Superconductivity and phonon self-energy effects in Fe$_{1+y}$Te$_{0.6}$Se$_{0.4}$

We study Fe $_{1 + y}$ Te $_{0.6}$ Se $_{0.4}$ multi-band superconductor with $T_{c} = 14$ K by polarization-resolved Raman spectroscopy. Deep in the superconducting state, we detect pair-breaking excitation at 45cm $^{- 1}$ ( $2 Δ = 5.6$ meV) in the $X Y$ ( $B_{2 g}$ ) scattering geometry, consistent with twice of the superconducting gap energy (3 meV) revealed by ARPES on the hole-like Fermi pocket with $d_{x z} / d_{y z}$ character. We analyze the superconductivity induced phonon self-energy effects for the $B_{1 g}$ (Fe) phonon and estimate the electron-phonon coupling constant $\lambda^\Gamma \approx 0.026 $, w h i c h i s i n s u f f i c i e n t t o e x p l a i n s u p e r c o n d u c t i v i t y w i t h$ T_c=14$K.

Superconductivity and phonon self-energy effects in Fe $_{1 + y}$ Te $_{0.6}$ Se $_{0.4}$

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Superconductivity and phonon self-energy effects in Fe $_{1 + y}$ Te $_{0.6}$ Se $_{0.4}$

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Superconductivity and phonon self-energy effects in Fe1+y1+y​Te0.60.6​Se0.40.4​

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Superconductivity and phonon self-energy effects in Fe1+y1+y​Te0.60.6​Se0.40.4​

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Superconductivity and phonon self-energy effects in Fe $_{1 + y}$ Te $_{0.6}$ Se $_{0.4}$

讲解博客

AI智能校验

Superconductivity and phonon self-energy effects in Fe $_{1 + y}$ Te $_{0.6}$ Se $_{0.4}$

讲解博客

AI智能校验