تقرير
Strong spin dependence of correlation effects in Ni due to Stoner excitations
| العنوان: | Strong spin dependence of correlation effects in Ni due to Stoner excitations |
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| المؤلفون: | Sánchez-Barriga, J., Ovsyannikov, R., Fink, J. |
| المصدر: | Phys. Rev. Lett. 121, 267201 (2018) |
| سنة النشر: | 2018 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | Using high-resolution angle-resolved photoemission, we observe a strong spin-dependent renormalization and lifetime broadening of the quasiparticle excitations in the electronic band structure of Ni(111) in an energy window of $\sim$0.3 eV below the Fermi level. We derive a quantitative result for the spin-dependent lifetime broadening by comparing the scattering rates of majority and minority $d$ states, and further show that spin-dependent electron correlations are instead negligible for $sp$ states. From our analysis we experimentally determine the effective on-site Coulomb interaction $U$ caused by Stoner-like interband transitions between majority and minority $d$ states. The present results unambiguously demonstrate the remarkable impact of spin-dependent electron correlation effects originating from single-particle excitations in a prototypical 3$d$ transition metal, paving the way for further refinement of current many-body theoretical approaches. Comment: 5 pages, 4 figures, submitted on 24.05.2018 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.121.267201 |
| URL الوصول: | http://arxiv.org/abs/1805.09645 |
| رقم الأكسشن: | edsarx.1805.09645 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.121.267201 |
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