Control of Hole Distribution and Superconducting Properties in Bi2Sr2(Ca1-xYx)Cu2O 8+δ

Miia Kotiranta; T. Nakane; M. Karppinen; H. Yamauchi; L. Niinistö

doi:10.1023/a:1022530219507

Control of Hole Distribution and Superconducting Properties in Bi₂Sr₂(Ca_1-xY_x)Cu₂O _8+δ

Miia Kotiranta^*
, T. Nakane
, M. Karppinen
, H. Yamauchi
, L. Niinistö

^*Corresponding author for this work

Department of Chemistry and Materials Science

Tokyo Institute of Technology

Research output: Contribution to journal › Article › Scientific › peer-review

8 Citations (Scopus)

Abstract

The dependence of H_irr on the concentration and distribution of holes in the Bi₂Sr₂(Ca_1-xY_x)Cu₂O _8+δ (Bi-2212) system was investigated. Coulometric Cu(I)/(II) and Fe(II)/(III) titrations were applied to determine oxygen contents and distinct Cu and Bi valences and to thereby estimate the hole distribution among the SrO-Bi₂O_2+δ-SrO and (Ca_1-xY_x)Cu₂O₄ blocks. With increasing Y-substitution level, x, continuous increase in the oxygen content and decrease in the thickness of the SrO-Bi₂U_2+δ-SrO "blocking" block were observed. The extra oxygen taken in the structure only partially counteracts the trivalent-Y to divalent-Ca substitution, and consequently the hole concentration in both blocks was found to decrease. With increasing x and δ, H_irr was not enhanced but rather depressed. This suggests that the thickness of the blocking block is not the primary parameter in determining the H_irr.

Original language	English
Pages (from-to)	837-841
Number of pages	5
Journal	Journal of Low Temperature Physics
Volume	117
Issue number	3-4
DOIs	https://doi.org/10.1023/a:1022530219507
Publication status	Published - 1 Jan 1999
MoE publication type	A1 Journal article-refereed

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@article{1cbde3bfdcfe44b58699e8dc355bb08b,

title = "Control of Hole Distribution and Superconducting Properties in Bi2Sr2(Ca1-xYx)Cu2O 8+δ",

abstract = "The dependence of Hirr on the concentration and distribution of holes in the Bi2Sr2(Ca1-xYx)Cu2O 8+δ (Bi-2212) system was investigated. Coulometric Cu(I)/(II) and Fe(II)/(III) titrations were applied to determine oxygen contents and distinct Cu and Bi valences and to thereby estimate the hole distribution among the SrO-Bi2O2+δ-SrO and (Ca1-xYx)Cu2O4 blocks. With increasing Y-substitution level, x, continuous increase in the oxygen content and decrease in the thickness of the SrO-Bi2U2+δ-SrO {"}blocking{"} block were observed. The extra oxygen taken in the structure only partially counteracts the trivalent-Y to divalent-Ca substitution, and consequently the hole concentration in both blocks was found to decrease. With increasing x and δ, Hirr was not enhanced but rather depressed. This suggests that the thickness of the blocking block is not the primary parameter in determining the Hirr.",

author = "Miia Kotiranta and T. Nakane and M. Karppinen and H. Yamauchi and L. Niinist{\"o}",

year = "1999",

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T1 - Control of Hole Distribution and Superconducting Properties in Bi2Sr2(Ca1-xYx)Cu2O 8+δ

AU - Kotiranta, Miia

AU - Nakane, T.

AU - Karppinen, M.

AU - Yamauchi, H.

AU - Niinistö, L.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - The dependence of Hirr on the concentration and distribution of holes in the Bi2Sr2(Ca1-xYx)Cu2O 8+δ (Bi-2212) system was investigated. Coulometric Cu(I)/(II) and Fe(II)/(III) titrations were applied to determine oxygen contents and distinct Cu and Bi valences and to thereby estimate the hole distribution among the SrO-Bi2O2+δ-SrO and (Ca1-xYx)Cu2O4 blocks. With increasing Y-substitution level, x, continuous increase in the oxygen content and decrease in the thickness of the SrO-Bi2U2+δ-SrO "blocking" block were observed. The extra oxygen taken in the structure only partially counteracts the trivalent-Y to divalent-Ca substitution, and consequently the hole concentration in both blocks was found to decrease. With increasing x and δ, Hirr was not enhanced but rather depressed. This suggests that the thickness of the blocking block is not the primary parameter in determining the Hirr.

AB - The dependence of Hirr on the concentration and distribution of holes in the Bi2Sr2(Ca1-xYx)Cu2O 8+δ (Bi-2212) system was investigated. Coulometric Cu(I)/(II) and Fe(II)/(III) titrations were applied to determine oxygen contents and distinct Cu and Bi valences and to thereby estimate the hole distribution among the SrO-Bi2O2+δ-SrO and (Ca1-xYx)Cu2O4 blocks. With increasing Y-substitution level, x, continuous increase in the oxygen content and decrease in the thickness of the SrO-Bi2U2+δ-SrO "blocking" block were observed. The extra oxygen taken in the structure only partially counteracts the trivalent-Y to divalent-Ca substitution, and consequently the hole concentration in both blocks was found to decrease. With increasing x and δ, Hirr was not enhanced but rather depressed. This suggests that the thickness of the blocking block is not the primary parameter in determining the Hirr.

UR - https://www.scopus.com/pages/publications/0033356410

U2 - 10.1023/a:1022530219507

DO - 10.1023/a:1022530219507

M3 - Article

AN - SCOPUS:0033356410

SN - 0022-2291

VL - 117

SP - 837

EP - 841

JO - Journal of Low Temperature Physics

JF - Journal of Low Temperature Physics

IS - 3-4

ER -

Control of Hole Distribution and Superconducting Properties in Bi₂Sr₂(Ca_1-xY_x)Cu₂O _8+δ

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