Low dimensional magnetism in MnNb2−xVxO6

Hneda, Marlon Luiz; Cunha, J.B.M. da; Gusmao, Miguel Angelo Cavalheiro; Isnard, O.

doi:10.1016/j.materresbull.2015.10.030

Cited by 4 publications

(5 citation statements)

References 22 publications

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“…It is worth remarking that the relevance of the lattice structure is confirmed by the very similar magnetic properties of the columbite MnV 2 O 6 and the isostructural MnNb 2 O 6 , with only small quantitative differences that may be explained by different unit-cell parameters. However, even though the transition temperatures are almost coincident, the intrachain ordering is not the same, with the Nb compound showing a simple alternating sequence "+ − +−" [8]. (14.6.91) nonstandard setting related to the basis of the paramagnetic group P bcn1 .…”

Section: Discussionmentioning

confidence: 98%

“…Such a magnetic structure has yet to be reported in any other columbite compound. In particular, it differs from that of MnNb 2 O 6 , which exhibits antiferromagnetic (AF) zigzag chains forming a "+ − +−" spin sequence along the c axis [8]. of Mn 2+ is 3.76(5)μ B .…”

Section: Neutron Diffractionmentioning

confidence: 96%

“…It is characterized by magnetic A 2+ ions arranged in A-O layers (on the bc plane), separated by two nonmagnetic Nb 2+ planes along the a axis. This configuration contains weakly interacting magnetic chains [5][6][7][8], with the strongest exchange couplings occurring between A ions within each chain [8,9]. Such interesting low-dimensional magnetic properties are one of the main motivations for the present study.…”

Section: Introductionmentioning

confidence: 99%

“…For comparison, the magnetic transition of MnNb 2 O 6 occurs at 4.40 K [10][11][12]. We have recently reported [8] on a series of isostructural compounds MnNb 2−x V x O 6 , for x 0.4, i.e., in the stability range of the P bcn structure. All the compounds showed quasi-one-dimensional (1D) magnetic behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Structural parameters obtained at room temperature from a Rietveld refinement of the XRD pattern for MnV 2 O 6 compared to that of MnNb 2 O 6[8], both orthorhombic P bcn compounds.…”

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confidence: 99%

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Low-dimensional magnetic properties of orthorhombic MnV2O6 : A nonstandard structure stabilized at high pressure

et al. 2017

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This paper presents the physical properties of a nonstandard orthorhombic form of MnV 2 O 6 , including a comparison with the isostructural orthorhombic niobate MnNb 2 O 6 , and with the usual MnV 2 O 6 monoclinic polymorph. Orthorhombic (P bcn) MnV 2 O 6 is obtained under extreme conditions of high pressure (6.7 GPa) and high temperature (800 • C). A negative Curie-Weiss temperature θ CW is observed, implying dominant antiferromagnetic interactions at high temperatures, in contrast to the positive θ CW of the monoclinic form. Specific-heat measurements are reported down to 1.8 K for all three compounds, and corroborate the magnetic-transition temperatures obtained from susceptibility data. Orthorhombic MnV 2 O 6 presents a transition to an ordered antiferromagnetic state at T N = 4.7 K. Its magnetic structure, determined by neutron diffraction, is unique among the columbite compounds, being characterized by a commensurate propagation vector k = (0,0, 1 2). It presents antiferromagnetic chains running along the c axis, but with a different spin pattern in comparison to the chains observed in MnNb 2 O 6. By a comparative discussion of our observations in this three compounds, we are able to highlight the interplay between competing interactions and dimensionality that yield their magnetic properties.

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Section: Discussionmentioning

confidence: 98%

Section: Neutron Diffractionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Structural parameters obtained at room temperature from a Rietveld refinement of the XRD pattern for MnV 2 O 6 compared to that of MnNb 2 O 6[8], both orthorhombic P bcn compounds.…”

mentioning

confidence: 99%

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