Effect of the diamagnetic dilution on the magnetic ordering and electrical conductivity in the Co3O2BO3: Ga ludwigite

Ivanovа, Natalia; Платунов, М. С.; Knyazev, Yu. V.; Kazak, N. V.; Безматерных, Л. Н.; Vasiliev, A. D.; Овчинников, С. Г.; Nizhankovskii, V. I.

doi:10.1134/s1063783412110133

Cited by 20 publications

(21 citation statements)

References 21 publications

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“…However, in some cases, this question remains open. By substituting cobalt ion by gallium ions, gallium ions occupy preferably position 4, and to some extent position 2 . On the magnetization curves in ZFC mode (figure ) in a very weak field, a rise is visible in the 37 K area, such behavior is somewhat different from the rest ludwigites in which after lifting in the transition area a magnetization reduces in ZFC mode.…”

Section: Heterometallic Ludwigitesmentioning

confidence: 96%

“…The general chemical formula is Me +3 Mе +2 2 BO 5 . Metal ions can be present as one ion with a different valence (homometallic) , and various ions (heterometallic) . Metal ions (bivalent ‐ Mg, Ni, Zn, Co, Fe, trivalent ‐ Al, V, Cr, Mn, Fe, Ga, Co, tetravalent ‐ Mn, Sn, Ge, Zr, Ti, and even pentavalent ‐ Sb, Nb) are located in the center of the oxygen octahedral coordination with common edges.…”

Section: Crystal Structurementioning

confidence: 99%

“…Currently several solid solutions based on Co 3 BO 5 were received and investigated. Substitution of Co was produced by magnetic ions of Mn, Cu and non‐magnetic ‐ Ga, Ti, Mg, Sn .…”

Section: Heterometallic Ludwigitesmentioning

confidence: 99%

“…The field is directed along the crystallographic a axis. The inset shows the temperature dependence of the inverse magnetic susceptibility, corresponding to the M ( H ) curve, measured in a field H = 5 T. The straight line is the approximation of the Curie‐Weiss .…”

Section: Heterometallic Ludwigitesmentioning

confidence: 99%

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Ludwigites: From natural mineral to modern solid solutions

Софронова

Назаренко

2017

Crystal Research and Technology

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Ludwigites is a type of oxyborates compounds with BO 3 groups, which have low-dimensional elements: stairs, zigzag walls, tapes. Such structural features influence on the physical properties of the compounds and cause charge ordering, the existence of two magnetic subsystems, ordered at different temperatures in the perpendicular direction, the quasi-one-dimensional magnetism, spin-glass state. In this survey, we have summarized all known experimental and theoretical studies and analyzed the proposed by the authors mechanisms of phase transitions in the ludwigite structure oxyborates.

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Section: Heterometallic Ludwigitesmentioning

confidence: 96%

Section: Crystal Structurementioning

confidence: 99%

“…Currently several solid solutions based on Co 3 BO 5 were received and investigated. Substitution of Co was produced by magnetic ions of Mn, Cu and non‐magnetic ‐ Ga, Ti, Mg, Sn .…”

Section: Heterometallic Ludwigitesmentioning

confidence: 99%

Section: Heterometallic Ludwigitesmentioning

confidence: 99%

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Ludwigites: From natural mineral to modern solid solutions

Софронова

Назаренко

2017

Crystal Research and Technology

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“…[7][8][9] The other type comprises of systems in which M is non-magnetic (for instance, Ga, Al, Mg, or Ti), and the resultant dilution of the magnetic lattice typically manifests itself in the form of a reduced transition temperature. [10][11][12][13] Since the M ions has four in-equivalent crystallographic sites within the Ludwigite structure, the eventual properties are likely to be crucially influenced by the occupancies of the different M and M species within these sites. In some Ludwigites, this is also reported to give rise to a low temperature spin glass like state without long range order.…”

Section: Introductionmentioning

confidence: 99%

Reentrant superspin glass state and magnetization steps in the oxyborate Co2AlBO5

et al. 2017

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An oxyborate Co2AlBO5 belonging to the ludwigite family is investigated using structural, thermodynamic, dielectric and magnetic measurements. Magnetic measurements indicate that this system is seen to exhibit long range magnetic ordering at T N = 42 K, signatures of which are also seen in the specific heat, dielectric susceptibility, and the lattice parameters. The absence of a structural phase transition down to the lowest measured temperatures, distinguishes it from the more extensively investigated Fe-based ludwigites. At low temperatures, the system is seen to stabilize in a reentrant superspin glass phase at T G = 10.6 K from within the magnetically ordered state. This ground state is also characterized by magnetic field induced metamagnetic transitions, which at the lowest measured temperatures exhibit a number of sharp magnetization steps, reminiscent of that observed in the mixed valent manganites.

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Low Lying Magnetic States of the Mixed Valence Cobalt Ludwigite

Matos

Terra

Ellis

2019

Physica Status Solidi (b)

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There are two interpretations offered for the different structural and magnetic properties of the mixed valence homo-metallic ludwigites, Co 3 O 2 BO 3 and Fe 3 O 2 BO 3 . One of them associates the physical behavior to charge ordering processes among the cations, as is well known in simpler oxides. The other attributes the effects to local pairwise magnetic interactions. Recently first principles calculations in the iron ludwigite have shown that the structural cation dimerization is due to the formation of strong magnetic dyads supporting the second model. Here we confirm the dominance of magnetic interactions to explain the absence of dimerization in the cobalt compound. Density functional noncollinear spin calculations are carried out on Co 3 O 2 BO 3 to determine its low temperature magnetic order. Low spin is found on tri-valent cobalt sites, thus preventing the formation of the ferromagnetic dyad, the mechanism which favors dimerization in Fe 3 O 2 BO 3 . We conclude that the difference between high spin Fe 3+ and low spin Co 3+ pairwise interactions is responsible for the observed differences between the two compounds. The pairwise magnetic interactions also explain the difference between the existence of low temperature bulk AF state in the Fe ludwigite and its absence in the Co material.

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Effect of the diamagnetic dilution on the magnetic ordering and electrical conductivity in the Co3O2BO3: Ga ludwigite

Cited by 20 publications

References 21 publications

Ludwigites: From natural mineral to modern solid solutions

Ludwigites: From natural mineral to modern solid solutions

Reentrant superspin glass state and magnetization steps in the oxyborate Co2AlBO5

Low Lying Magnetic States of the Mixed Valence Cobalt Ludwigite

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