How Kondo-holes create intense nanoscale heavy-fermion hybridization disorder
| Autor: | Yonatan Dubi, Travis Williams, Milan P. Allan, Phelim Bradley, Mohammad Hamidian, Alexander V. Balatsky, J. C. Davis, J. D. Garrett, Ines Firmo, A. Schmidt, Graeme Luke |
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| Rok vydání: | 2011 |
| Předmět: |
Condensed Matter::Quantum Gases
Physics Multidisciplinary Strongly Correlated Electrons (cond-mat.str-el) Condensed matter physics Doping FOS: Physical sciences Electron Electronic structure Thermal conduction Condensed Matter - Strongly Correlated Electrons Quantum state Commentaries Physical Sciences Atom Bound state Condensed Matter::Strongly Correlated Electrons Randomness |
| Zdroj: | Proceedings of the National Academy of Sciences. 108:18233-18237 |
| ISSN: | 1091-6490 0027-8424 |
| DOI: | 10.1073/pnas.1115027108 |
| Popis: | Replacing a magnetic atom by a spinless atom in a heavy fermion compound generates a quantum state often referred to as a 'Kondo-hole'. No experimental imaging has been achieved of the atomic-scale electronic structure of a Kondo-hole, or of their destructive impact (Lawrence JM, et al. (1996) Kondo hole behavior in Ce0. 97La0. 03Pd3. Phys Rev B 53:12559-12562; Bauer ED, et al. (2011) Electronic inhomogeneity in a Kondo lattice. Proc Natl Acad Sci. 108:6857-6861) on the hybridization process between conduction and localized electrons which generates the heavy fermion state. Here we report visualization of the electronic structure at Kondo-holes created by substituting spinless Thorium atoms for magnetic Uranium atoms in the heavy-fermion system URu2Si2. At each Thorium atom, an electronic bound state is observed. Moreover, surrounding each Thorium atom we find the unusual modulations of hybridization strength recently predicted to occur at Kondo-holes (Figgins J, Morr DK (2011) Defects in heavy-fermion materials: unveiling strong correlations in real space. Phys Rev Lett 107:066401). Then, by introducing the 'hybridization gapmap' technique to heavy fermion studies, we discover intense nanoscale heterogeneity of hybridization due to a combination of the randomness of Kondo-hole sites and the long-range nature of the hybridization oscillations. These observations provide direct insight into both the microscopic processes of heavy-fermion forming hybridization and the macroscopic effects of Kondo-hole doping. Main Article + Figures, Supporting Information + Figures; PNAS 2011 |
| Databáze: | OpenAIRE |
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