Superconductivity appearing from C60 doped with rare-earth metals

Misaho Akada; Toshinari Hirai; Junji Takeuchi; Takao Yamamoto; Ryotaro Kumashiro; Katsumi Tanigaki

Superconductivity appearing from C₆₀ doped with rare-earth metals

Misaho Akada, Toshinari Hirai, Junji Takeuchi, Takao Yamamoto, Ryotaro Kumashiro, Katsumi Tanigaki

Advanced Institute for Materials Research (AIMR)

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

7 Citations (Scopus)

Abstract

The superconductivity observed in rare-earth C₆₀ fullerides RE_x C₆₀ (RE = Yb and Sm) and La - C₆₀ compounds are described. It is shown that RE_2.75 C₆₀'s do not superconduct and the true superconducting phase in Yb - C₆₀ fulleride resides in the t_{1 g} band. No superconductivity is observed in Sm - C₆₀ fullerides. The phase sequence between Yb - C₆₀ fullerides and Sm - C₆₀ ones as a function of the intercalant concentration is shown to be greatly different, although Yb and Sm are the same family of divalent rare-earth elements. This seems to explain the loss of superconductivity in Sm_x C₆₀, and suggests that the true superconducting phase is most likely Yb_x C₆₀(x > 3) with the primitive cubic lattice. In addition, the superconductivity observed in C₆₀ with La is shown to result from La₂ C₃ carbides with two transition temperatures.

Original language	English
Pages (from-to)	S83-S87
Journal	Science and Technology of Advanced Materials
Volume	7
Issue number	SUPPL. 1
Publication status	Published - 2006

Keywords

Fullerenes and related materials
Superconductivity

ASJC Scopus subject areas

Materials Science(all)

Cite this

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title = "Superconductivity appearing from C60 doped with rare-earth metals",

abstract = "The superconductivity observed in rare-earth C60 fullerides REx C60 (RE = Yb and Sm) and La - C60 compounds are described. It is shown that RE2.75 C60's do not superconduct and the true superconducting phase in Yb - C60 fulleride resides in the t1 g band. No superconductivity is observed in Sm - C60 fullerides. The phase sequence between Yb - C60 fullerides and Sm - C60 ones as a function of the intercalant concentration is shown to be greatly different, although Yb and Sm are the same family of divalent rare-earth elements. This seems to explain the loss of superconductivity in Smx C60, and suggests that the true superconducting phase is most likely Ybx C60(x > 3) with the primitive cubic lattice. In addition, the superconductivity observed in C60 with La is shown to result from La2 C3 carbides with two transition temperatures.",

keywords = "Fullerenes and related materials, Superconductivity",

author = "Misaho Akada and Toshinari Hirai and Junji Takeuchi and Takao Yamamoto and Ryotaro Kumashiro and Katsumi Tanigaki",

note = "Funding Information: The synchrotron radiation experiments were performed by the approval of the Japan Synchrotron Radiation Research Institute (JASRI) as Nanotechnology Support Project. This work was supported by Creation of Nanodevices and Systems Based on New Physical Phenomena and Functional Principles of CREST of JST. The present work is also partially supported by the Tohoku University 21 century COE program “Particle-Matter Hierarchy” of MEXT Japan. This work was performed by a Grant-in-Aid from the Ministry of Education, Culture, Sports, Science, and Technology of Japan, Nos. 18204030, 18651075, 17038001 and 17710088.",

year = "2006",

language = "English",

volume = "7",

pages = "S83--S87",

journal = "Science and Technology of Advanced Materials",

issn = "1468-6996",

publisher = "IOP Publishing Ltd.",

number = "SUPPL. 1",

}

TY - JOUR

T1 - Superconductivity appearing from C60 doped with rare-earth metals

AU - Akada, Misaho

AU - Hirai, Toshinari

AU - Takeuchi, Junji

AU - Yamamoto, Takao

AU - Kumashiro, Ryotaro

AU - Tanigaki, Katsumi

N1 - Funding Information: The synchrotron radiation experiments were performed by the approval of the Japan Synchrotron Radiation Research Institute (JASRI) as Nanotechnology Support Project. This work was supported by Creation of Nanodevices and Systems Based on New Physical Phenomena and Functional Principles of CREST of JST. The present work is also partially supported by the Tohoku University 21 century COE program “Particle-Matter Hierarchy” of MEXT Japan. This work was performed by a Grant-in-Aid from the Ministry of Education, Culture, Sports, Science, and Technology of Japan, Nos. 18204030, 18651075, 17038001 and 17710088.

PY - 2006

Y1 - 2006

N2 - The superconductivity observed in rare-earth C60 fullerides REx C60 (RE = Yb and Sm) and La - C60 compounds are described. It is shown that RE2.75 C60's do not superconduct and the true superconducting phase in Yb - C60 fulleride resides in the t1 g band. No superconductivity is observed in Sm - C60 fullerides. The phase sequence between Yb - C60 fullerides and Sm - C60 ones as a function of the intercalant concentration is shown to be greatly different, although Yb and Sm are the same family of divalent rare-earth elements. This seems to explain the loss of superconductivity in Smx C60, and suggests that the true superconducting phase is most likely Ybx C60(x > 3) with the primitive cubic lattice. In addition, the superconductivity observed in C60 with La is shown to result from La2 C3 carbides with two transition temperatures.

AB - The superconductivity observed in rare-earth C60 fullerides REx C60 (RE = Yb and Sm) and La - C60 compounds are described. It is shown that RE2.75 C60's do not superconduct and the true superconducting phase in Yb - C60 fulleride resides in the t1 g band. No superconductivity is observed in Sm - C60 fullerides. The phase sequence between Yb - C60 fullerides and Sm - C60 ones as a function of the intercalant concentration is shown to be greatly different, although Yb and Sm are the same family of divalent rare-earth elements. This seems to explain the loss of superconductivity in Smx C60, and suggests that the true superconducting phase is most likely Ybx C60(x > 3) with the primitive cubic lattice. In addition, the superconductivity observed in C60 with La is shown to result from La2 C3 carbides with two transition temperatures.

KW - Fullerenes and related materials

KW - Superconductivity

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ER -

Superconductivity appearing from C₆₀ doped with rare-earth metals

Abstract

Keywords

ASJC Scopus subject areas

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