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19 April 2024 |
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Competing exchanges and spin-phonon coupling in Eu1-xRxMnO3 (R=Y,Lu) | | D. A. Mota
; Y. Romaguera Barcelay
; P. B. Tavares
; M.R. Chaves
; A. Almeida
; J. Oliveira
; W. S. Ferreira
; J. Agostinho Moreira
; | | Date: |
11 Aug 2012 | | Abstract: | This work is focused on the phase diagrams and physical properties of Y-doped
and Lu-doped EuMnO3. The differences in the corresponding phase boundaries in
the (x,T) phase diagram could be overcome by considering a scaling of the Y3+
and Lu3+ concentrations to the tolerance factor. This outcome evidences that
the tolerance factor is in fact a more reliable representative of the lattice
deformation induced by doping. The normalization of the phase boundaries using
the tolerance factor corroborates previous theoretical outcomes regarding the
key role of competitive FM and AFM exchanges in determining the phase diagrams
of manganite perovskites. Though, significant differences in the nature and
number of phases at low temperatures and concentrations could not be explained
by just considering the normalization to the tolerance factor. The vertical
phase boundary observed just for Lu-doped EuMnO3, close to 10%Lu, is understood
considering a low temperature Peierls-type spin-phonon coupling, which
stabilizes the AFM4 phase in Lu-doped EuMnO3. | | Source: | arXiv, 1208.2336 | | Services: | Forum | Review | PDF | Favorites | |
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