| Full text | |
| Author(s): |
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]
Total Authors: 10
|
| Affiliation: | [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
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW RESEARCH; v. 3, n. 3 JUL 2 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 17/10581-1 - Emergent phenomena in reduced dimension systems |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Special Projects |
| FAPESP's process: | 18/11364-7 - Magnetic properties of complex systems with non-trivial topology |
| Grantee: | Jean Carlo Souza |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 20/12283-0 - Scanning tunneling microscopy in topological nontrivial compounds |
| Grantee: | Jean Carlo Souza |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |