Temperature-dependent pseudogap in the oxypnictides LaFeAsO1-xFx and LaFePO1-xFx seen via angle-integrated photoemission

被引：23

作者：

Ishida, Y. ^{[1
]}

Shimojima, T. ^{[2
]}

Ishizaka, K. ^{[2
,3
]}

Kiss, T. ^{[2
]}

Okawa, M. ^{[2
]}

Togashi, T. ^{[1
]}

Watanabe, S. ^{[2
]}

Wang, X. -Y. ^{[4
]}

Chen, C. -T. ^{[4
]}

Kamihara, Y. ^{[5
]}

Hirano, M. ^{[5
,6
]}

Hosono, H. ^{[5
,6
]}

Shin, S. ^{[1
,2
,3
]}

机构：

[1] RIKEN, SPring Ctr 8, Sayo, Hyogo 6795148, Japan

[2] Univ Tokyo, ISSP, Chiba 2778561, Japan

[3] Japan Sci & Technol Agcy, CREST, Tokyo 1020075, Japan

[4] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100080, Peoples R China

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

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

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 06期

关键词：

Fermi level; fluorine; iron compounds; lanthanum compounds; photoelectron spectra; superconducting energy gap; superconducting transition temperature; type II superconductors; LAYERED SUPERCONDUCTOR; 43; K; TRANSITION; GAP;

D O I：

10.1103/PhysRevB.79.060503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical-transition temperatures (T-c's) of 26 and 5 K, respectively. We find that high-T-c LaFeAsO:F exhibits a temperature-dependent pseudogaplike feature extending over similar to 0.1 eV about the Fermi level at 250 K, whereas such a feature is absent in low-T-c LaFePO:F. We also find similar to 20-meV pseudogaplike features and signatures of superconducting gaps in both LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogaplike features through comparison with the high-T-c cuprates.

引用

页数：4

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ESCHRIG H, ARXIV08040186

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