Hybridization effects in CeCoIn5 observed by angle-resolved photoemission

被引：45

作者：

Koitzsch, A. ^{[1
,2
]}

Borisenko, S. V. ^{[1
]}

Inosov, D. ^{[1
]}

Geck, J. ^{[1
]}

Zabolotnyy, V. B. ^{[1
]}

Shiozawa, H. ^{[1
]}

Knupfer, M. ^{[1
]}

Fink, J. ^{[1
,3
]}

Buechner, B. ^{[1
]}

Bauer, E. D. ^{[4
]}

Sarrao, J. L. ^{[4
]}

Follath, R. ^{[3
]}

机构：

[1] IFW Dresden, D-01171 Dresden, Germany

[2] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany

[3] BESSY, D-12489 Berlin, Germany

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 15期

关键词：

D O I：

10.1103/PhysRevB.77.155128

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the low-energy electronic structure of the heavy fermion superconductor CeCoIn5 by angle-resolved photoemission. We focus on the dispersion and the peak width of the prominent quasi-two-dimensional Fermi surface sheet at the corner of the Brillouin zone as a function of temperature along certain k directions with a photon energy of h nu=100 eV. We find slight changes of the Fermi vector and an anomalous broadening of the peak width when the Fermi energy is approached. Additionally, we performed resonant angle-resolved photoemission spectroscopy experiments with h nu=121 eV. A flat f-derived band is observed with a distinct temperature dependence and a k-dependent spectral weight. These results, including both off- and on-resonant measurements, fit qualitatively to a two-level mixing model derived from the periodic Anderson model.

引用

页数：7

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