| Full text | |
| Author(s): |
Sergeenkov, S.
[1, 2]
;
Cordova, C.
[1]
;
Cichetto, Jr., L.
[3, 1, 4]
;
de Lima, O. F.
[5]
;
Longo, E.
[3, 4]
;
Araujo-Moreira, F. M.
[1]
Total Authors: 6
|
| Affiliation: | [1] Univ Fed Sao Carlos, Dept Phys, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Fed Paraiba, CCEN, Dept Phys, BR-58051970 Joao Pessoa, PB - Brazil
[3] Univ Fed Sao Carlos, Dept Chem, LIEC, BR-13565905 Sao Carlos, SP - Brazil
[4] Univ Estadual Paulista, UNESP, Inst Chem, BR-14801907 Araraquara, SP - Brazil
[5] Univ Estadual Campinas, Inst Phys Gleb Wataghin, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | Journal of Alloys and Compounds; v. 667, p. 18-22, MAY 15 2016. |
| Web of Science Citations: | 2 |
| Abstract | |
We study the transport properties of C1-xCox thin films (with x = 0.1, 0.15 and 0.2) grown on Si substrate by pulsed laser deposition technique. The results demonstrate some anomalous effects in the behavior of the measured resistance R(T,x). More specifically, for 0 < T< T{*} range (with T{*} similar or equal to 220 K) the resistance is shown to be well fitted by a small polaron hopping scenario with R-h(T,x) proportional to exp[{[}T-0(x)/T](0.5)] and a characteristic temperature T-0(x) similar or equal to T-0(0)(1 - x) (with T-0(0) = 120 K). While for higher temperatures T{*} <T < T-C(x), the resistance is found to be linearly dependent on spontaneous magnetization M(T,x), viz. R-M(T,x)proportional to M(T,x), following the pattern dictated by electron scattering on cobalt atoms formed robust ferromagnetic structure with the Curie temperature T-C(x) obeying a percolation like law T-C(x)similar or equal to T-C(x(m))(x/x(m))(0.15) with T-C(x(m)) = 295 K and the maximum zero-temperature magnetization reaching M(0, x(m))=0.5 mu(B) per Co atom for x(m) = 0.2. (c) 2016 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 14/01371-5 - Obtention of memories with LaNiO3 and LaNiO3/BaTiO3 using PLD |
| Grantee: | Leonélio Cichetto Junior |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |