Photoemission study of Ca-intercalated graphite superconductor CaC 6

Hiroyuki Okazaki; Rikiya Yoshida; Keisuke Iwai; Kengo Noami; Takayuki Muro; Tetsuya Nakamura; Takanori Wakita; Yuji Muraoka; Masaaki Hirai; Fumiaki Tomioka; Yoshihiko Takano; Asami Takenaka; Masahiro Toyoda; Tamio Oguchi; Takayoshi Yokoya

doi:10.1016/j.physc.2009.10.039

Photoemission study of Ca-intercalated graphite superconductor CaC ₆

Hiroyuki Okazaki, Rikiya Yoshida, Keisuke Iwai, Kengo Noami, Takayuki Muro, Tetsuya Nakamura, Takanori Wakita, Yuji Muraoka, Masaaki Hirai, Fumiaki Tomioka, Yoshihiko Takano, Asami Takenaka, Masahiro Toyoda, Tamio Oguchi, Takayoshi Yokoya

International Center for Synchrotron Radiation Innovation Smart (SRIS)

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

Abstract

In this work, we have performed resonant photoemission studies of Ca-intercalated graphite superconductor CaC₆. Using photon energy of the Ca 2p-3d threshold, the photoemission intensity of the peak at Fermi energy (EF) is resonantly enhanced. This result provides spectroscopic evidence for the existence of Ca 3d states at EF, and strongly supports that Ca 3d state plays a crucial role for the superconductivity of this material with relatively high Tc.

Original language	English
Pages (from-to)	S637-S638
Journal	Physica C: Superconductivity and its Applications
Volume	470
Issue number	SUPPL.1
DOIs	https://doi.org/10.1016/j.physc.2009.10.039
Publication status	Published - 2010 Dec

Keywords

CaC
Graphite intercalation compound
Resonant photoemission spectroscopy

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10.1016/j.physc.2009.10.039

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Okazaki, H., Yoshida, R., Iwai, K., Noami, K., Muro, T., Nakamura, T., Wakita, T., Muraoka, Y., Hirai, M., Tomioka, F., Takano, Y., Takenaka, A., Toyoda, M., Oguchi, T., & Yokoya, T. (2010). Photoemission study of Ca-intercalated graphite superconductor CaC ₆. Physica C: Superconductivity and its Applications, 470(SUPPL.1), S637-S638. https://doi.org/10.1016/j.physc.2009.10.039

@article{d48f98987556452483e5b6b8c7d0d47f,

title = "Photoemission study of Ca-intercalated graphite superconductor CaC 6",

abstract = "In this work, we have performed resonant photoemission studies of Ca-intercalated graphite superconductor CaC6. Using photon energy of the Ca 2p-3d threshold, the photoemission intensity of the peak at Fermi energy (EF) is resonantly enhanced. This result provides spectroscopic evidence for the existence of Ca 3d states at EF, and strongly supports that Ca 3d state plays a crucial role for the superconductivity of this material with relatively high Tc.",

keywords = "CaC, Graphite intercalation compound, Resonant photoemission spectroscopy",

author = "Hiroyuki Okazaki and Rikiya Yoshida and Keisuke Iwai and Kengo Noami and Takayuki Muro and Tetsuya Nakamura and Takanori Wakita and Yuji Muraoka and Masaaki Hirai and Fumiaki Tomioka and Yoshihiko Takano and Asami Takenaka and Masahiro Toyoda and Tamio Oguchi and Takayoshi Yokoya",

note = "Funding Information: We thank Y. Kubozono, Y. Ohta, and N. Kawasaki for sample preparation. We also thank K. Okada for fruitful discussions. This work was supported partially by a Grant-in-Aid for Scientific Research of the Ministry of Education, Culture, Sports, Science and Technology, Japan. This experiment at SPring-8 was performed under a proposal number 2008A1740.",

year = "2010",

month = dec,

doi = "10.1016/j.physc.2009.10.039",

language = "English",

volume = "470",

pages = "S637--S638",

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

issn = "0921-4534",

publisher = "Elsevier",

number = "SUPPL.1",

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Okazaki, H, Yoshida, R, Iwai, K, Noami, K, Muro, T, Nakamura, T, Wakita, T, Muraoka, Y, Hirai, M, Tomioka, F, Takano, Y, Takenaka, A, Toyoda, M, Oguchi, T & Yokoya, T 2010, 'Photoemission study of Ca-intercalated graphite superconductor CaC ₆', Physica C: Superconductivity and its Applications, vol. 470, no. SUPPL.1, pp. S637-S638. https://doi.org/10.1016/j.physc.2009.10.039

TY - JOUR

T1 - Photoemission study of Ca-intercalated graphite superconductor CaC 6

AU - Okazaki, Hiroyuki

AU - Yoshida, Rikiya

AU - Iwai, Keisuke

AU - Noami, Kengo

AU - Muro, Takayuki

AU - Nakamura, Tetsuya

AU - Wakita, Takanori

AU - Muraoka, Yuji

AU - Hirai, Masaaki

AU - Tomioka, Fumiaki

AU - Takano, Yoshihiko

AU - Takenaka, Asami

AU - Toyoda, Masahiro

AU - Oguchi, Tamio

AU - Yokoya, Takayoshi

N1 - Funding Information: We thank Y. Kubozono, Y. Ohta, and N. Kawasaki for sample preparation. We also thank K. Okada for fruitful discussions. This work was supported partially by a Grant-in-Aid for Scientific Research of the Ministry of Education, Culture, Sports, Science and Technology, Japan. This experiment at SPring-8 was performed under a proposal number 2008A1740.

PY - 2010/12

Y1 - 2010/12

N2 - In this work, we have performed resonant photoemission studies of Ca-intercalated graphite superconductor CaC6. Using photon energy of the Ca 2p-3d threshold, the photoemission intensity of the peak at Fermi energy (EF) is resonantly enhanced. This result provides spectroscopic evidence for the existence of Ca 3d states at EF, and strongly supports that Ca 3d state plays a crucial role for the superconductivity of this material with relatively high Tc.

AB - In this work, we have performed resonant photoemission studies of Ca-intercalated graphite superconductor CaC6. Using photon energy of the Ca 2p-3d threshold, the photoemission intensity of the peak at Fermi energy (EF) is resonantly enhanced. This result provides spectroscopic evidence for the existence of Ca 3d states at EF, and strongly supports that Ca 3d state plays a crucial role for the superconductivity of this material with relatively high Tc.

KW - CaC

KW - Graphite intercalation compound

KW - Resonant photoemission spectroscopy

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SN - 0921-4534

VL - 470

SP - S637-S638

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - SUPPL.1

ER -

Photoemission study of Ca-intercalated graphite superconductor CaC ₆

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Keywords

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