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

63 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

Fingerprint

Paramagnetism
paramagnetism
electromagnetic properties
Superconducting materials
Electronic structure
Iron
electronic structure
iron
Fermi surface
Electrons
Photoelectron spectroscopy
Electronic properties
Superconducting transition temperature
Fermi surfaces
Structural properties
Magnetic properties
electrons
photoelectric emission
transition temperature
Doping (additives)

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electromagnetic properties and electronic structure of the iron-based layered superconductor LaFePO. / Kamihara, Yoichi; Hirano, Masahiro; Yanagi, Hiroshi; Kamiya, Toshio; Saitoh, Yuji; Ikenaga, Eiji; Kobayashi, Keisuke; Hosono, Hideo.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 77, No. 21, 214515, 18.06.2008.

Research output: Contribution to journalArticle

Kamihara, Yoichi ; Hirano, Masahiro ; Yanagi, Hiroshi ; Kamiya, Toshio ; Saitoh, Yuji ; Ikenaga, Eiji ; Kobayashi, Keisuke ; Hosono, Hideo. / Electromagnetic properties and electronic structure of the iron-based layered superconductor LaFePO. In: Physical Review B - Condensed Matter and Materials Physics. 2008 ; Vol. 77, No. 21.
@article{3e529dd6e04f40348faccbda20055065,
title = "Electromagnetic properties and electronic structure of the iron-based layered superconductor LaFePO",
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.",
author = "Yoichi Kamihara and Masahiro Hirano and Hiroshi Yanagi and Toshio Kamiya and Yuji Saitoh and Eiji Ikenaga and Keisuke Kobayashi and Hideo Hosono",
year = "2008",
month = "6",
day = "18",
doi = "10.1103/PhysRevB.77.214515",
language = "English",
volume = "77",
journal = "Physical Review B-Condensed Matter",
issn = "1098-0121",
publisher = "American Physical Society",
number = "21",

}

TY - JOUR

T1 - Electromagnetic properties and electronic structure of the iron-based layered superconductor LaFePO

AU - Kamihara, Yoichi

AU - Hirano, Masahiro

AU - Yanagi, Hiroshi

AU - Kamiya, Toshio

AU - Saitoh, Yuji

AU - Ikenaga, Eiji

AU - Kobayashi, Keisuke

AU - Hosono, Hideo

PY - 2008/6/18

Y1 - 2008/6/18

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=45749156029&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=45749156029&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.77.214515

DO - 10.1103/PhysRevB.77.214515

M3 - Article

AN - SCOPUS:45749156029

VL - 77

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 21

M1 - 214515

ER -