Electron microscope studies of nano-domain structures in Ru-based magneto-superconductors: RuSr2Gd1.5Ce0.5Cu 2O10-δ (Ru-1222) and RuSr2GdCu 2O8 (Ru-1212)

Tadahiro Yokosawa; Veer Pal Singh Awana; Koji Kimoto; Eiji Takayama-Muromachi; Maarit Karppinen; Hisao Yamauchi; Yoshio Matsui

doi:10.1016/j.ultramic.2003.08.021

Electron microscope studies of nano-domain structures in Ru-based magneto-superconductors: RuSr₂Gd_1.5Ce_0.5Cu ₂O_10-δ (Ru-1222) and RuSr₂GdCu ₂O₈ (Ru-1212)

Tadahiro Yokosawa^*
, Veer Pal Singh Awana
, Koji Kimoto
, Eiji Takayama-Muromachi
, Maarit Karppinen
, Hisao Yamauchi
, Yoshio Matsui

^*Corresponding author for this work

Not published at Aalto University

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

16 Citations (Scopus)

Abstract

Microstructures of the RuSr₂Gd_1.5Ce _0.5Cu₂O_10-δ (Ru-1222) and RuSr ₂GdCu₂O₈ (Ru-1212) magneto-superconductors have been investigated by using selected-area electron diffraction, convergent-beam electron diffraction, dark-field electron microscopy and high-resolution electron microscopy at room temperature. Both Ru-1212 and Ru-1222 consist of nm-size domains stacked along the c direction, where the domains are formed by two types of superstructures due to ordering of rotated RuO₆ octahedra about the c-axis. In Ru-1212, both primitive-and body-centered tetragonal superstructures (the possible space groups: P4/mbm and I4/mcm) are derived to form the corresponding nm-domains. It is of great interest that Ru-1212 consists of domains of two crystallographically different superstructures, while the similar domains observed in Ru-1222 have crystallographically identical superstructure with an orthorhombic symmetry (possible space group: Aeam), related by 90°rotation around the c-axis (Yokosawa et al., 2003, submitted for publication).

Original language	English
Pages (from-to)	283-295
Number of pages	13
Journal	ULTRAMICROSCOPY
Volume	98
Issue number	2-4
DOIs	https://doi.org/10.1016/j.ultramic.2003.08.021
Publication status	Published - 1 Jan 2004
MoE publication type	A1 Journal article-refereed

Funding

The authors are grateful to Drs. C. Tsuruta, M. Uchida, T. Asaka and T. Nagai for their skillful technical assistance with the present experiments and helpful discussion. A part of this work was supported by “Nanotechnology Support Project” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

Keywords

1222- and 1212-type structures
61.14.Lj
61.66.Fn
68.37.Lp
74.72.Jt
Electron diffraction
Electron microscopy
Nano-domain
Rutheno-cuprate
Superlattice

Access to Document

10.1016/j.ultramic.2003.08.021

Cite this

@article{9b3259a083f847f4a93f36b1b0f5760a,

title = "Electron microscope studies of nano-domain structures in Ru-based magneto-superconductors: RuSr2Gd1.5Ce0.5Cu 2O10-δ (Ru-1222) and RuSr2GdCu 2O8 (Ru-1212)",

abstract = "Microstructures of the RuSr2Gd1.5Ce 0.5Cu2O10-δ (Ru-1222) and RuSr 2GdCu2O8 (Ru-1212) magneto-superconductors have been investigated by using selected-area electron diffraction, convergent-beam electron diffraction, dark-field electron microscopy and high-resolution electron microscopy at room temperature. Both Ru-1212 and Ru-1222 consist of nm-size domains stacked along the c direction, where the domains are formed by two types of superstructures due to ordering of rotated RuO6 octahedra about the c-axis. In Ru-1212, both primitive-and body-centered tetragonal superstructures (the possible space groups: P4/mbm and I4/mcm) are derived to form the corresponding nm-domains. It is of great interest that Ru-1212 consists of domains of two crystallographically different superstructures, while the similar domains observed in Ru-1222 have crystallographically identical superstructure with an orthorhombic symmetry (possible space group: Aeam), related by 90°rotation around the c-axis (Yokosawa et al., 2003, submitted for publication).",

keywords = "1222- and 1212-type structures, 61.14.Lj, 61.66.Fn, 68.37.Lp, 74.72.Jt, Electron diffraction, Electron microscopy, Nano-domain, Rutheno-cuprate, Superlattice",

author = "Tadahiro Yokosawa and Awana, \{Veer Pal Singh\} and Koji Kimoto and Eiji Takayama-Muromachi and Maarit Karppinen and Hisao Yamauchi and Yoshio Matsui",

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T1 - Electron microscope studies of nano-domain structures in Ru-based magneto-superconductors

T2 - RuSr2Gd1.5Ce0.5Cu 2O10-δ (Ru-1222) and RuSr2GdCu 2O8 (Ru-1212)

AU - Yokosawa, Tadahiro

AU - Awana, Veer Pal Singh

AU - Kimoto, Koji

AU - Takayama-Muromachi, Eiji

AU - Karppinen, Maarit

AU - Yamauchi, Hisao

AU - Matsui, Yoshio

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Y1 - 2004/1/1

N2 - Microstructures of the RuSr2Gd1.5Ce 0.5Cu2O10-δ (Ru-1222) and RuSr 2GdCu2O8 (Ru-1212) magneto-superconductors have been investigated by using selected-area electron diffraction, convergent-beam electron diffraction, dark-field electron microscopy and high-resolution electron microscopy at room temperature. Both Ru-1212 and Ru-1222 consist of nm-size domains stacked along the c direction, where the domains are formed by two types of superstructures due to ordering of rotated RuO6 octahedra about the c-axis. In Ru-1212, both primitive-and body-centered tetragonal superstructures (the possible space groups: P4/mbm and I4/mcm) are derived to form the corresponding nm-domains. It is of great interest that Ru-1212 consists of domains of two crystallographically different superstructures, while the similar domains observed in Ru-1222 have crystallographically identical superstructure with an orthorhombic symmetry (possible space group: Aeam), related by 90°rotation around the c-axis (Yokosawa et al., 2003, submitted for publication).

AB - Microstructures of the RuSr2Gd1.5Ce 0.5Cu2O10-δ (Ru-1222) and RuSr 2GdCu2O8 (Ru-1212) magneto-superconductors have been investigated by using selected-area electron diffraction, convergent-beam electron diffraction, dark-field electron microscopy and high-resolution electron microscopy at room temperature. Both Ru-1212 and Ru-1222 consist of nm-size domains stacked along the c direction, where the domains are formed by two types of superstructures due to ordering of rotated RuO6 octahedra about the c-axis. In Ru-1212, both primitive-and body-centered tetragonal superstructures (the possible space groups: P4/mbm and I4/mcm) are derived to form the corresponding nm-domains. It is of great interest that Ru-1212 consists of domains of two crystallographically different superstructures, while the similar domains observed in Ru-1222 have crystallographically identical superstructure with an orthorhombic symmetry (possible space group: Aeam), related by 90°rotation around the c-axis (Yokosawa et al., 2003, submitted for publication).

KW - 1222- and 1212-type structures

KW - 61.14.Lj

KW - 61.66.Fn

KW - 68.37.Lp

KW - 74.72.Jt

KW - Electron diffraction

KW - Electron microscopy

KW - Nano-domain

KW - Rutheno-cuprate

KW - Superlattice

UR - https://www.scopus.com/pages/publications/1842587948

U2 - 10.1016/j.ultramic.2003.08.021

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