Low-energy excitations in the random magnetic chain system MgTiBO4

Brunner, Molly; Tholence, J. L.; Puech, L.; Haan, S. de; Capponi, J.J.; Calemczuk, R.; Fernandes, J. C.; Continentino, M. A.

doi:10.1016/s0921-4526(96)00846-0

Cited by 13 publications

(17 citation statements)

References 13 publications

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“…Table II gives the transition temperatures T sg for a frequency of ϭ125 Hz. Notice that for MgCrOBO 3 and MgFeOBO 3 the susceptibility continues to rise below T sg . 9 Mössbauer spectroscopy ͑MS͒ measurements were per- Figs.…”

Section: Resultsmentioning

confidence: 95%

“…3 is that for MgFeOBO 3 and MgCrOBO 3 the susceptibility continues to rise below the transition temperature. This indicates that not all magnetic degrees of freedom are blocked at T sg .…”

Section: Fig 4 (Continued)mentioning

confidence: 93%

“…3 In this case the contribution for the specific heat from the low-energy magnetic excitations associated with the random singlet phase of REHAC's could be directly observed. These excitations give rise to a characteristic temperature dependence of the specific heat C p ϰT 1Ϫ␣ where ␣ is the same exponent describing the divergence of the low-temperature susceptibility, ϰT Ϫ␣ .…”

Section: Introductionmentioning

confidence: 91%

“…6͒ are generally valid for the warwickites, then for ScNiOBO 3 and ScMnOBO 3 most of the divalent magnetic cations are in the outer columns and at a distance d 3 apart.…”

Section: Fig 4 (Continued)mentioning

confidence: 98%

“…[1][2][3][4][5] These systems are mixed borates with general formula M 2ϩ M 3ϩ OBO 3 which have linear structures in the form of ribbons extending along the c axis ͑see Fig. 1͒.…”

Section: Introductionmentioning

confidence: 99%

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Dimensional crossover in magnetic warwickites

et al. 1997

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We present an investigation of the magnetic properties of a series of warwickites with different transition metals. These materials are characterized by one-dimensional structures called ribbons where the transition metals are randomly located. The present results allow for a systematic investigation of the hierarchy of magnetic interactions in these systems. While the intraribbon interactions are mainly direct d-d interactions between the transition-metal ions, the interribbon interaction is due to superexchange between metals in different octahedra mediated by the oxygen in the common corner. ͓S0163-1829͑97͒00625-5͔

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Section: Resultsmentioning

confidence: 95%

“…3 is that for MgFeOBO 3 and MgCrOBO 3 the susceptibility continues to rise below the transition temperature. This indicates that not all magnetic degrees of freedom are blocked at T sg .…”

Section: Fig 4 (Continued)mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 91%

“…6͒ are generally valid for the warwickites, then for ScNiOBO 3 and ScMnOBO 3 most of the divalent magnetic cations are in the outer columns and at a distance d 3 apart.…”

Section: Fig 4 (Continued)mentioning

confidence: 98%

“…[1][2][3][4][5] These systems are mixed borates with general formula M 2ϩ M 3ϩ OBO 3 which have linear structures in the form of ribbons extending along the c axis ͑see Fig. 1͒.…”

Section: Introductionmentioning

confidence: 99%

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Dimensional crossover in magnetic warwickites

et al. 1997

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Crystal and local atomic structure of MgFeBO₄ , Mg_0.5 Co_0.5 FeBO₄ and CoFeBO₄ : Effects of Co substitution

Kazak

Платунов

Knyazev

et al. 2015

Phys. Status Solidi B

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Single‐crystalline MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4 have been grown by the flux method. The samples have been characterized by X‐ray spectral analysis, X‐ray diffraction, and X‐ray absorption spectroscopy. The X‐ray absorption near‐edge structure (XANES) and extended X‐ray absorption fine structure (EXAFS) spectra have been measured at the Fe and Co K‐edges over a wide temperature range (6.5–300 K). The composition, the charge state, and local environment of both Fe and Co atoms have been determined. The effects of Co substitution for Mg on the local structural distortions have been revealed experimentally and the MO bond anisotropy has been found.

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One‐electron approach to describe charge and orbital order in Mn₂OBO₃

Matos

Oliveira

2006

Int J of Quantum Chemistry

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A detailed study is performed on the band structure of the mixed-valent Mn 2 OBO 3 warwickite, by using the high-spin filling (hsf) scheme in the extended Hückel approach. It is found that charge ordering, found experimentally to be adopted by the compound, is associated with orbital order, represented by the presence of x 2 − y 2 holes in Mn1. The hsf scheme provides considerable improvement in the calculation of charge distribution in the material, as compared with the usual band filling scheme, with both Mn1 and Mn2 cations exhibiting positive charge. In addition, the octahedral distortion around Mn1 is correctly described as a Jahn-Teller (JT) type-distortion. The calculated electronic band structure provides evidence that the Mn warwickite is an insulator, in agreement with experimental data. O1, connected to the JT-like distortion of Mn1, is found to be loosely bound to the structure, as compared with other O-atoms in the lattice, showing a favorable condition in the structural stability of the compound. Comparison is made with the mixed-valent Fe 2 OBO 3 warwickite.

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Low-energy excitations in the random magnetic chain system MgTiBO4

Cited by 13 publications

References 13 publications

Dimensional crossover in magnetic warwickites

Dimensional crossover in magnetic warwickites

Crystal and local atomic structure of MgFeBO₄ , Mg_0.5 Co_0.5 FeBO₄ and CoFeBO₄ : Effects of Co substitution

One‐electron approach to describe charge and orbital order in Mn₂OBO₃

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Low-energy excitations in the random magnetic chain system MgTiBO4

Cited by 13 publications

References 13 publications

Dimensional crossover in magnetic warwickites

Dimensional crossover in magnetic warwickites

Crystal and local atomic structure of MgFeBO4 , Mg0.5 Co0.5 FeBO4 and CoFeBO4 : Effects of Co substitution

One‐electron approach to describe charge and orbital order in Mn2OBO3

Contact Info

Product

Resources

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Crystal and local atomic structure of MgFeBO₄ , Mg_0.5 Co_0.5 FeBO₄ and CoFeBO₄ : Effects of Co substitution

One‐electron approach to describe charge and orbital order in Mn₂OBO₃