| Texto completo | |
| Autor(es): |
Gratens, X.
;
Chitta, V.
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Journal of Applied Physics; v. 122, n. 4 JUL 28 2017. |
| Citações Web of Science: | 0 |
| Resumo | |
Three new distant neighbor (DN) antiferromagnetic exchange constants have been measured in wurtzite Cd1-xMnxS (x = 0.0087 and x = 0.0278) using the magnetization steps method in the millikelvin regime. The second (J((2))), third (J((3))), and fourth (J((4))) largest exchange constants (after the two first neighbor exchange interactions J(1) and J(1)') have been measured. The results are J((2)) = 300610 mK, J((3)) = 173610 mK, and J((4)) = 55610 mK. No significant change of the exchange constant values has been observed as a function of the Mn concentration. The mapping of the DN exchange interactions has been investigated within a sphere of radius 2 times the nearest neighbors distance. The only way to identify the J constants was using the number coordination Zn of the different DN classes: J((2)) is associated to DN classes with Zn = 6, J((3)) with Zn = 12, and J((4)) is ascribed to a group of three DN classes with J values around J((4)). The magnitude of the J constants is not in agreement with theoretical predictions of the monotonic decrease of the exchange constant with increasing distance. The present results are similar to those obtained for Cd1-xMnxSe but are different from the ones obtained for Zn1-xMnxO. The present work confirms the long-range character of the DN exchange interactions in the wurtzite type Mn-based II-VI diluted magnetic semiconductors. Published by AIP Publishing. (AU) | |
| Processo FAPESP: | 15/16191-5 - Pesquisas em novos materiais envolvendo campos magnéticos intensos e baixas temperaturas |
| Beneficiário: | Gennady Gusev |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |