Incommensurate and commensurate superstructures in the oxycarbonate superconductor TlSr4-xBaxCu2(CO3)Oy (x≈2)

Y. Matsui; M. Ogawa; M. Uehara; H. Nakata; J. Akimitsu

doi:10.1016/0921-4534(93)90331-J

Incommensurate and commensurate superstructures in the oxycarbonate superconductor TlSr_4-xBa_xCu₂(CO₃)O_y (x≈2)

Y. Matsui, M. Ogawa, M. Uehara, H. Nakata, J. Akimitsu

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

27 Citations (Scopus)

Abstract

Superstructures of oxycarbonate superconductor TlSr_4-xBa_xCu₂(CO₃)O_y (x=2; T_c=73K) were examined by electron diffraction and HRTEM techniques. Part of the crystals show a commensurate superstructure with a 6a₀ periodicity due to crystallographic shears by c/2 to form -(C-C-C)-(Tl-Tl-Tl)-(C-C-C-)-(Tl-Tl-Tl)- type of sequences along the (100) direction in the basal planes. Incommensurate superstructures with longer periodicities up to 7.4a₀ due to mixed intergrowths of -(C-C-C-C)- and -(C-C-C)- sequences were also observed. The average superstructure periodicity of the present specimen is around 7a₀, which is relatively shorter than the value of 8a₀ previously claimed by Goutenoire et al. [Physica C 210 (1993) 359] for a similar superconductor with T_c=62 K. This suggests the possibility of a close relationship between the modulation periodicity and the transition temperature in the TlSr_4-xBa_xCu₂(CO₃)O_y system with x=1-2.5. Observed structures were compared with an another type of superstructure recently discovered in HgBa₂Sr₂Cu₂(CO₃)O_y by Uehara et al.

Original language	English
Pages (from-to)	287-293
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	217
Issue number	3-4
DOIs	https://doi.org/10.1016/0921-4534(93)90331-J
Publication status	Published - Nov 20 1993
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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@article{20e0bce5de0a41f59e0c8456408388ab,

title = "Incommensurate and commensurate superstructures in the oxycarbonate superconductor TlSr4-xBaxCu2(CO3)Oy (x≈2)",

abstract = "Superstructures of oxycarbonate superconductor TlSr4-xBaxCu2(CO3)Oy (x=2; Tc=73K) were examined by electron diffraction and HRTEM techniques. Part of the crystals show a commensurate superstructure with a 6a0 periodicity due to crystallographic shears by c/2 to form -(C-C-C)-(Tl-Tl-Tl)-(C-C-C-)-(Tl-Tl-Tl)- type of sequences along the (100) direction in the basal planes. Incommensurate superstructures with longer periodicities up to 7.4a0 due to mixed intergrowths of -(C-C-C-C)- and -(C-C-C)- sequences were also observed. The average superstructure periodicity of the present specimen is around 7a0, which is relatively shorter than the value of 8a0 previously claimed by Goutenoire et al. [Physica C 210 (1993) 359] for a similar superconductor with Tc=62 K. This suggests the possibility of a close relationship between the modulation periodicity and the transition temperature in the TlSr4-xBaxCu2(CO3)Oy system with x=1-2.5. Observed structures were compared with an another type of superstructure recently discovered in HgBa2Sr2Cu2(CO3)Oy by Uehara et al.",

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

note = "Funding Information: This work was partly supported by a Grant-In-Aid from the Ministry of Education, Science and Culture, Japan. The Aoyama-Gakuin Group acknowl- edges financial support from the Research Institute of Aoyarna-Gakuin University. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.",

year = "1993",

month = nov,

day = "20",

doi = "10.1016/0921-4534(93)90331-J",

language = "English",

volume = "217",

pages = "287--293",

journal = "Physica C: Superconductivity and its Applications",

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T1 - Incommensurate and commensurate superstructures in the oxycarbonate superconductor TlSr4-xBaxCu2(CO3)Oy (x≈2)

AU - Matsui, Y.

AU - Ogawa, M.

AU - Uehara, M.

AU - Nakata, H.

AU - Akimitsu, J.

N1 - Funding Information: This work was partly supported by a Grant-In-Aid from the Ministry of Education, Science and Culture, Japan. The Aoyama-Gakuin Group acknowl- edges financial support from the Research Institute of Aoyarna-Gakuin University. Copyright: Copyright 2014 Elsevier B.V., All rights reserved.

PY - 1993/11/20

Y1 - 1993/11/20

N2 - Superstructures of oxycarbonate superconductor TlSr4-xBaxCu2(CO3)Oy (x=2; Tc=73K) were examined by electron diffraction and HRTEM techniques. Part of the crystals show a commensurate superstructure with a 6a0 periodicity due to crystallographic shears by c/2 to form -(C-C-C)-(Tl-Tl-Tl)-(C-C-C-)-(Tl-Tl-Tl)- type of sequences along the (100) direction in the basal planes. Incommensurate superstructures with longer periodicities up to 7.4a0 due to mixed intergrowths of -(C-C-C-C)- and -(C-C-C)- sequences were also observed. The average superstructure periodicity of the present specimen is around 7a0, which is relatively shorter than the value of 8a0 previously claimed by Goutenoire et al. [Physica C 210 (1993) 359] for a similar superconductor with Tc=62 K. This suggests the possibility of a close relationship between the modulation periodicity and the transition temperature in the TlSr4-xBaxCu2(CO3)Oy system with x=1-2.5. Observed structures were compared with an another type of superstructure recently discovered in HgBa2Sr2Cu2(CO3)Oy by Uehara et al.

AB - Superstructures of oxycarbonate superconductor TlSr4-xBaxCu2(CO3)Oy (x=2; Tc=73K) were examined by electron diffraction and HRTEM techniques. Part of the crystals show a commensurate superstructure with a 6a0 periodicity due to crystallographic shears by c/2 to form -(C-C-C)-(Tl-Tl-Tl)-(C-C-C-)-(Tl-Tl-Tl)- type of sequences along the (100) direction in the basal planes. Incommensurate superstructures with longer periodicities up to 7.4a0 due to mixed intergrowths of -(C-C-C-C)- and -(C-C-C)- sequences were also observed. The average superstructure periodicity of the present specimen is around 7a0, which is relatively shorter than the value of 8a0 previously claimed by Goutenoire et al. [Physica C 210 (1993) 359] for a similar superconductor with Tc=62 K. This suggests the possibility of a close relationship between the modulation periodicity and the transition temperature in the TlSr4-xBaxCu2(CO3)Oy system with x=1-2.5. Observed structures were compared with an another type of superstructure recently discovered in HgBa2Sr2Cu2(CO3)Oy by Uehara et al.

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