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This work is focused on the phase diagrams and physical properties of Y-dopedand Lu-doped EuMnO3. The differences in the corresponding phase boundaries inthe (x,T) phase diagram could be overcome by considering a scaling of the Y3+and Lu3+ concentrations to the tolerance factor. This outcome evidences thatthe tolerance factor is in fact a more reliable representative of the latticedeformation induced by doping. The normalization of the phase boundaries usingthe tolerance factor corroborates previous theoretical outcomes regarding thekey role of competitive FM and AFM exchanges in determining the phase diagramsof manganite perovskites. Though, significant differences in the nature andnumber of phases at low temperatures and concentrations could not be explainedby just considering the normalization to the tolerance factor. The verticalphase boundary observed just for Lu-doped EuMnO3, close to 10%Lu, is understoodconsidering a low temperature Peierls-type spin-phonon coupling, whichstabilizes the AFM4 phase in Lu-doped EuMnO3.

Competing exchanges and spin-phonon coupling in Eu1-xRxMnO3 (R=Y,Lu)