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 |
| _version_ | 1797211467519361024 |
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| author | S.-F. Wu A. Almoalem I. Feldman A. Lee A. Kanigel G. Blumberg |
| author_facet | S.-F. Wu A. Almoalem I. Feldman A. Lee A. Kanigel G. Blumberg |
| author_sort | S.-F. Wu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-24T10:26:57Z |
| format | Article |
| id | doaj.art-56d920eb6d614afbaf7c6cf04056637c |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:26:57Z |
| publishDate | 2020-03-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-56d920eb6d614afbaf7c6cf04056637c2024-04-12T16:52:05ZengAmerican Physical SocietyPhysical Review Research2643-15642020-03-012101337310.1103/PhysRevResearch.2.013373Superconductivity and phonon self-energy effects in Fe_{1+y}Te_{0.6}Se_{0.4}S.-F. WuA. AlmoalemI. FeldmanA. LeeA. KanigelG. BlumbergWe 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.http://doi.org/10.1103/PhysRevResearch.2.013373 |
| spellingShingle | S.-F. Wu A. Almoalem I. Feldman A. Lee A. Kanigel G. Blumberg Superconductivity and phonon self-energy effects in Fe_{1+y}Te_{0.6}Se_{0.4} Physical Review Research |
| title | Superconductivity and phonon self-energy effects in Fe_{1+y}Te_{0.6}Se_{0.4} |
| title_full | Superconductivity and phonon self-energy effects in Fe_{1+y}Te_{0.6}Se_{0.4} |
| title_fullStr | Superconductivity and phonon self-energy effects in Fe_{1+y}Te_{0.6}Se_{0.4} |
| title_full_unstemmed | Superconductivity and phonon self-energy effects in Fe_{1+y}Te_{0.6}Se_{0.4} |
| title_short | Superconductivity and phonon self-energy effects in Fe_{1+y}Te_{0.6}Se_{0.4} |
| title_sort | superconductivity and phonon self energy effects in fe 1 y te 0 6 se 0 4 |
| url | http://doi.org/10.1103/PhysRevResearch.2.013373 |
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