تقرير
Microscopic insights of magnetism in Sm$ _{2} $NiMnO$ _{6} $ double perovskite
| العنوان: | Microscopic insights of magnetism in Sm$ _{2} $NiMnO$ _{6} $ double perovskite |
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| المؤلفون: | Majumder, Supriyo, Tripathi, Malvika, Fischer, H. E., de Souza, D. O., Olivi, L., Sinha, A. K., Choudhary, R. J., Phase, D. M. |
| المصدر: | Phys. Rev. B 105, 094425 1-13 (2022) |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Materials Science |
| الوصف: | The functional characteristics of double perovskites with unique ferromagnetic-insulator ground state have been controversial due to the unavoidable presence of anti-site disorders (ASDs). Here, we aim to investigate the origin of magnetic ordering on local and global scales in Sm$_{2}$NiMnO$_{6}$ (SNMO) double perovskite system. Different calcination routes are exploited to generate different cation arrangements in SNMO and the corresponding magnetic configurations are examined using the high energy (E $ \sim $0.3 eV) `hot neutrons', which has helped to overcome Sm absorption as well as to record total (Bragg's+diffuse) scattering profiles with high momentum transfer (Q$ _{max} \sim $24 angstrom$ ^{-1} $). We have observed that the Ni-Mn sublattice adopts long range collinear ferromagnetic $ F_{x}F_{z} $ structure with commensurate $k$=(0, 0, 0) propagation vector, below ordering temperature T $ \lesssim $ 160 K, irrespective of variable ASD concentrations. In addition, the signatures indicating the antiparallel polarization of Sm paramagnetic moments with respect to Ni-Mn network, are noticed in the vicinity of anomalous magnetic transitions at T $ \lesssim $ 35 K. The real space pair distribution function calculations have provided a direct visualization of ASDs by means of broadening in Ni/Mn-Mn/Ni linkage. Employing the Reverse Monte Carlo approach on diffuse magnetic scattering profiles, we have observed the negative spin-spin correlation function which suggests the Ni-Ni antiferromagnetic exchange interactions ranging up to first nearest neighbor distance. These results confirm that the existence of ASDs in cation ordered host matrix leads to competing ferromagnetic-antiferromagnetic phases in a broad temperature range, which quantitatively governs the temperature dependent bulk magnetic observables of SNMO system. Comment: 14 pages, 8 figures, and Supplementary Information |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.105.094425 |
| URL الوصول: | http://arxiv.org/abs/2203.03676 |
| رقم الأكسشن: | edsarx.2203.03676 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.105.094425 |
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