"Universal" $Δ_{max}/T_c$ in Fe Based Superconductors
Fuente:
arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866914892178522112 |
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| author | Panda, Siddhant Hirschfeld, P. J. |
| author_facet | Panda, Siddhant Hirschfeld, P. J. |
| contents | Iron-based superconductors display a large degree of variability in electronic structure at the Fermi surface, resulting in superconducting gap structures,$T_c$'s, and other properties that vary considerably from family to family. Recently it was noted that across many different families of Fe-based systems, the ratio $Δ_{max}/T_c$ is found to be quasi-universal with a large value of ~3.5 compared to the the one-band BCS weak-coupling result of 1.76. Here $Δ_{max}$ is the measured maximum gap across the Fermi surface. This remarkable fact was attributed to strong-coupling effects arising from Hund's metal physics. Here we perform a "high-throughput" scan across band masses, Fermi energies, and interaction parameters in a weak-coupling Suhl-Matthias-Walker model. We find that unexpectedly large values of $Δ_{max}/T_c$ can be achieved within weak coupling, and that quasiuniversal behavior similar to experiment emerges for those systems where interband interactions dominate intraband ones. However, within the current framework, a large mass contrast between bands is required. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_05512 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | "Universal" $Δ_{max}/T_c$ in Fe Based Superconductors Panda, Siddhant Hirschfeld, P. J. Superconductivity Iron-based superconductors display a large degree of variability in electronic structure at the Fermi surface, resulting in superconducting gap structures,$T_c$'s, and other properties that vary considerably from family to family. Recently it was noted that across many different families of Fe-based systems, the ratio $Δ_{max}/T_c$ is found to be quasi-universal with a large value of ~3.5 compared to the the one-band BCS weak-coupling result of 1.76. Here $Δ_{max}$ is the measured maximum gap across the Fermi surface. This remarkable fact was attributed to strong-coupling effects arising from Hund's metal physics. Here we perform a "high-throughput" scan across band masses, Fermi energies, and interaction parameters in a weak-coupling Suhl-Matthias-Walker model. We find that unexpectedly large values of $Δ_{max}/T_c$ can be achieved within weak coupling, and that quasiuniversal behavior similar to experiment emerges for those systems where interband interactions dominate intraband ones. However, within the current framework, a large mass contrast between bands is required. |
| title | "Universal" $Δ_{max}/T_c$ in Fe Based Superconductors |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2306.05512 |