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Кадырова, Н. И.; Захарова, Г. С.; Zainulin, Yu. G.; Volkov, V. L.; D’yachkova, T. V.; Tyutyunnik, A. P.; Зубков, В. Г.

doi:10.1023/a:1026126110138

Cited by 14 publications

(20 citation statements)

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“…204) using the CaCu 3 V 4 O 12 structure as the starting model. In the structural model, Mn, Cu, V, and O atoms were placed at 2 a (0, 0, 0), 6 b (0, 1/2, 1/2), 8 c (1/4, 1/4, 1/4), and 24 g ( x , y , 0) sites, respectively . This model could result in a good fit ( R wp = 5.278%).…”

Section: Resultsmentioning

confidence: 99%

“…The lattice constant a of MnCu3V4O12 at room temperature(7.267 Å) is almost identical to that of CaCu3V4O12 (a =7.281 Å)24 , and the metal-oxygen bond lengths (Mn/Ca-O, Cu-O, and V-O) and V-O-V bond angle are not very different between MnCu3V4O12 and CaCu3V4O12. This is in sharp contrast to the observed behavior in a series of AVO3 perovskites (A = Sr, Ca, and Mn) where the reduced size of A 2+ cation from Sr to Mn is accommodated by a concomitant decrease in the V-O-V angle due to the tilting of VO6 octahedra; the V-O-V angle for AVO3 is about 180°, 161°, and 144° for A = Sr 25 , Ca26 , and Mn 7 , respectively.…”

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confidence: 77%

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A-Site-Ordered Perovskite MnCu₃V₄O₁₂ with a 12-Coordinated Manganese(II)

et al. 2013

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A novel cubic perovskite MnCu3V4O12 has been synthesized at a high pressure and high temperature of 12 GPa and 1373 K. This compound crystallizes in the A-site-ordered perovskite structure (space group Im3) with lattice constant a = 7.26684(10) Å at room temperature. The most notable feature of this compound lies in the fact that the Mn(2+) ion is surrounded by 12 equidistant oxide ions to form a regular icosahedron; the situation of Mn(2+) is unprecedented for the crystal chemistry of an oxide. An anomalously large atomic displacement parameter U(iso)= 0.0222(8) Å(2) is found for Mn(2+) at room temperature, indicating that the thermal oscillation of the small Mn(2+) ion in a large icosahedron is fairly active. Magnetic susceptibility and electric resistivity measurements reveal that 3d electrons of Mn(2+) ions are mainly localized, while 3d electrons in Cu(2+) and V(4+) ions are delocalized and contribute to the metallic conduction.

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Section: Resultsmentioning

confidence: 99%

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confidence: 77%

A-Site-Ordered Perovskite MnCu₃V₄O₁₂ with a 12-Coordinated Manganese(II)

et al. 2013

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“…8) Semiconducting CaCu 3 B 4 O 12 (B = Mn, [9][10][11] Fe 12,13) ) exhibit giant magnetoresistance originating from their ferrimagnetic ordered states. Metallic CaCu 3 B 4 O 12 (B = V, 14,15) Cr, 16,17) Co, Ru [18][19][20][21][22][23][24][25][26] ) exhibit Pauli paramagnetic behavior. The crystal structure of ACu 3 B 4 O 12 is depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

Heavy-Mass Behavior of Ordered Perovskites ACu₃Ru₄O₁₂ (A = Na, Ca, La)

et al. 2009

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We synthesized ACu 3 Ru 4 O 12 (A = Na, Na 0.5 Ca 0.5 , Ca, Ca 0.5 La 0.5 , La) and measured their DC magnetization, AC susceptibility, specific heat, and resistivity, in order to investigate the effects of the hetero-valent substitution. A broad peak in the DC magnetization around 200 K was observed only in CaCu 3 Ru 4 O 12 , suggesting the Kondo effect due to localized Cu 2+ ions. However, the electronic specific heat coefficients γ exhibit large values not only for CaCu 3 Ru 4 O 12 but also for all the other samples. Moreover, the Wilson ratio and the Kadowaki-Woods ratio of our samples are all similar to the values of other heavy-fermion compounds. These results question the Kondo effect as the dominant origin of the mass enhancement, and rather indicate the importance of correlations among itinerant Ru electrons.

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“…4) ACu 3 B 4 O 12 compounds are often synthesized under high-pressure conditions in order to stabilize the squarecoordinated Jahn-Teller Cu 2þ ions in the original 12-fold coordinated positions of the perovskite structure. Vanadium containing ACu 3 B 4 O 12 compounds such as NaCu 3 V 4 O 12 and CaCu 3 V 4 O 12 were synthesized under 8 GPa by Kadyrova et al 5,6) In the present study, we succeeded in synthesizing a new vanadium containing A-site-ordered perovskite YCu 3 V 4 O 12 , and compared the structural and physical properties of ACu 3 V 4 O 12 compounds with A = Na þ , Ca 2þ , and Y 3þ .…”

Section: Introductionmentioning

confidence: 99%

Metallic Behavior in A-Site-Ordered Perovskites ACu₃V₄O₁₂ with A = Na⁺, Ca²⁺, and Y³⁺

et al. 2008

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The A-site-ordered perovskites ACu 3 V 4 O 12 (A = Na þ , Ca 2þ , and Y 3þ ) have been found to be Pauli paramagnetic metals. Bond valence sum calculations, magnetic susceptibility measurement, and electronic structure calculations reveal that both Cu and V orbitals contribute to the metallic conduction. Changing the A-site ions in ACu 3 V 4 O 12 from monovalent to divalent to trivalent ions changes the physical properties in ways that in a rigid band picture can be attributed to the shift of the Fermi energy. The ACu 3 V 4 O 12 compounds, unlike the isostructural metallic CaCu 3 Ru 4 O 12 , show no conclusive evidence of heavy-fermion-like behavior.KEYWORDS: ACu 3 V 4 O 12 (A = Na þ , Ca 2þ , and Y 3þ ), ordered perovskite, high-pressure synthesis, Pauli paramagnetic metal, rigid band

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Cited by 14 publications

References 4 publications

A-Site-Ordered Perovskite MnCu₃V₄O₁₂ with a 12-Coordinated Manganese(II)

A-Site-Ordered Perovskite MnCu₃V₄O₁₂ with a 12-Coordinated Manganese(II)

Heavy-Mass Behavior of Ordered Perovskites ACu₃Ru₄O₁₂ (A = Na, Ca, La)

Metallic Behavior in A-Site-Ordered Perovskites ACu₃V₄O₁₂ with A = Na⁺, Ca²⁺, and Y³⁺

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Untitled

Cited by 14 publications

References 4 publications

A-Site-Ordered Perovskite MnCu3V4O12 with a 12-Coordinated Manganese(II)

A-Site-Ordered Perovskite MnCu3V4O12 with a 12-Coordinated Manganese(II)

Heavy-Mass Behavior of Ordered Perovskites ACu3Ru4O12 (A = Na, Ca, La)

Metallic Behavior in A-Site-Ordered Perovskites ACu3V4O12 with A = Na+, Ca2+, and Y3+

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A-Site-Ordered Perovskite MnCu₃V₄O₁₂ with a 12-Coordinated Manganese(II)

A-Site-Ordered Perovskite MnCu₃V₄O₁₂ with a 12-Coordinated Manganese(II)

Heavy-Mass Behavior of Ordered Perovskites ACu₃Ru₄O₁₂ (A = Na, Ca, La)

Metallic Behavior in A-Site-Ordered Perovskites ACu₃V₄O₁₂ with A = Na⁺, Ca²⁺, and Y³⁺