| Autor: |
Miroslav Maryško, Valentin V. Laguta, Igor P. Raevski, Roman O. Kuzian, Nikolai M. Olekhnovich, Anatoli V. Pushkarev, Yuri V. Radyush, Svetlana I. Raevskaya, Victor V. Titov, Stanislav P. Kubrin |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
AIP Advances, Vol 7, Iss 5, Pp 056409-056409-6 (2017) |
| Druh dokumentu: |
article |
| ISSN: |
2158-3226 |
| DOI: |
10.1063/1.4973601 |
| Popis: |
Magnetic susceptibility of two types of perovskite compounds A(Fe0.5M0.5)O3 A=Ba,Sr with M=Nb and Sb differing in the degree of chemical ordering was studied between 2 and 380 K. In the low temperature region, these compounds exhibit antiferromagnetic and spin-glass transition at T = 16−30 K. For the ordered compounds (M = Sb) the inverse susceptibility depends on T linearly up to the highest temperatures used. This enables the determination of the Weiss temperature θ and effective moment of the Fe3+ ion expressed by a number of Bohr magnetons, peff. In contrast to it, the compounds with M = Nb are characterized by a higher degree of the glassines and by a concave character of the inverse susceptibility vs T dependence in the high temperature region. In these cases, the values of peff and θ could be estimated only very roughly by extrapolation to higher temperatures. The observed behavior was qualitatively explained from the Curie-Weiss law taking into account a distribution of the values θ, which reflects the presence of different exchange interactions between the Fe3+ ions. The disordered samples (M = Nb) exhibit a roughly two times larger |θ|/TN ratio values as compared to the ordered (M = Sb) ones. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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