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Tailoring the magnetic states by controlling octahedral cation arrangement in double perovskite | | S. Majumder
; M. Tripathi
; R. Raghunathan
; P. Rajput
; S. N. Jha
; D. O. de Souza
; L. Olivi
; R. J. Choudhary
; D. M. Phase
; | | Date: |
13 Sep 2020 | | Abstract: | The predictability of any characteristic functional aspect in a double
perovskite (DP) system has always been compromised by its strong dependence
over the inevitably present anti-site disorders (ASD). Here, we aim to
precisely map the qualitative and quantitative factors concerning ASD with
respect to the corresponding observables describing the magnetic and electronic
state in epitaxial Sm$_{2} $NiMnO$_{6} $ (SNMO) DP thin films. The
concentration and distribution patterns of ASD are effectively controlled by
optimizing growth conditions and estimated on both local and global scales
utilizing extended X-ray absorption fine structure and bulk magnetometry.
Depending upon the mis-site defect densities, the nature of disorder
distribution can vary from homogeneous to partially segregated patches. The
magnetic behavior of SNMO compromises between long range FM ordering and short
scale AFM interactions originated from ordered Ni-O-Mn and disordered Ni-O-Ni
or Mn-O-Mn bonds, respectively, which can be modified substantially by
controlling B-site cation arrangement. With increasing ASD, systematic shift in
transition temperatures, drastic drop in saturation moment along with deviation
from uniaxial anisotropy behavior, reduction in anisotropy energy and increase
in defect dimension involving moment pinning efficiency are observed. However,
$ Ni^{2+}+Mn^{4+} longrightarrow Ni^{3+}+Mn^{3+} $ charge fluctuation mediated
signatures of mixed valence characters are found to be independent of cation
disorder densities. Inter competing magnetic interactions from Sm vs Ni-Mn
sublattice results in metastable magnetic ground state with manifolds of uneven
free energy landscape configurations. This work provides a route-map to tailor
the magnetic phase transitions, anisotropy behavior and magnetization reversal
mechanism by engineering the ASD fractions in a general DP system. | | Source: | arXiv, 2009.06020 | | Services: | Forum | Review | PDF | Favorites | |
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