Anisotropic s-wave superconductors studied by angle-resolved photoemission spectroscopy

Takayoshi Yokoya, T. Baba, S. Tsuda, T. Kiss, A. Chainani, S. Shin, T. Watanabe, Minoru Nohara, T. Hanaguri, H. Takagi, Y. Takano, H. Kito, J. Itoh, H. Harima, T. Oguchi

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We review our angle-resolved photoemission spectroscopy (ARPES) results across superconducting transitions in 2H-NbSe2 and MgB2, and also show recent results on YNi2B2C. For 2H-NbSe 2 and MgB2, we observe that the superconducting gap exhibits clear Fermi surface (FS) sheet dependence for two types of FS sheets with different characters, thus providing evidence that the FS sheet dependence is a general feature for a superconductor having multiple FS sheets of different character. In YNi2B2C, we show experimental FSs, and momentum-dependent superconducting gap showing large anisotropy observed on a single FS. These ARPES results provide direct evidence for and importance of momentum-dependent superconducting gaps of phonon-mediated superconductors.

Original languageEnglish
Pages (from-to)277-281
Number of pages5
JournalJournal of Physics and Chemistry of Solids
Volume67
Issue number1-3
DOIs
Publication statusPublished - Jan 2006
Externally publishedYes

Fingerprint

Fermi surface
Photoelectron spectroscopy
Superconducting materials
Fermi surfaces
photoelectric emission
spectroscopy
Momentum
momentum
Anisotropy
anisotropy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Anisotropic s-wave superconductors studied by angle-resolved photoemission spectroscopy. / Yokoya, Takayoshi; Baba, T.; Tsuda, S.; Kiss, T.; Chainani, A.; Shin, S.; Watanabe, T.; Nohara, Minoru; Hanaguri, T.; Takagi, H.; Takano, Y.; Kito, H.; Itoh, J.; Harima, H.; Oguchi, T.

In: Journal of Physics and Chemistry of Solids, Vol. 67, No. 1-3, 01.2006, p. 277-281.

Research output: Contribution to journalArticle

Yokoya, T, Baba, T, Tsuda, S, Kiss, T, Chainani, A, Shin, S, Watanabe, T, Nohara, M, Hanaguri, T, Takagi, H, Takano, Y, Kito, H, Itoh, J, Harima, H & Oguchi, T 2006, 'Anisotropic s-wave superconductors studied by angle-resolved photoemission spectroscopy', Journal of Physics and Chemistry of Solids, vol. 67, no. 1-3, pp. 277-281. https://doi.org/10.1016/j.jpcs.2005.10.125
Yokoya, Takayoshi ; Baba, T. ; Tsuda, S. ; Kiss, T. ; Chainani, A. ; Shin, S. ; Watanabe, T. ; Nohara, Minoru ; Hanaguri, T. ; Takagi, H. ; Takano, Y. ; Kito, H. ; Itoh, J. ; Harima, H. ; Oguchi, T. / Anisotropic s-wave superconductors studied by angle-resolved photoemission spectroscopy. In: Journal of Physics and Chemistry of Solids. 2006 ; Vol. 67, No. 1-3. pp. 277-281.
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AU - Yokoya, Takayoshi

AU - Baba, T.

AU - Tsuda, S.

AU - Kiss, T.

AU - Chainani, A.

AU - Shin, S.

AU - Watanabe, T.

AU - Nohara, Minoru

AU - Hanaguri, T.

AU - Takagi, H.

AU - Takano, Y.

AU - Kito, H.

AU - Itoh, J.

AU - Harima, H.

AU - Oguchi, T.

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AB - We review our angle-resolved photoemission spectroscopy (ARPES) results across superconducting transitions in 2H-NbSe2 and MgB2, and also show recent results on YNi2B2C. For 2H-NbSe 2 and MgB2, we observe that the superconducting gap exhibits clear Fermi surface (FS) sheet dependence for two types of FS sheets with different characters, thus providing evidence that the FS sheet dependence is a general feature for a superconductor having multiple FS sheets of different character. In YNi2B2C, we show experimental FSs, and momentum-dependent superconducting gap showing large anisotropy observed on a single FS. These ARPES results provide direct evidence for and importance of momentum-dependent superconducting gaps of phonon-mediated superconductors.

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