| Full text | |
| Author(s): |
Souza, J. C.
;
Carlone, M.
;
Lesseux, G. G.
;
Pizzi, H. B.
;
Freitas, G. S.
;
Urbano, R. R.
;
Venegas, A.
;
Pagliuso, P. G.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 106, n. 23, p. 9-pg., 2022-12-07. |
| Abstract | |
The gap-opening mechanism of a topological insulator, the quantum anomalous Hall effect, and the axion physics are still pressing open questions, and a microscopic viewpoint to further understand the role of magnetism in topology is highly desirable. In this work we have performed a microscopic investigation, by means of electron spin resonance (ESR) along with complementary bulk measurements, on the chalcogenide (Bi1-xGdx)2Se3 (x = 0, 0.001, 0.002 and 0.006). Our analysis of the Gd3+ spin dynamics reveals no significant change of the Fermi surface as a function of Gd3+ concentration, which indicates that the 4 f magnetism is different from the nonlocal effects induced by transition metal (d electrons) substitutions. Additionally, we observe an unusual evolution of the Gd3+ ESR spectra as a function of the applied magnetic field, which we discuss considering the magnetic interaction between Gd3+ 4 f electrons and impurity centers such as Se vacancies. This interaction would give rise to a local weak antilocalization effect surrounding the Gd3+ ions. Such a mechanism is observable due to particular details of the Gd3+ 4 f electrons' magnetism in this system compared to that of d electrons. Our work points out that rare-earth substitutions in this model topological insulator are a promising path to explore the axion insulating systems. (AU) | |
| FAPESP's process: | 20/12283-0 - Scanning tunneling microscopy in topological nontrivial compounds |
| Grantee: | Jean Carlo Souza |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 22/09240-3 - High-resolution thermal expansion measurements in Ce and U-based intermetallic compounds |
| Grantee: | Gabriel Silva Freitas |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 12/04870-7 - Studies of novel complex and advanced materials |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/26247-9 - Emergent phenomena in Bi-based systems with low dimensionality |
| Grantee: | Gabriel Silva Freitas |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| 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 |