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Kambe, Shiro; Matsuoka, Teruyuki; Takahasi, Makoto; Kawai, Maki; Kawai, Tomoji

doi:10.1103/physrevb.42.2669

Cited by 82 publications

(11 citation statements)

References 12 publications

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“…In Ref. 6, we found that the modulation wave number is determined by the O-Cu-O length. The slope of σ versus l for the Pb-substituted Bi2212 phase is smaller than that of the Pb-free Bi2212 phase, which is explained by the concept that the Bi(Pb)O length is extended beyond the BiO length by the substitution of Bi with Pb.…”

Section: Resultsmentioning

confidence: 97%

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Origin of the modulation structure of Pb-substituted Bi2212 superconductors

Shimabukuro

Katsushika

Naminoue

et al. 2020

Trans. Mat. Res. Soc. Japan

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To elucidate the effect of Pb substitution on the modulation structure of the Bi2212 phase, we prepared Pb-free Bi2Sr1.8(Ca1-xYx)Cu2Oy and Pb-substituted Bi1.6Pb0.4Sr1.8(Ca1-xYx)Cu2Oy. For both the Pb-free and Pb-substituted Bi-2212 phases, the modulation wave number σ increased with increasing oxygen content y. This tendency is explained by the excess oxygen that is inserted into the BiO layer and leads to the formation of the modulation structure. For the Pb-free Bi2212 phase, σ increased with increasing O-Cu-O length l. This tendency is explained by the lattice mismatch that exists between the O-Bi-O and O-Cu-O layers. In contrast, for the Pb-substituted Bi2212 phase, σ changed only slightly with increasing l, revealing that the relaxation mechanism for lattice mismatch in the Pb-substituted Bi2212 phase is different from that of the Pb-free Bi2212 phase. A possible mechanism for relaxation of lattice mismatch is the change in Pb valence. As the Pb valence increases from 2+ to 4+, the ionic radius of Pb decreases, suggesting that l decreases and the mismatch between the O-Cu-O and Bi(Pb)O lengths decreases.

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Section: Resultsmentioning

confidence: 97%

“…On the other hand, the original modulation structure of Pb-free Bi2223 phase still remains when cooled down to 30 K 5) . For the Pbsubstituted Bi2201 and Bi2212 phases, the original modulation has been shown to disappear after N2 annealing and to exhibit higher Tc 6,7) .…”

Section: Introductionmentioning

confidence: 99%

Origin of the modulation structure of Pb-substituted Bi2212 superconductors

Shimabukuro

Katsushika

Naminoue

et al. 2020

Trans. Mat. Res. Soc. Japan

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“…It is found that both T c and T on are increased with increasing melting time up to 3. [24]. On the light of these observations, one can say that the presence of both oxygen vacancies and lattice variations in Bi (Pb): 2212 system may reduce the path of current flow in the system and eventually the superconductivity is improved.…”

Section: Resistivity and Hall Coefficientmentioning

confidence: 91%

Effect of melting time on the superconductivity in Bi1.7Pb0.3Sr2CaCu2O8 superconducting system

Sedky

2010

Journal of Alloys and Compounds

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“…13), 14) The oxonium ion content was estimated by equation z = 4 -(Co valence) -x. Therefore, the amount of H2O, y' is calculated by y' = y -z.…”

Section: Methodsmentioning

confidence: 99%

Strong correlation between y'/x and superconductivity of Nax(H3O)zCoO2 y'H2O

Abe

Kambe

Chong

et al. 2008

J. Ceram. Soc. Japan

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We prepared single-phase Nax(H3O)zCoO2·y'H2O with varying amount of Br2 volume in acetonitrile, and examined the Na + content (x), H3O + content (z), H2O content (y') and Tc. By changing the amount of Br2 during preparation, the amount of x in Nax(H3O)zCoO2·y'H2O was controlled from 0.282 to 0.359. It was found that superconductivity is not correlated with Co valence but with y'/x, that is, the coordination number of Na + with H2O, and secondly with x/x+z, that is, the ratio of Na + ion in the (Na + + H3O + ) site, suggesting that shielding effect of Nax(H3O)zCoO2·y'H2O governs superconductivity.

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Superconductive transition at 98.5 K in monoclinic (Bi,Pb)2Sr2
Shiro Kambe
¹
,
Teruyuki Matsuoka
²
,
Makoto Takahasi
³

et al.

Cited by 82 publications

References 12 publications

Origin of the modulation structure of Pb-substituted Bi2212 superconductors

Origin of the modulation structure of Pb-substituted Bi2212 superconductors

Effect of melting time on the superconductivity in Bi1.7Pb0.3Sr2CaCu2O8 superconducting system

Strong correlation between y'/x and superconductivity of Nax(H3O)zCoO2 y'H2O

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Superconductive transition at 98.5 K in monoclinic (Bi,Pb)2Sr2Shiro Kambe1, Teruyuki Matsuoka2, Makoto Takahasi3 et al.

Cited by 82 publications

References 12 publications

Origin of the modulation structure of Pb-substituted Bi2212 superconductors

Origin of the modulation structure of Pb-substituted Bi2212 superconductors

Effect of melting time on the superconductivity in Bi1.7Pb0.3Sr2CaCu2O8 superconducting system

Strong correlation between y'/x and superconductivity of Nax(H3O)zCoO2 y'H2O

Contact Info

Product

Resources

About

Superconductive transition at 98.5 K in monoclinic (Bi,Pb)2Sr2
Shiro Kambe
¹
,
Teruyuki Matsuoka
²
,
Makoto Takahasi
³

et al.