| Texto completo | |
| Autor(es): |
Souza, J. C.
[1, 2]
;
Koenig, M.
[2]
;
Crivillero, M. V. Ale
[2]
;
Malcolms, M. O.
[1]
;
Urbano, R. R.
[1]
;
Fisk, Z.
[3]
;
Rosa, P. F. S.
[4]
;
Pagliuso, P. G.
[1]
;
Wirth, S.
[2]
;
Sichelschmidt, J.
[2]
Número total de Autores: 10
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP - Brazil
[2] Max Planck Inst Chem Phys Solids, D-01187 Dresden - Germany
[3] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 - USA
[4] Los Alamos Natl Lab, Los Alamos, NM 87545 - USA
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW RESEARCH; v. 3, n. 3 JUL 2 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
The interplay between nontrivial topological states of matter and strong electronic correlations is one of the most compelling open questions in condensed matter physics. Due to experimental challenges, there is an increasing desire to find more microscopic techniques to complement the results of more traditional experiments. In this work, we locally explore the Kondo insulator Sm1-xGdxB6 by means of electron spin resonance (ESR) of Gd3+ ions at low temperatures. Our analysis reveals that the Gd3+ ESR line shape shows an anomalous evolution as a function of temperature, wherein for highly dilute samples (x approximate to 0.0002) the Gd3+ ESR line shape changes from a localized ESR local moment character to a diffusive-like character. Upon manipulating the sample surface with a focused ion beam we demonstrate, in combination with electrical resistivity measurements, that the localized character of the Gd3+ ESR line shape is recovered by increasing the penetration of the microwave in the sample. This provides compelling evidence for the contribution of surface or near-surface excitations to the relaxation mechanism in the Gd3+ spin dynamics. Our work brings new insights into the importance of nontrivial surface excitations in ESR, opening new routes to be explored both theoretically and experimentally. (AU) | |
| Processo FAPESP: | 17/10581-1 - Fenômenos emergentes em sistemas de dimensões reduzidas |
| Beneficiário: | Pascoal Jose Giglio Pagliuso |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |
| Processo FAPESP: | 18/11364-7 - Propriedades magnéticas de sistemas complexos com topologia não-trivial |
| Beneficiário: | Jean Carlo Souza |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 20/12283-0 - Microscopia de varredura de tunelamento em compostos com topologia não-trivial |
| Beneficiário: | Jean Carlo Souza |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Doutorado |