<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Co</mml:mi><mml:mo stretchy="false">[</mml:mo><mml:msub><mml:mi mathvariant="normal">V</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mo stretchy="false">]</mml:mo><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>: A Spinel Approaching the Itinerant Electron Limit

Kismarahardja, Ade; Brooks, J. S.; Kiswandhi, Andhika; Matsubayashi, K.; Yamanaka, R; Uwatoko, Yoshiya; Whalen, Jeffrey B.; Siegrist, T.; Zhou, H. D.

doi:10.1103/physrevlett.106.056602

Cited by 71 publications

(102 citation statements)

References 24 publications

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“…The structural transitions are often accompanied by an orbital order which then drives the magnetic order at low temperatures. However, unlike other vanadium spinels, CoV 2 O 4 is reported to have no structural transition as the temperature is lowered [9]. Two magnetic transitions are observed [15] in this system, one at 152 K from paramagnetic to collinear ferrimagnetic ordering between the Co and V spins, and the other at 59 K from collinear ferrimagnetic to non-collinear ferrimagnetic order.…”

Section: Introductionmentioning

confidence: 88%

“…The t 2g (e g ) orbitals have lower energy than e g (t 2g ) orbitals in octahedral (tetrahedral) field. The O 6 octahedra are not the ideal ones as the O-V-O angles deviate from 90 o in this structure [9,15]. This distorted octahedron causes a local trigonal distortion which further splits the triply degenerate t 2g orbitals of vanadium into an a 1g orbital and doubly degenerate e ′ g orbitals.…”

Section: Introductionmentioning

confidence: 99%

“…As far as the transport property is concerned, FeV 2 O 4 lies in between CoV 2 O 4 and MnV 2 O 4 . In Table 1 we have summarized the available data from literature for these AV 2 O 4 vanadates [3,4,5,7,9,10,11,12,13,14,15,16]. We note that as we go from A= Mn to Fe to Co, the d V −V decreases gradually and corresponding magnetic ordering temperature is found to increase.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Single crystal measurements [9] reveal that CoV 2 O 4 has the shortest d V −V and hence is the closest to the boundary between insulating and metallic regimes. Though this system is semiconducting at ambient pressure, with the application of pressure which reduces d V −V further, it crosses a critical value of d V −V and starts conducting [9]. However, the order of resistivities observed in the pressure induced "metallic" regime is much higher [9] in comparison to the typical resistivities observed in case of a good metal.…”

Section: Introductionmentioning

confidence: 99%

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The nature of itineracy in CoV₂O₄: a first-principles study

Kaur¹,

Maitra²,

Nautiyal³

2014

J. Phys.: Condens. Matter

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Abstract. Inspired by recent experiments, we have theoretically explored the nature of itineracy in CoV 2 O 4 under pressure and investigated, using first principles density functional theory calculations, if it has any magnetic and orbital ordering. Our calculations indicate that there could be two possible routes to obtain the experimentally observed pressure induced metallicity in this system. One is the spinorbit interaction coupled with Coulomb correlation which can take the system from a semiconducting state at ambient pressure to a metallic state under high pressure. The other mechanism, as indicated by our GGA+U calculations, is based on the presence of two types of electrons in the system: localized and itinerant. An effective FalicovKimball model could then possibly explain the observed insulator to metal transition. Comparison of the two scenarios with existing experimental observations leads us to believe that the second scenario offers a better explanation for the mechanism of insulator to metal transition in CoV 2 O 4 under pressure.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The nature of itineracy in CoV₂O₄: a first-principles study

Kaur¹,

Maitra²,

Nautiyal³

2014

J. Phys.: Condens. Matter

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Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

et al. 2021

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The manipulation of mesoscale domain wall phenomena has emerged as a powerful strategy for designing ferroelectric responses in functional devices, but its full potential is not yet realized in the field of magnetism. This work shows a direct connection between magnetic response functions in mechanically strained samples of Mn 3 O 4 and MnV 2 O 4 and stripe-like patternings of the bulk magnetization which appear below known magnetostructural transitions. Building off previous magnetic force microscopy data, a small-angle neutron scattering is used to show that these patterns represent distinctive magnetic phenomena which extend throughout the bulk of two separate materials, and further are controllable via applied magnetic field and mechanical stress. These results are unambiguously connected to the anomalously large magnetoelastic and magnetodielectric response functions reported for these materials, by performing susceptibility measurements on the same crystals and directly correlating local and macroscopic data.

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Transport, magnetic and structural properties of Mott insulator MnV2O4 at the boundary between localized and itinerant electron limit

et al. 2014

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The effect of Zn and Cr doping on the transport and magnetic properties of MnV 2 O 4 have been investigated using resistivity, thermoelectric power (TEP), magnetization, neutron diffraction and X-ray diffraction techniques. It is observed, that with increase in Zn substitution the noncollinear orientation of Mn spins with the V spins decreases which effectively leads to the decrease of structural transition temperature more rapidly than Curie temperature. Investigations also show that with Zn doping both the Curie temperature (T C ) and structural transition temperature (T S ) decrease, while the gap between them increases rapidly. On the other hand, with Cr doping on the V site the T C remains almost constant but T S decreases rapidly. Moreover, with Zn doping both resistivity and TEP decrease, whereas with 10 % Cr doping the TEP decreases and a change of sign occurs indicating an increase in the band gap. This leads to the decrease of the mobility of the polaronic holes than the mobility of the electronic polarons at low temperature.

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Co[V2]O4: A Spinel Approaching the Itinerant Electron Limit

Cited by 71 publications

References 24 publications

The nature of itineracy in CoV₂O₄: a first-principles study

The nature of itineracy in CoV₂O₄: a first-principles study

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

Transport, magnetic and structural properties of Mott insulator MnV2O4 at the boundary between localized and itinerant electron limit

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Co[V2]O4: A Spinel Approaching the Itinerant Electron Limit

Cited by 71 publications

References 24 publications

The nature of itineracy in CoV2O4: a first-principles study

The nature of itineracy in CoV2O4: a first-principles study

Domain Wall Patterning and Giant Response Functions in Ferrimagnetic Spinels

Transport, magnetic and structural properties of Mott insulator MnV2O4 at the boundary between localized and itinerant electron limit

Contact Info

Product

Resources

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The nature of itineracy in CoV₂O₄: a first-principles study

The nature of itineracy in CoV₂O₄: a first-principles study