Large Temperature Dependence of the Number of Carriers in Co-Doped BaFe2As2

被引：62

作者：

Brouet, V. ^{[1
]}

Lin, Ping-Hui ^{[1
]}

Texier, Y. ^{[1
]}

Bobroff, J. ^{[1
]}

Taleb-Ibrahimi, A. ^{[2
]}

Le Fevre, P. ^{[2
]}

Bertran, F. ^{[2
]}

Casula, M. ^{[3
]}

Werner, P. ^{[4
]}

Biermann, S. ^{[5
]}

Rullier-Albenque, F. ^{[6
]}

Forget, A. ^{[6
]}

Colson, D. ^{[6
]}

机构：

[1] Univ Paris 11, Phys Solides Lab, UMR 8502, F-91405 Orsay, France

[2] Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France

[3] Univ Paris 06, CNRS, Inst Mineral & Phys Milieux Condenses, F-75252 Paris, France

[4] Univ Fribourg, Dept Phys, CH-1700 Fribourg, Switzerland

[5] Ecole Polytech, Ctr Phys Theor, UMR 7644, F-91128 Palaiseau, France

[6] CEA Saclay, CNRS URA 2464, Serv Phys Etat Condense, F-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 16期

关键词：

26;

D O I：

10.1103/PhysRevLett.110.167002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using angle-resolved photoemission spectroscopy, we study the evolution of the number of carriers in Ba(Fe1-xCox)(2)As-2 as a function of Co content and temperature. We show that there is a k-dependent energy shift compared to density functional calculations, which is large below 100 K at low Co contents and reduces the volume of hole and electron pockets by a factor 2. This k shift becomes negligible at high Co content and could be due to interband charge or spin fluctuations. We further reveal that the bands shift with temperature, changing significantly the number of carriers they contain (up to 50%). We explain this evolution by thermal excitations of carriers among the narrow bands, possibly combined with a temperature evolution of the k-dependent fluctuations. DOI: 10.1103/PhysRevLett.110.167002

引用

页数：5

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