Iron-specific phonon density of states in the superconductors LaFeAsO1−xFx and La1−xCaxFePO
Satoshi Higashitaniguchi, Makoto Seto, Shinji Kitao, Yasuhiro Kobayashi, Makina Saito, Ryo Masuda, Takaya Mitsui, Yoshitaka Yoda, Yoichi Kamihara, Masahiro Hirano, Hideo Hosono
DOI 10.1103/PhysRevB.78.174507 · Physical Review B
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Abstract
We measured element-specific Fe-phonon densities of states (Fe-PDOSs) of LaFeAsO1−xFx (x=0,0.11) and La1−xCaxFePO (x=0.13) by nuclear resonant inelastic scattering of synchrotron radiation. Since the bands crossing the Fermi edge are mainly Fe 3d bands, Fe is the key element for iron pnictide superconductivity, and therefore element-specific Fe-PDOS offers crucial information on the phonon contribution in iron pnictide superconductors. The measured Fe-PDOSs of superconductor LaFeAsO0.89F0.11 (Tc=26 K) and that of nonsuperconductor LaFeAsO have similar structures both below Tc (15 K) and above Tc (298 K); therefore, fluorine doping does not have a notable effect on the Fe-PDOS. The measured Fe-PDOS of LaFeAsO1−xFx agrees well with Fe-PDOS spectrum determined from a previous first-principles calculation and shows structural resemblance with a calculated Éliashberg function α2F(ω), which indicates small electron-phonon coupling. Therefore, our results indicate that phonons are not the main contributors to the high-Tc superconductivity of LaFeAsO1−xFx.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO0.89F0.11 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| La0.87Ca0.13FePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.4 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.5 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.8 | Pressure not reported | unknown |
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