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

被引：64

作者：

Kamihara, Yoichi ^{[1
]}

Hirano, Masahiro ^{[1
]}

Yanagi, Hiroshi ^{[2
]}

Kamiya, Toshio ^{[1
,2
]}

Saitoh, Yuji

Ikenaga, Eiji

Kobayashi, Keisuke

Hosono, Hideo ^{[1
,2
]}

机构：

[1] Tokyo Inst Technol, Frontier Res Ctr, ERATO SORST, JST,Midori Ku, Yokohama, Kanagawa 2268503, Japan

[2] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.77.214515

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Structural, electronic, and magnetic properties of undoped and aliovalent-ion (Ca, F)-doped LaFePO, which undergo superconducting transitions at transition temperatures (T-c) 4-7 K [Y. Kamihara , J. Am. Chem. Soc. 128, 10012 (2006)], were investigated. T-c of the samples varied from 2.4 to 5.5 K in the undoped samples and was increased up to similar to 7 K by Ca and F doping. The T-c 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 (d(z2)+(d(xz),d(yz))) 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.

引用

页数：9

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