Superconductivity and phonon self-energy effects in Fe_{1+y}Te_{0.6}Se_{0.4}
We study a Fe_{1+y}Te_{0.6}Se_{0.4} multiband superconductor with T_{c}=14K by polarization-resolved Raman spectroscopy. Deep in the superconducting state, we detect pair-breaking excitation at 2Δ=5.6meV in the XY(B_{2g}) scattering geometry, consistent with the fundamental gap energy Δ=3meV reveale...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-03-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.013373 |
| Summary: | We study a Fe_{1+y}Te_{0.6}Se_{0.4} multiband superconductor with T_{c}=14K by polarization-resolved Raman spectroscopy. Deep in the superconducting state, we detect pair-breaking excitation at 2Δ=5.6meV in the XY(B_{2g}) scattering geometry, consistent with the fundamental gap energy Δ=3meV revealed by ARPES on the holelike Fermi pocket with d_{xz}/d_{yz} character. We analyze the superconductivity-induced phonon self-energy effects for the B_{1g}(Fe) phonon mode and derive the electron-phonon coupling constant λ^{Γ}≈0.026, which is insufficient to explain superconductivity with T_{c}=14K. |
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| ISSN: | 2643-1564 |