 for YVO 3 (T=65 K and 100 K, for the orthorhombic and monoclinic phase, respectively), and in Ref. 18 for LaVO 3 (T=10 K).…”

Section: Crystal and Magnetic Structuresmentioning

confidence: 99%

Lattice distortion and magnetism of3d−t2gperovskite oxides

Solovyev

2006

Phys. Rev. B

150

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Several puzzling aspects of interplay of the experimental lattice distortion and the the magnetic properties of four narrow t2g-band perovskite oxides (YTiO3, LaTiO3, YVO3, and LaVO3) are clarified using results of first-principles electronic structure calculations. First, we derive parameters of the effective Hubbard-type Hamiltonian for the isolated t2g bands using newly developed downfolding method for the kinetic-energy part and a hybrid approach, based on the combination of the random-phase approximation and the constraint local-density approximation, for the screened Coulomb interaction part. Apart form the above-mentioned approximation, the procedure of constructing the model Hamiltonian is totally parameter-free. The results are discussed in terms of the Wannier functions localized around transition-metal sites. The obtained Hamiltonian was solved using a number of techniques, including the mean-field Hartree-Fock (HF) approximation, the second-order perturbation theory for the correlation energy, and a variational superexchange theory, which takes into account the multiplet structure of the atomic states. We argue that the crystal distortion has a profound effect not only on the values of the crystal-field (CF) splitting, but also on the behavior of transfer integrals and even the screened Coulomb interactions. Even though the CF splitting is not particularly large to quench the orbital degrees of freedom, the crystal distortion imposes a severe constraint on the form of the possible orbital states, which favor the formation of the experimentally observed magnetic structures in YTiO3, YVO3, and LaVO3 even at the level of mean-field HF approximation. It is remarkable that for all three compounds, the main results of all-electron calculations can be successfully reproduced in our minimal model derived for the isolated t2g bands. We confirm that such an agreement is only possible when the nonsphericity of the Madelung potential is explicitly included into the model. Beyond the HF approximation, the correlations effects systematically improve the agreement with the experimental data. Using the same type of approximations we could not reproduce the correct magnetic ground state of LaTiO3. However, we expect that the situation may change by systematically improving the level of approximations for dealing with the correlation effects.

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“…In bulk, SVO crystallizes in the ideal cubic perovskite structure, 14 while LVO crystallizes in a lower symmetry P nma structure derived from the cubic perovskite via a four unit-cell pattern of octahedral tilts. 15 The crystal structure of bulk solid solutions La 1−x Sr x VO 3 interpolates between that of the two end-members with the rotation amplitude decreasing as x increases. In the superlattice, the presence of a substrate and the breaking of translation symmetry can lead to different rotational distortions of the basic perovskite structure and also to a difference between lattice constants parallel and perpendicular to the growth direction.…”

Section: B Geometrical Structurementioning

confidence: 99%

“…15 The difference in lattice constants arises from a difference in tilting pattern. Superlattices are typically grown on a substrate, and in epitaxial growth conditions the lattice constants perpendicular to the growth direction (which we denote here by a) are fixed by the substrate, while the lattice parameter along the growth direction (c) is free to relax.…”

Section: B Geometrical Structurementioning

confidence: 99%

Designing ferromagnetism in vanadium oxide based superlattices

Dang

Millis

2013

Phys. Rev. B

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Motivated by recent reports (Phys. Rev. B80, 241102) of room-temperature ferromagnetism in vanadium-oxide based superlattices, a single-site dynamical mean field study of the dependence of the paramagnetic-ferromagnetic phase boundary on superlattice geometry was performed. An examination of variants of the experimentally determined crystal structure indicate that ferromagnetism is found only in a small and probably inaccessible region of the phase diagram. Design criteria for increasing the range over which ferromagnetism might exist are proposed.

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Structural Aspects of the Crystallographic-Magnetic Transition in LaVO3 around 140 K

Cited by 181 publications

References 0 publications

Effect of charge modulation in (LaVO3)m(SrVO3)n superlattices on the insulator-metal transition

Effect of charge modulation in (LaVO3)m(SrVO3)n superlattices on the insulator-metal transition

Lattice distortion and magnetism of3d−t2gperovskite oxides

Designing ferromagnetism in vanadium oxide based superlattices

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