| Full text | |
| Author(s): |
Hinostroza, David
;
de Faria, Leandro Rodrigues
;
Cassemiro, Gustavo H.
;
Jimenez, J. Larrea
;
Machado, Antonio Jefferson da Silva
;
Brito, Walber H.
;
Martelli, Valentina
Total Authors: 7
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 109, n. 17, p. 10-pg., 2024-05-03. |
| Abstract | |
The bismuth halide Bi4I4 undergoes a structural transition around T-p similar to 300K, which separates a high-temperature beta phase (T > T-p) from a low-temperature beta phase (T<T-p). alpha and beta phases are suggested to host electronic band structures with distinct topological classifications. Rapid quenching was reported to stabilize a metastable beta-Bi4I4 at T < T-p, making possible a comparative study of the physical properties of the two phases in the same low-temperature range. In this work, we present a structural investigation of Bi4I4 before and after quenching together with electrical resistivity measurements. We found that rapid cooling does not consistently lead to a metastable beta-Bi4I4, and a quick transition to beta-Bi4I4 is observed. As a result, the comparison of putative signatures of different topologies attributed to a specific structural phase should be carefully considered. The observed phase instability is accompanied by an increase in iodine vacancies and by a change in the temperature dependence of electrical resistivity, pointing to native defects as a possible origin of our finding. Density functional theory (DFT) calculations support the scenario that iodine vacancies, together with bismuth antisites and interstitials are among the defects that are more likely to occur in Bi4I4 during the growth. (AU) | |
| FAPESP's process: | 21/08966-8 - Study of topological properties in new superconductors dichalcogenides which crystalizes in CdI2 prototype structure intercalated with rare earth. |
| Grantee: | Leandro Rodrigues de Faria |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 21/14322-6 - Investigation about the coexistence between magnetism, CDW instability and superconductivity in chalcogenides of transition metals |
| Grantee: | Antonio Jefferson da Silva Machado |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/19420-3 - Thermoelectricity and heat transport in topological materials |
| Grantee: | Valentina Martelli |
| Support Opportunities: | Research Grants - Young Investigators Grants |
| FAPESP's process: | 22/00992-2 - Investigation of the transport properties of the quasi-one-dimensional Bi4I4 |
| Grantee: | Cristhian David Hinostroza Vargas Machuca |
| Support Opportunities: | Scholarships in Brazil - Master |