| Full text | |
| Author(s): |
Rosa, P. F. S.
;
Iwamoto, W.
;
Holanda, L. M.
;
Ribeiro, R. A.
;
Pagliuso, P. G.
;
Rettori, C.
;
Avila, M. A.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW B; v. 87, n. 22, p. 5-pg., 2013-06-14. |
| Abstract | |
Single crystals of the type-I clathrate series Sr8-xEuxGa16Ge30 (x = 0.01-8) were grown by Ga flux and systematically studied by magnetic susceptibility, electrical resistivity, and electron spin resonance (ESR) measurements. Both magnetic transition temperatures (T-c and T*) were mapped as a function of x. We found that the Curie temperature (T-c) and the magnetic anomaly temperature (T*) decrease systematically as Eu is substituted by Sr until no ordering is observed above 2 K for x = 1.0. For samples where the rattling Einstein temperature of theta(E) approximate to 25-60 K lies above T-c, we have observed no features in the ESR data, suggesting that the Eu2+ 4f spin dynamics is weakly coupled to the rattling modes. As the temperature is lowered and the magnetic field is increased, the ESR linewidth (Delta H) behavior points to the formation of magnetic polarons. (AU) | |
| FAPESP's process: | 11/23650-5 - Investigation of band structure and Fermi surface in advanced complex materials studied by angle-resolved photoemission spectroscopy |
| Grantee: | Cris Adriano |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| FAPESP's process: | 06/60440-0 - Study of strongly correlated systems in extreme conditions |
| Grantee: | Carlos Rettori |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 09/09247-3 - Investigation of pressure induced ordered states in novel complex materials. |
| Grantee: | Cris Adriano |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 10/11949-3 - Electron spin resonance (ESR) in superconducting Fe-based pnictides |
| Grantee: | Priscila Ferrari Silveira Rosa |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 11/01564-0 - Materials sciences on complex and advanced systems |
| Grantee: | Pascoal Jose Giglio Pagliuso |
| Support Opportunities: | Scholarships abroad - Research |