| Autor: |
Sobolev, Alexey V., Glazkova, Iana S., Akulenko, Alena A., Sergueev, Ilya, Chumakov, Alexandr I., Yi, Wei, Belik, Alexei A., Presniakov, Igor A. |
| Zdroj: |
The Journal of Physical Chemistry - Part C; September 2019, Vol. 123 Issue: 38 p23628-23634, 7p |
| Abstrakt: |
The relationship between hyperfine interactions, local structure, and magnetism in ordered double perovskites A2NiMnO6(A = Sc, In, and Tl) is investigated by nuclear forward scattering with the 61Ni nuclear transition. Special attention is given to a quantitative determination of on-site and transferred hyperfine fields on the 61Ni nuclei. The anomalous small value of the saturated hyperfine magnetic field Hhf(0) in antiferromagnetic Sc2NiMnO6is explained by spin-orbital coupling and strong Ni-3d and O-2p hybridization. The temperature evolution of Hhf(T) is reproduced with Néel temperature TN1≈ 37 K, which is incompatible with the earlier assumption that magnetic ordering in the Ni sublattice takes place below TN2≈ 17 K. Significantly reduced fields Hhf(0) in In2NiMnO6(∼21 kOe) with a cycloidal magnetic structure and Tl2NiMnO6(∼18 kOe) with collinear ferromagnetic ordering are related to the supertransferred hyperfine field (HSTHF) induced by the nearest Mn4+neighbors. Taking into account the angular dependence HSTHF(ϑ) on the Ni–O–Mn bond angle ϑ, we have shown that HSTHFin the A = In and Tl perovskites has the negative sign, thus drastically reducing the resulting Hhfvalue. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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