| Full text | |
| Author(s): |
de Oliveira, Leonardo S.
[1]
;
Sabino, Fernando P.
[1]
;
de Florio, Daniel Z.
[1]
;
Janotti, Anderson
[2]
;
Dalpian, Gustavo M.
[1]
;
Souza, Jose A.
[1]
Total Authors: 6
|
| Affiliation: | [1] Fed Univ ABC, BR-09210580 Santo Andre, SP - Brazil
[2] Univ Delaware, Dept Mat Sci & Engn, Newark, DE 19716 - USA
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Journal of Physical Chemistry C; v. 124, n. 41, p. 22733-22742, OCT 15 2020. |
| Web of Science Citations: | 0 |
| Abstract | |
A comprehensive study on the correlations of structural, magnetic, and electronic properties of a new disordered Nd2CoFeO6 double perovskite has been conducted. The lack of A strong divergence of the magnetic susceptibility suggests competition between magnetic interactions at the magnetic phase transition T-N = 246 K, which is confirmed by the absence of a heat capacity peak. The magnetic susceptibility results indicate that the Fe/Co spins form a classical noninteracting paramagnetic state above T approximate to 2.2T(N), while deviations are found at intermediate temperatures indicating the presence of strong short-range magnetic interactions. AC and DC electrical resistivity results reveal a melting of insulating polaronic behavior to a metallic-like conductivity, establishing an electronic crossover closely related to both local magnetic moment and lattice-parameter evolution. We show from density functional calculations that the magnetic configurations have a strict relation to this crossover, being associated to a transition from low to high spin states of Co3+ ions. This insulator-metal transition has its origin driven by a local increase in the magnetic moment of Co3+ ions. Our results point to a scenario in which a continuous spin-state transition triggers a crossover between distinct electronic states from the insulating polaronic behavior to permanent metallic states. (AU) | |
| FAPESP's process: | 15/24999-2 - New ceramic compounds for protonic solid oxide fuel cells |
| Grantee: | Daniel Zanetti de Florio |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 18/15682-3 - Synthesis and Physical Properties Characterization of Micro/Nanostructured Semiconducting Materials |
| Grantee: | José Antonio Souza |
| Support Opportunities: | Regular Research Grants |
| FAPESP's process: | 17/02317-2 - Interfaces in materials: electronic, magnetic, structural and transport properties |
| Grantee: | Adalberto Fazzio |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 19/21656-8 - Big Data methods to tune perovskites to target properties: alloys, defects and doping |
| Grantee: | Fernando Pereira Sabino |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |