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)

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• Anisotropic properties of the layered superconductor Cu0.07TiSe2
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• Iron pnictides as a new setting for quantum criticality
• 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
• Electronic and Magnetic Phase Diagram of a Superconductor, SmFeAsO1-xFx
• Orbital and spin effects for the upper critical field in As deficient disordered Fe pnictide superconductors
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• The Delicate Electronic and Magnetic Structure of the LaOFePn System (Pn = pnictogen)
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• Systematic Study on Fluorine-doping Dependence of Superconducting and Normal State Properties in LaFePO1-xFx
• The Phase Transition of Square Lattice Antiferromagnets at Finite Temperature
• Synthesis, Crystal Structure, and Thermoelectric Properties of Layered Antimony Selenides REOSbSe2 (RE = La, Ce)
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• Study of electron spin dynamics in grain aligned LaCoPO: an itinerant ferromagnet
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• Absence of strong magnetic fluctuations in the iron phosphide superconductors LaFePO and Sr2ScO3FeP
• Highly Correlated Electron State and High-Temperature Superconductivity in Iron Pnictides