تقرير
Photoemission signature of momentum-dependent hybridization in CeCoIn$_5$
| العنوان: | Photoemission signature of momentum-dependent hybridization in CeCoIn$_5$ |
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| المؤلفون: | Kurleto, R., Fidrysiak, M., Nicolaï, L., Minár, J., Rosmus, M., Walczak, Ł., Tejeda, A., Rault, J. E., Bertran, F., Kądzielawa, A. P., Legut, D., Gnida, D., Kaczorowski, D., Kissner, K., Reinert, F., Spałek, J., Starowicz, P. |
| المصدر: | Phys. Rev. B 104, 125104 (2021) |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Hybridization between $f$ electrons and conduction bands ($c$-$f$ hybridization) is a driving force for many unusual phenomena. To provide insight into it, systematic studies of CeCoIn$_5$ heavy fermion superconductor have been performed by angle-resolved photoemission spectroscopy (ARPES) in a large angular range at temperature of $T=6$ K. The used photon energy of 122 eV corresponds to Ce $4d$-$4f$ resonance. Calculations carried out with relativistic multiple scattering Korringa-Kohn-Rostoker method and one-step model of photoemission yielded realistic simulation of the ARPES spectra indicating that Ce-In surface termination prevails. Surface states, which have been identified in the calculations, contribute significantly to the spectra. Effects of the hybridization strongly depend on wave vector. They include a dispersion of heavy electrons and bands gaining $f$-electron character when approaching Fermi energy. We have also observed a considerable variation of $f$-electron spectral weight at $E_F$, which is normally determined by both matrix element effects and wave vector dependent $c$-$f$ hybridization. Fermi surface scans covering a few Brillouin zones revealed large matrix element effects. A symmetrization of experimental Fermi surface, which reduces matrix element contribution, yielded a specific variation of $4f$-electron enhanced spectral intensity at $E_F$ around $\bar{\Gamma}$ and $\bar{M}$ points. Tight-binding approximation calculations for Ce-In plane provided the same universal distribution of $4f$-electron density for a range of values of the parameters used in the model. Comment: 15 pages, 9 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.104.125104 |
| URL الوصول: | http://arxiv.org/abs/2101.05761 |
| رقم الأكسشن: | edsarx.2101.05761 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.104.125104 |
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