Physics – Condensed Matter – Superconductivity
Scientific paper
2009-02-17
Physical Review B 77, 155128 (2008)
Physics
Condensed Matter
Superconductivity
19 pages, 6 figures
Scientific paper
10.1103/PhysRevB.77.155128
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 hn = 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 ARPES experiments with hn = 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.
Bauer Eric D.
Borisenko S. V.
Buechner Bernd
Fink Joerg
Follath R.
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