Effect of Iron Substitution on the Structural, Electric, and Magnetic Properties inR-Type PbFexV6−xO11, a Frustrated System

Mentré, Olivier; Dhaussy, Anne-Claire; Abraham, Francis; Steinfink, H.

doi:10.1006/jssc.1997.7294

Cited by 12 publications

(12 citation statements)

References 25 publications

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“…Synchrotron x-ray diffraction data (Fig. 1(a)), collected from polycrystalline powder at both room temperature and 15 K, ensures pure single phase of the sample without any structural phase transition down to the lowest measured temperature, and consequently, satisfactory structural refinement has been performed by considering a non-centrosymmetric hexagonal P6 3 mc space group, which is consistent with the previous literature 25,26 . The refined structural parameters including lattice constants, atomic positions, site occupancy, along with the goodness factors are listed in Table-S1.…”

Section: Resultssupporting

confidence: 82%

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Saha

Bandyopadhyay²,

Schiesaro³

et al. 2021

Phys. Rev. B

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Colossal electroresistance (CER) in manganites, i.e., a large change in electrical resistance under the influence of either an applied electric field or an applied electric current, has often been described as complimentary to the colossal magnetoresistance (CMR) effect. Mixed valent vanadates with active t 2g and empty e g orbitals, unlike manganites, have not naturally been discussed in this context, as double exchange based CMR is not realizable in them. However, presence of coupled spin and orbital degrees of freedom, metal-insulator transition (MIT) accompanied by orbital order-disorder transition, etc., anyway make the vanadates an exciting group of materials. Here we probe a Fe-doped hollandite lead vanadate PbFe 1.75 V 4.25 O 11 (PFVO), which exhibits a clear MIT as a function of temperature. Most importantly, a giant fall in the resistivity, indicative of a CER, as well as a systematic shift in the MIT towards higher temperature are observed as a function of applied electric current. Detailed structural, magnetic, thermodynamic and transport studies point towards a complex interplay between orbital order/disorder effect, MIT and double exchange in this system.

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Section: Resultssupporting

confidence: 82%

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Saha

Bandyopadhyay²,

Schiesaro³

et al. 2021

Phys. Rev. B

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“…Figure 4 shows the obtained susceptibility versus ¹ for ZFC/FC cycle measured at 1000 Gauss for x"1.75. The broadness of the peak and crystallographic considerations strongly suggest a freezing phenomenon (7). It is well established that the two essential microscopic ingredients of a spin glass are site disorder and bond frustration (23,24) which comforts the observed magnetic behavior because of the existing KagomeH sublattice parallel to the (a, b) plane formed by the V (1) Fig.…”

Section: Magnetic Featuresmentioning

confidence: 88%

“…The most outstanding feature is the already observed o!-centering of Pb> within its cuboctahedron cage related to the P6 mc space group (1,7). This e!ect remains constant in the (3) Figure 2 shows the crystal structure and iron occupancies n the whole unit cell.…”

Section: Rietveld Rexnementmentioning

confidence: 92%

“…A later study permitted the preparation of single phase lead}vanadium R-block oxide by the partial substitution of Fe> for V>, leading to the PbFe V V \V O series, 14x41.75. Several other cations (Ti>, Cr>, Sn>) were also tested but appear to lead preferentially to hollandite-like compounds (7). Fe> substituted compounds conserve the structural characteristics of PbV O as con"rmed by the structural re"nement of PbFe V O by single crystal X-ray di!raction and so allow the investigation of the PbV O analog physical properties (electric and magnetic) (7).…”

Section: Introductionmentioning

confidence: 99%

“…Several other cations (Ti>, Cr>, Sn>) were also tested but appear to lead preferentially to hollandite-like compounds (7). Fe> substituted compounds conserve the structural characteristics of PbV O as con"rmed by the structural re"nement of PbFe V O by single crystal X-ray di!raction and so allow the investigation of the PbV O analog physical properties (electric and magnetic) (7). Correlations between magnetic and electric properties were indicated by a spinfrustrated/insulatorPparamagnetic/semiconductor transition.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Site Preference of Fe and V in PbFexV6−xO11 by Neutron Diffraction and Mössbauer Spectroscopy: Low Temperature Investigation for x=1.75

Dhaussy

Mentré

Abraham

et al. 1999

Journal of Solid State Chemistry

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Preferred orientation in polycrystalline colossal electroresistive hollandite PbFe_xV_6‐_xO₁₁

Halder

Ray

2022

Int J Ceramic Engine & Sci

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Preferred orientation in polycrystalline materials is one of the most challenging problems for structural analysis. Significant preferred orientation can severely affect the structure-property analysis of the systems having substantial crystallographic anisotropy. Here, an extremely high degree of preferred orientation has been demonstrated in R-block hollandite hexagonal PbFe x V 6−x O 11 compounds, which has recently been shown to exhibit an unusual colossal electroresistance response that has a strong dependence on structural modifications. The present results warn against possible errors in understanding the evolution of the crystal structure of these hollandites, which might adversely affect the estimation of the influence of the same on their spectacular physical properties.

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Effect of Iron Substitution on the Structural, Electric, and Magnetic Properties inR-Type PbFexV6−xO11, a Frustrated System

Cited by 12 publications

References 25 publications

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Site Preference of Fe and V in PbFexV6−xO11 by Neutron Diffraction and Mössbauer Spectroscopy: Low Temperature Investigation for x=1.75

Preferred orientation in polycrystalline colossal electroresistive hollandite PbFe_xV_6‐_xO₁₁

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Effect of Iron Substitution on the Structural, Electric, and Magnetic Properties inR-Type PbFexV6−xO11, a Frustrated System

Cited by 12 publications

References 25 publications

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Colossal electroresistance response accompanied by metal-insulator transition in a mixed-valent vanadate

Site Preference of Fe and V in PbFexV6−xO11 by Neutron Diffraction and Mössbauer Spectroscopy: Low Temperature Investigation for x=1.75

Preferred orientation in polycrystalline colossal electroresistive hollandite PbFexV6‐xO11

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Preferred orientation in polycrystalline colossal electroresistive hollandite PbFe_xV_6‐_xO₁₁