LiV&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;: A heavy fermion transition metal oxide

Kondo, Shin‐ichiro

doi:10.2172/348928

Cited by 12 publications

(17 citation statements)

References 57 publications

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“…These examples demonstrate that exercising careful control of synthesis procedures to produce ultra-clean samples with low disorder may be extremely important when searching for superconductivity in some heavy-fermion compounds. It may also be rewarding to expand the search for superconductivity into relatively unexplored potential reservoirs of heavy-fermion compounds such as among the transition-metal oxides; though, we note that neither of the two known cases (LiV 2 O 4 [40] and CaCu 3 Ru 4 O 12 [41]) exhibit superconductivity. The future of research on superconductivity in heavy-fermion compounds is full of promise, and there is every reason to believe that investigations of newly-discovered compounds as well as studies designed to obtain a more comprehensive understanding of known compounds will contribute to resolving the long-standing puzzle of how unconventional superconductivity works.…”

Section: Outlook For Research On Superconductivity In Heavyfermion Comentioning

confidence: 88%

“…A rich phase space emerges from this environment, containing numerous ground states often with quantum critical points residing at their zero-temperature boundaries and with nearby quantum criticality at finite temperatures [38,8,39]. Looking beyond f -electron systems, we note that there are reports of at least two d-electron transition-metal oxides, LiV 2 O 4 [40] and CaCu 3 Ru 4 O 12 [41], that exhibit characteristics consistent with a heavy-fermion state. Neither of these compounds is superconducting, but transition-metal oxide-based heavy-fermion compounds may present an unexplored frontier of heavy-fermion research.…”

Section: Heavy-fermion Compoundsmentioning

confidence: 91%

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Unconventional superconductivity in heavy-fermion compounds

White

Thompson

Maple

2015

Physica C: Superconductivity and its Applications

130

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Over the past 35 years, research on unconventional superconductivity in heavy-fermion systems has evolved from the surprising observations of unprecedented superconducting properties in compounds that convention dictated should not superconduct at all to performing explorations of rich phase spaces in which the delicate interplay between competing ground states appears to support emergent superconducting states. In this article, we review the current understanding of superconductivity in heavy-fermion compounds and identify a set of characteristics that is common to their unconventional superconducting states. These core properties are compared with those of other classes of unconventional superconductors such as the cuprates and iron-based superconductors. We conclude by speculating on the prospects for future research in this field and how new advances might contribute towards resolving the long-standing mystery of how unconventional superconductivity works.

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Section: Outlook For Research On Superconductivity In Heavyfermion Comentioning

confidence: 88%

Section: Heavy-fermion Compoundsmentioning

confidence: 91%

Unconventional superconductivity in heavy-fermion compounds

White

Thompson

Maple

2015

Physica C: Superconductivity and its Applications

130

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“…Typical examples are the Verwey transition in Fe 3 O 4 [57,58], a heavy-fermion state in LiV 2 O 4 [59], and a heptamer formation in AlV 2 O 4 [60].…”

Section: Discussionmentioning

confidence: 99%

Universal mechanism of tetrahedral metal cluster formation in structures with breathing pyrochlore sublattices

Таланов¹,

Таланов²

2017

Nanosystems: Phys. Chem. Math.

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A universal mechanism of tetrahedral metal cluster formation in crystal with geometrically frustrated pyrochlore sublattices is proposed. It has been shown that the critical irreducible representation τ , which generated the formation of metal clusters in non-centrosymmetrical F43m-phases from high symmetry phases with Fd3m space group, is a one dimensional irreducible representation κ 11 (τ 4 (A 2u )) (in Kovalev notation). The structural theory of metal cluster formation based on group theoretical calculations was published earlier for the case of A-ordered spinel. In this work, the theory is generalized in the case of any high symmetry Fd3m structures that include pyrochlore sublattices. We presented a brief review of such structures and mechanisms of the tetrahedral metal cluster formation. The existence of so called "breathing" pyrochlore sublattices in ordered phases is predicted theoretically. The groups of atoms, between which bond clusters, are found. These groups of atoms define electron correlation effects. Examples of tetrahedral metal cluster formation in ordered spinels, ordered lacunar spinels, ordered Laves phases (MgCu 4 Sn structural type) and ordered pyrochlore are considered. The theoretical results are confirmed by the known experimental facts.

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“…Many interesting properties have been found in these compounds, leading to potential applications in various fields. For instance, CaCu 3 Ti 4 O 12 and CaMn 3−x Cu x Mn 4 O 12 show an anomalously high dielectric constant and a giant magneto-resistance, respectively [4,5,[7][8][9]; LaCu 3 Fe 4 O 12 is a negative thermal expansion material [10]; and CaCu 3 Ru 4 O 12 exhibits high metallic electrical conductivity [11,12]. Figure 1 shows the crystal structure of CaCu 3 Ru 4 O 12 .…”

Section: Introductionmentioning

confidence: 99%

“…Fortunately, various alternative elements are expected to substitute Ru on the B-site to reduce the material cost of CaCu3Ru4O12 while keeping its resistivity low. In addition, the electrical conducting mechanism in CaCu3Ru4O12 has been investigated by Kobayashi et al [11], who have shown that not only the Ru-O network, but also Cu 2+ through Kondo coupling [9] between Ru 4d and Cu 3d electrons contributes to the good electrical conduction of the material. This result encourages our scheme to reduce the amount of Ru in CaCu3Ru4O12 by substitution while maintaining a high electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

Element Strategy Using Ru-Mn Substitution in CuO-CaCu3Ru4O12 Composite Ceramics with High Electrical Conductivity

et al. 2017

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CaCu 3 Ru 4−x Mn x O 12 bulks with various substitution amounts x and sintering additive CuO (20 vol.%) were prepared, and the influence of x on the electrical conductivity in a wide temperature range (8-900 K) was investigated. Microstructural observations showed an enhancement of bulk densification upon Mn substitution. Although the resistivity increased with increasing x, the resistivity was as low as a few mΩcm even in the sample with x = 2.00, where half of Ru is substituted by Mn. This high conductivity despite the loss of Ru 4d conduction following the substitution is explained by the A-site (Cu 2+ ) conduction in CaCu 3 Ru 4−x Mn x O 12 . The thermopower of CaCu 3 Ru 4−x Mn x O 12 was found to be influenced by the substitution, and a sign inversion was observed in the substituted samples at low temperature. The partial substitution of Ru by Mn in CaCu 3 Ru 4 O 12 enables the reduction of the materials cost while maintaining good electrical conductivity for applications as a conducting device component.

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LiV<sub>2</sub>O<sub>4</sub>: A heavy fermion transition metal oxide

Cited by 12 publications

References 57 publications

Unconventional superconductivity in heavy-fermion compounds

Unconventional superconductivity in heavy-fermion compounds

Universal mechanism of tetrahedral metal cluster formation in structures with breathing pyrochlore sublattices

Element Strategy Using Ru-Mn Substitution in CuO-CaCu3Ru4O12 Composite Ceramics with High Electrical Conductivity

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