Electromagnetic properties and electronic structure of the iron-based layered superconductor LaFePO
Yoichi Kamihara, Masahiro Hirano, Hiroshi Yanagi, Toshio Kamiya, Yuji Saitoh, Eiji Ikenaga, Keisuke Kobayashi, Hideo Hosono
DOI 10.1103/PhysRevB.77.214515 · Physical Review B
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Abstract
Structural, electronic, and magnetic properties of undoped and aliovalent-ion (Ca, F)-doped LaFePO, which undergo superconducting transitions at transition temperatures (Tc) 4–7 K [Y. Kamihara et al., J. Am. Chem. Soc. 128, 10012 (2006)], were investigated. Tc of the samples varied from 2.4 to 5.5 K in the undoped samples and was increased up to ∼7 K by Ca and F doping. The Tc increases are correlated with a decrease in the lattice volume. LaFePO exhibits paramagnetism in the normal conducting state. Photoemission spectroscopy combined with first-principle band calculations clarified that Fe Fe 3d (dz2+(dxz,dyz)) orbitals hybridized with P 3p to form a Fermi surface. The band calculations also suggest that the 3d electron of the Fe in LaFePO is basically in the low-spin configuration, and that the spin moment of LaFePO is almost quenched, leading to the paramagnetism of the itinerant electrons.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | midpoint |
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4 | Pressure not reported | unknown |
| LaFeP(O0.94F0.06) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | midpoint |
| (La0.9Ca0.1)FePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | midpoint |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
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