New Hg based oxycarbonate superconductor HgBa2Sr2Cu2O6+δ(CO3)

M. Uehara; S. Sahoda; H. Nakata; J. Akimitsu; Y. Matsui

doi:10.1016/0921-4534(94)90110-4

New Hg based oxycarbonate superconductor HgBa₂Sr₂Cu₂O_6+δ(CO₃)

M. Uehara, S. Sahoda, H. Nakata, J. Akimitsu, Y. Matsui

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

37 Citations (Scopus)

Abstract

A new Hg based oxycarbonate superconductor HgBa₂Sr₂Cu₂O_6+δ(CO₃) has been found by resistivity and magnetization measurements. The superconductivity has been observed at 66 K by magnetization measurement. The electron-diffraction and HRTEM studies show that the crystal structure basically consisted of [HgBa₂O_2+δ] and [Sr₂CO₃] block layers and has a tetragonal unit cell, with a=3.88 A ̊, c=16.94 A ̊, with an orthorhombic superstructure, with A≈4.5√2a=24.71 A ̊,B≈√2a=5.49 A ̊, C=c=16.94 A ̊, due to the three times periodic replacements of a CO₃ block for HgO_δ in the same c-planes or to a c/2 shift approximately at intervals of three tetragonal cells along the (110) direction. The crystal structure of this compound is described by the following combination: [(Hg_0.5C_0.5)(Ba,Sr)₂O_2.5+δ]+CuO₂+[(Ba,Sr)₂(C_0.5Hg_0.5)O_2.5+δ]+CuO₂.

Original language	English
Pages (from-to)	27-32
Number of pages	6
Journal	Physica C: Superconductivity and its applications
Volume	222
Issue number	1-2
DOIs	https://doi.org/10.1016/0921-4534(94)90110-4
Publication status	Published - Mar 10 1994
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "New Hg based oxycarbonate superconductor HgBa2Sr2Cu2O6+δ(CO3)",

abstract = "A new Hg based oxycarbonate superconductor HgBa2Sr2Cu2O6+δ(CO3) has been found by resistivity and magnetization measurements. The superconductivity has been observed at 66 K by magnetization measurement. The electron-diffraction and HRTEM studies show that the crystal structure basically consisted of [HgBa2O2+δ] and [Sr2CO3] block layers and has a tetragonal unit cell, with a=3.88 A ̊, c=16.94 A ̊, with an orthorhombic superstructure, with A≈4.5√2a=24.71 A ̊,B≈√2a=5.49 A ̊, C=c=16.94 A ̊, due to the three times periodic replacements of a CO3 block for HgOδ in the same c-planes or to a c/2 shift approximately at intervals of three tetragonal cells along the (110) direction. The crystal structure of this compound is described by the following combination: [(Hg0.5C0.5)(Ba,Sr)2O2.5+δ]+CuO2+[(Ba,Sr)2(C0.5Hg0.5)O2.5+δ]+CuO2.",

author = "M. Uehara and S. Sahoda and H. Nakata and J. Akimitsu and Y. Matsui",

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T1 - New Hg based oxycarbonate superconductor HgBa2Sr2Cu2O6+δ(CO3)

AU - Uehara, M.

AU - Sahoda, S.

AU - Nakata, H.

AU - Akimitsu, J.

AU - Matsui, Y.

PY - 1994/3/10

Y1 - 1994/3/10

N2 - A new Hg based oxycarbonate superconductor HgBa2Sr2Cu2O6+δ(CO3) has been found by resistivity and magnetization measurements. The superconductivity has been observed at 66 K by magnetization measurement. The electron-diffraction and HRTEM studies show that the crystal structure basically consisted of [HgBa2O2+δ] and [Sr2CO3] block layers and has a tetragonal unit cell, with a=3.88 A ̊, c=16.94 A ̊, with an orthorhombic superstructure, with A≈4.5√2a=24.71 A ̊,B≈√2a=5.49 A ̊, C=c=16.94 A ̊, due to the three times periodic replacements of a CO3 block for HgOδ in the same c-planes or to a c/2 shift approximately at intervals of three tetragonal cells along the (110) direction. The crystal structure of this compound is described by the following combination: [(Hg0.5C0.5)(Ba,Sr)2O2.5+δ]+CuO2+[(Ba,Sr)2(C0.5Hg0.5)O2.5+δ]+CuO2.

AB - A new Hg based oxycarbonate superconductor HgBa2Sr2Cu2O6+δ(CO3) has been found by resistivity and magnetization measurements. The superconductivity has been observed at 66 K by magnetization measurement. The electron-diffraction and HRTEM studies show that the crystal structure basically consisted of [HgBa2O2+δ] and [Sr2CO3] block layers and has a tetragonal unit cell, with a=3.88 A ̊, c=16.94 A ̊, with an orthorhombic superstructure, with A≈4.5√2a=24.71 A ̊,B≈√2a=5.49 A ̊, C=c=16.94 A ̊, due to the three times periodic replacements of a CO3 block for HgOδ in the same c-planes or to a c/2 shift approximately at intervals of three tetragonal cells along the (110) direction. The crystal structure of this compound is described by the following combination: [(Hg0.5C0.5)(Ba,Sr)2O2.5+δ]+CuO2+[(Ba,Sr)2(C0.5Hg0.5)O2.5+δ]+CuO2.

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New Hg based oxycarbonate superconductor HgBa₂Sr₂Cu₂O_6+δ(CO₃)

Abstract

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