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

Research output: Contribution to journalArticle

64 Citations (Scopus)

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, 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 Fe3d (dz2 + (dxz, dyz)) orbitals hybridized with P3p 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.

Original languageEnglish
Article number214515
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume77
Issue number21
DOIs
Publication statusPublished - 2008 Jun 18
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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