Rb-substitution effect on the metal-insulator transition of hollandite vanadate, K2V8O16

Isobe, Masahiko; Koishi, Shigenori; Ueda, Yutaka

doi:10.1088/1742-6596/121/3/032007

Cited by 2 publications

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References 5 publications

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“…In order to elucidate the difference in transition between 17) At room temperature, the a-axis extends and the c-axis is almost constant with increasing Rb content, resulting in an increase in volume. Since we have not yet succeeded in growing single crystals with sufficient size to measure resistivity in the solid solution system, we measured the ðTÞ of powder samples to detect MI transition.…”

Section: Resultsmentioning

confidence: 99%

Substitution Effect on Metal–Insulator Transition of K₂V₈O₁₆

et al. 2009

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The effect of the substitution of various ions on the metal-insulator (MI) transition at 170 K in K 2 V 8 O 16 has been investigated. Both Rb and Ti form complete solid solution systems: K 2Àx Rb x V 8 O 16 and K 2 V 8Ày Ti y O 16 , respectively. The substitution of Rb for K or of Ti for V splits the transition into two transitions: the high-temperature transition is a first-order MI transition from a tetragonal structure to a tetragonal structure, and the low-temperature transition is a second-order transition to a monoclinic structure. In K 2Àx Rb x V 8 O 16 , the former terminates to an MI transition at around 220 K in Rb 2 V 8 O 16 , while the latter disappears at x > 0:6. In K 2 V 8Ày Ti y O 16 , both transitions disappear at y > 0:5. The substitution of Cr for V also results in a similar splitting of the transition and the rapid disappearance of both transitions. The substitution of Na or Ba for K suppresses the MI transition without any splitting of the transition, although the solubility of both ions is limited. These substitution effects reveal that the MI transition of K 2 V 8 O 16 consists of two parts: a first-order MI transition and a parasitic second-order structural transition; the substitution of some ions causes a clear splitting of these transitions, probably due to the difference between the chemical pressure effects on the two transitions. The first-order MI transition is very sensitive to charge randomness, suggesting the charge ordering nature of the MI transition, while the second-order structural transition is very sensitive to both charge and structural randomnesses.

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Section: Resultsmentioning

confidence: 99%

Substitution Effect on Metal–Insulator Transition of K₂V₈O₁₆

et al. 2009

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μ+SR study on ferromagnetic hollandite K2Cr8O
Sugiyama
¹
,
Nozaki
²
,
Må̊nsson
³

et al. 2012
Phys. Rev. B
29
3
20
1
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The magnetism of a quasi-one-dimensional ferromagnetic (FM) compound, K 2 Cr 8 O 16 , has been investigated by muon-spin rotation and relaxation (μ + SR) using a powder sample in the temperature range between 2 and 225 K. Below T c = 163 K, muon-spin precession signals were clearly observed in the zero-field spectrum, indicating the formation of static FM order. It was also found that the internal field does not change drastically at the metal-to-insulator transition temperature, T MI ∼ 100 K. Electrostatic potential calculations and dipole field calculations suggested that FM order is not parallel to the [100], [010], [001], and [110] directions but likely parallel to the [101], [011], and/or [111] directions. A very similar result was obtained for a related compound, Rb 2 Cr 8 O 16 , while itsT c is 254 K.

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Rb-substitution effect on the metal-insulator transition of hollandite vanadate, K₂V₈O₁₆

Cited by 2 publications

References 5 publications

Substitution Effect on Metal–Insulator Transition of K₂V₈O₁₆

Substitution Effect on Metal–Insulator Transition of K₂V₈O₁₆

μ+SR study on ferromagnetic hollandite K2Cr8O
Sugiyama
¹
,
Nozaki
²
,
Må̊nsson
³

et al. 2012
Phys. Rev. B
29
3
20
1
View full text Add to dashboard Cite

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Rb-substitution effect on the metal-insulator transition of hollandite vanadate, K2V8O16

Cited by 2 publications

References 5 publications

Substitution Effect on Metal–Insulator Transition of K2V8O16

Substitution Effect on Metal–Insulator Transition of K2V8O16

μ+SR study on ferromagnetic hollandite K2Cr8OSugiyama1, Nozaki2, Må̊nsson3 et al. 2012Phys. Rev. B293201View full textAdd to dashboardCite

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Rb-substitution effect on the metal-insulator transition of hollandite vanadate, K₂V₈O₁₆

Substitution Effect on Metal–Insulator Transition of K₂V₈O₁₆

Substitution Effect on Metal–Insulator Transition of K₂V₈O₁₆

μ+SR study on ferromagnetic hollandite K2Cr8O
Sugiyama
¹
,
Nozaki
²
,
Må̊nsson
³

et al. 2012
Phys. Rev. B
29
3
20
1
View full text Add to dashboard Cite