Optical investigations of chemically pressurizedEuFe2(As1−xPx)2: Ans-wave superconductor with strong interband interactions
| Autor: | D. Wu, Hirale S. Jeevan, Philipp Gegenwart, Martin Dressel, G. Chanda |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
Superconductivity
Physics Condensed matter physics Infrared spectroscopy Fermi surface Electronic structure Electron BCS theory Condensed Matter Physics Coupling (probability) 01 natural sciences Optical conductivity 010305 fluids & plasmas Electronic Optical and Magnetic Materials Condensed Matter::Superconductivity 0103 physical sciences 010306 general physics |
| Zdroj: | Physical Review B. 83 |
| ISSN: | 1550-235X 1098-0121 |
| DOI: | 10.1103/physrevb.83.100503 |
| Popis: | Superconducting ${\mathrm{EuFe}}_{2}$(${\mathrm{As}}_{0.82}{\mathrm{P}}_{0.18}$)${}_{2}$ single crystals are investigated by broad-band infrared spectroscopy. Below ${T}_{c}=28$ K, a superconducting gap forms at $2{\ensuremath{\Delta}}_{0}=9.5 \mathrm{meV}=3.7{k}_{B}{T}_{c}$, causing the reflectivity to sharply rise to unity at low frequency. In the range of the gap, the optical conductivity can be perfectly described by BCS theory with an $s$-wave gap and no nodes. From our analysis of the temperature-dependent conductivity and spectral weight at $Tg{T}_{c}$, we deduce an increased interband coupling between hole and electron sheets on the Fermi surface when $T$ approaches ${T}_{c}$. |
| Databáze: | OpenAIRE |
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