Electromagnetic properties and electronic structure of iron-based layered superconductor LaOFeP

Abstract

Structural, electronic, and magnetic properties of undoped and aliovalent-ion (Ca, F)-doped LaOFeP, which undergo superconducting transitions at transition temperatures (Tc) 4-7 K [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. LaOFeP exhibits paramagnetism in the normal conducting state. Photoemission spectroscopy combined with first-principle band calculations clarified that 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 LaOFeP is basically in the low-spin configuration, and that the spin moment of LaOFeP is almost quenched, leading to the paramagnetism of the itinerant electrons.

22 pages, 13 figures. Physical Review B (accepted)

References in corpus (8)

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• Critical Fields and Anisotropy of NdO0.82F0.18FeAs Single Crystals
• Electronic Structure of Fe-Based Superconductors
• Intrinsic Properties of Stoichiometric LaOFeP
• Evidence for Strong Itinerant Spin Fluctuations in the Normal State of CeFeAsO(0.89)F(0.11) Iron-Oxypnictides
• The Delicate Electronic and Magnetic Structure of the LaOFePn System (Pn = pnictogen)
• X-ray spectra and electronic structure of FeAs superconductors
• Spin Dynamics in Iron-based Layered Superconductor (La_{0.87}Ca_{0.13})FePO Revealed by ^{31}P and ^{139}La NMR Studies
• Strength of correlations in pnictides and its assessment by theoretical calculations and spectroscopy experiments
• Superconductivity in LnFePO (Ln = La, Pr, and Nd) single crystals
• Possible unconventional superconductivity in iron-based layered compound LaFePO: Study of heat capacity
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• Striped antiferromagnetism and electronic structures of SrFeAsF and their implications
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