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Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe$ {1+y}$Te$ {1-x}$Se$ {x}$ revealed by magnetotransport measurements by Otsuka, Takumi; Hagisawa, Shotaro; Koshika, Yuta; Adachi, Shintaro; Usui, Tomohiro; Sasaki, Nae; Sasaki, Seya; Yamaguchi, Shunpei; Nakanishi, Yoshiki; Yoshizawa, Masahito; Kimura, Shojiro; Watanabe, Takao is a scholarly article available to read on EtoBox.

What is Incoherent-coherent crossover and the pseudogap in Te-annealed superconducting Fe$ {1+y}$Te$ {1-x}$Se$ {x}$ revealed by magnetotransport measurements about?

In this study, we conducted various magnetotransport measurements on Fe$_{1+y}$Te$_{1-x}$Se$_{x}$ single crystals from which excess iron was sufficiently removed. Our results revealed that crossover from the incoherent to the coherent electronic state and opening of the pseudogap occur at high temperatures ($\approx$ 150 K for $x$ = 0.2). This is accompanied by a more substantial pseudogap and the emergence of a phase with a multi-band nature at lower temperatures (below $\approx$ 50 K for $x$ = 0.2) before superconductivity sets in. A comparison of these results with those of the as-grown (non-superconducting) samples implies that the coherent state accompanied by the pseudogap is needed for the occurrence of superconductivity in this system.

Author

Otsuka, Takumi; Hagisawa, Shotaro; Koshika, Yuta; Adachi, Shintaro; Usui, Tomohiro; Sasaki, Nae; Sasaki, Seya; Yamaguchi, Shunpei; Nakanishi, Yoshiki; Yoshizawa, Masahito; Kimura, Shojiro; Watanabe, Takao

Published

2019

Language

EN