Neutron diffraction study, magnetism and magnetotransport of stoichiometric CaVO3 perovskite with positive magnetoresistance

Falcón, Horacio; Alonso, José Antonio; Casáis, M. T.; Martı́nez-Lope, M. J.; Sánchez-Benítez, Javier

doi:10.1016/j.jssc.2004.05.010

Cited by 55 publications

(52 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental lattice parameters of 3.84Å was used for cubic SrVO 3 22 and a = 5.32Å, b = 5.34Å and c = 7.55Å were used for orthorhombic CaVO 3 . 25 Convergence was achieved over a 13 × 13 × 13 mesh in the full Brillouin zone.…”

Section: Methodsmentioning

confidence: 99%

Enhanced electron correlations at theSrxCa1−xVO3surface

et al. 2015

View full text Add to dashboard Cite

We report hard x-ray photoemission spectroscopy measurements of the electronic structure of the prototypical correlated oxide SrxCa1−xVO3. By comparing spectra recorded at different excitation energies, we show that 2.2 keV photoelectrons contain a substantial surface component, whereas 4.2 keV photoelectrons originate essentially from the bulk of the sample. Bulk sensitive measurements of the O 2p valence band are found to be in good agreement with ab initio calculations of the electronic structure with some modest adjustments to the orbital-dependent photoionization cross-sections. The evolution of the O 2p electronic structure as a function of the Sr content is dominated by A-site hybridization. Near the Fermi level, the correlated V 3d Hubbard bands are found to evolve in both binding energy and spectral weight as a function of distance from the vacuum interface, revealing higher correlation at the surface than in the bulk.

show abstract

Section: Methodsmentioning

confidence: 99%

Enhanced electron correlations at theSrxCa1−xVO3surface

et al. 2015

View full text Add to dashboard Cite

show abstract

“…The ratio is also compared to that in isostructural CaVO 3 and CaTiO 3 . 12, 13 The structural study on CaTiO 3…”

Section: Neutron Diffraction Under High Pressurementioning

confidence: 99%

Identification of electronic state in perovskiteCaCrO3by high-pressure studies

et al. 2015

View full text Add to dashboard Cite

CaCrO 3 is at the crossover from localized to itinerant electronic behavior, and interpretation of its electronic state has remained controversial. It is a metal from an optical study. However, the collinear type-C antiferromagnetic spin ordering below T N ≈ 90 K is characteristic of localized electron magnetism. We have performed many runs of high-pressure synthesis. CaCrO 3 crystals can be found in some batches. We have used specific-heat measurement as a diagnostic tool to probe the electronic states near the Fermi energy. An electronic bandwidth is broadened by applying high pressure. The magnetization measurement under pressure reveals a dT N /dP < 0.The crystal structural change corresponding to the pressure-induced electron structural change has been monitored by in-situ neutron diffraction under high pressure. The d-electron configuration on octahedral site Cr 4+ is orbitally threefold degenerate. Local site distortions are argued to show that in CaCrO 3 the crossover from localized to itinerant 3d electrons does not result in a charge-density wave in which segregation of the interatomic interactions results in the stabilization of molecular clusters, but in an intraatomic orbital ordering that stabilizes a halffilled localized-electron xy orbital and a ¼-filled c-axis π* band. Local structural changes under pressure reveal a weakening of long-range magnetic order is associated with a smooth MottHubbard transition of the xy electrons.2

show abstract

“…Polycrystalline CaVO 3 and SrVO 3 were synthesized by the citrate precursor method adopted from H. Falcon et al (Falcon, 2004 (Jayaraman, 1986) with diamonds 400μm diameter culet. Typical exposure times for xray diffraction collection were in the range between 5 to 30 min.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Materials with distorted perovskite structures exhibit colossal magnetoresistance; they have been considered as potential materials for holographic data storage. Both CaVO 3 and SrVO 3 are strongly correlated metals which have been used as study cases to understand electronic correlation in solids (Odier et al, 1995;Ueda, 1998;Falcon, 2004;Nekrasov et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Depending on tilting and compressibility of the B-O octahedra perovskites can undergo phase transitions either from higher to lower or from lower to higher symmetries with changing pressures and temperature. Under ambient pressure, SrVO 3 and CaVO 3 were known to crystalize in Pm-3m and Pbnm respectively (Falcon, 2004;Maekawa et al, 2006). These perovskites have not been previously studied under high pressure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Exploring Thermal and Mechanical Properties of Selected Transition Elements under Extreme Conditions: Experiments at High Pressures and High Temperatures

Hrubiak¹

View full text Add to dashboard Cite

Neutron diffraction study, magnetism and magnetotransport of stoichiometric CaVO3 perovskite with positive magnetoresistance

Cited by 55 publications

References 21 publications

Enhanced electron correlations at theSrxCa1−xVO3surface

Enhanced electron correlations at theSrxCa1−xVO3surface

Identification of electronic state in perovskiteCaCrO3by high-pressure studies

Exploring Thermal and Mechanical Properties of Selected Transition Elements under Extreme Conditions: Experiments at High Pressures and High Temperatures

Contact Info

Product

Resources

About