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Name (Title):
Shunsuke Tsuda (MANA Independent Scientist)
Affiliation:
International Center for Materials Nanoarchitectonics
(MANA), NIMS
Address:
1-1 Namiki, Tsukuba. Ibaraki 305-0044, Japan
Email: TSUDA.Shunsuke@nims.go.jp
Home Page:
Presentation Title:
Superconductivity of FeSe and related compounds
Abstract:
The discovery of the iron-based superconductors
stimulated huge number of researchers. After the first report
[1], more than 500 papers had been reported within this one
year. Many of them were focused on the exploration of new
materials with higher superconducting transition temperature
(Tc). Nowadays, those materials can be categorized into four
groups from structural point of view. FeSe has the simplest
structure among the iron-based superconductors. This fact
implies the advantage for studying the essential feature of
the iron-based superconductors.
We have synthesized FeSe and related compounds. [2~4]
Figure 1 shows substitution dependence of the Tc. Chemical
substitution of Te for Se site enhanced the superconductivity
up to 0.8 and the superconductivity disappeared after further
substitution suddenly.
We performed photoemission study on FeSe. As is shown
in fig. 2, photoemission intensity around Fermi level
decrease with decreasing temperature.
The collaborators in this work are Y. Mizuguchi, F.
Tomioka, T. Yamaguchi, Y. Takano in NIMS and M. Okawa,
K. Ishizaka, .S. Shin in ISSP, Univ. of Tokyo.
References:
[1] Y. Kamihara, T. Watanabe, M. Hirano, H. Hosono, JACS 130 (2008).
[2] Y. Mizuguchi, F. Tomioka, S. Tsuda, T. Yamaguchi, Y. Takano, APL 93 152505 (2008).
[3] Y. Mizuguchi, F. Tomioka, S. Tsuda, T. Yamaguchi, Y. Takano, APL 94 012503 (2009).
[4] Y. Mizuguchi, F. Tomioka, S. Tsuda, T. Yamaguchi, Y. Takano, cond-mat080.1123.
112
Poster Session PIS-4
Fig. 1 Substitution dependence of Tc of
FeSe1-xTex[4]
Fig. 2 Symmetrized photoemission
spectra of FeSe