Uncollapsed LaFe2As2 phase: Compensated, highly doped, electron-phonon-coupled, iron-based superconductor
Ilaria Pallecchi, Akira Iyo, Hiraku Ogino, Marco Affronte, Marina Putti
DOI 10.1103/PhysRevMaterials.4.114803 · Physical Review Materials
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Abstract
The recently discovered LaFe2As2 superconducting compound, member of the 122 family of iron pnictide superconductors, becomes superconducting below Tc≈13K, yet its nominal doping apparently places it in the extreme overdoped limit, where superconductivity should be suppressed. In this work, we investigate the normal state of magneto- and thermoelectric transport and specific heat of this compound. The experimental data are consistent with the presence of highly compensated electron and hole bands, with ∼0.42 electrons per unit cell just above Tc, and high effective masses ∼3m0. The temperature dependence of transport properties strongly resembles that of conventional superconductors, pointing to a key role of electron-phonon coupling. From this evidence, LaFe2As2 can be regarded as the connecting compound between unconventional and conventional superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.1 | Pressure not reported | onset |
| LaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | onset |
| (La0.5-xNa0.5+x)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.4 | Pressure not reported | unknown |
| (La0.5-xNa0.5+x)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | unknown |
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