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| Home > Articles > Published articles > Influence of 4f filling on electronic and magnetic properties of rare earth-Au surface compounds |
(Universidad del País Vasco. Departamento de Física Aplicada) (Universidad del País Vasco. Departamento de Polímeros y Materiales Avanzados) (Donostia International Physics Center) (Consejo Superior de Investigaciones Científicas (Espanya). Centro de Física de Materiales) (Consejo Superior de Investigaciones Científicas (Espanya). Centro de Física de Materiales) (Universidad del País Vasco. Departamento de Física Aplicada) (ALBA Laboratori de Llum de Sincrotró) (Institut Català de Nanociència i Nanotecnologia) (Institut Català de Nanociència i Nanotecnologia) (Consiglio Nazionale Delle Ricerche. Istituto di Struttura della Materia) (Consiglio Nazionale Delle Ricerche. Istituto di Struttura della Materia) (Consiglio Nazionale Delle Ricerche. Istituto di Struttura della Materia) (Consiglio Nazionale Delle Ricerche. Istituto di Struttura della Materia) (Universidad del País Vasco. Departamento de Física Aplicada) (Donostia International Physics Center)
| Date: | 2020 |
| Abstract: | One-atom-thick rare-earth/noble metal (RE-NM) compounds are attractive materials to investigate two-dimensional magnetism, since they are easy to synthesize into a common RE-NM2 structure with high crystal perfection. Here we perform a comparative study of the GdAu2, HoAu2, and YbAu2 monolayer compounds grown on Au(111). We find the same atomic lattice quality and moiré superlattice periodicity in the three cases, but different electronic properties and magnetism. The YbAu2 monolayer reveals the characteristic electronic signatures of a mixed-valence configuration in the Yb atom. In contrast, GdAu2 and HoAu2 show the trivalent character of the rare-earth and ferromagnetic transitions below 22 K. Yet, the GdAu2 monolayer has an in-plane magnetic easy-axis, versus the out-of-plane one in HoAu2. The electronic bands of the two trivalent compounds are very similar, while the divalent YbAu2 monolayer exhibits different band features. In the latter, a strong 4f-5d hybridization is manifested in neatly resolved avoided crossings near the Fermi level. First principles theory points to a residual presence of empty 4f states, explaining the fluctuating valence of Yb in the YbAu2 monolayer. |
| Grants: | European Commission 797109 Agencia Estatal de Investigación PID2019-107338RB-C65 Ministerio de Economía y Competitividad PGC2018-098613-B-C21 Ministerio de Economía y Competitividad MAT-2017-88374-P Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Economía y Competitividad MAT2016-78293-C6 Ministerio de Economía y Competitividad FIS2016-75862-P Ministerio de Economía y Competitividad SEV-2016-0686 |
| Note: | Altres ajuts: This work was supported in part by the Basque Government Project IT-1255-19, and University of the Basque Country (UPV/EHU) grant GIU18/138 and the European Regional Development Fund (ERDF) under the program Interreg V-A España-Francia-Andorra (Contract No. EFA 194/16 TNSI). |
| Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.  |
| Language: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Subject: | Comparative studies ; Crystal perfection ; Electronic and magnetic properties ; Electronic signatures ; Ferromagnetic transitions ; First-principles theory ; Superlattice periodicity ; Trivalent compounds |
| Published in: | Nanoscale, Vol. 12, issue 43 (Nov. 2020) , p. 22258-22267, ISSN 2040-3372 |
