Symmetry Origin of the Phase Transitions and Phase Separation in Manganites at Low Doping

Details Symmetry Origin of the Phase Transitions and Phase Separation in Manganites at Low Doping Symmetry Origin of the Phase Transitions and Phase Separation in Manganites at Low Doping

1999-10-27

arxiv.org/abs/cond-mat/9910447v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 eps figure, Revtex, Phys. Rev. B60 Nov. 1999

Scientific paper

10.1103/PhysRevB.60.11883

We analyze the symmetry changes of the paramagnetic to the A-type antiferromagnetic and to the ferromagnetic phase transitions in undoped and moderately doped LaMnO$_3$, respectively. We show that in the orthorhombic-distorted perovskite manganites the phase separation at low doping is associated with the noncollinear nature of the magnetic orders permitted by symmetry. A simple model for the competition between the two phase transitions is put forward within the framework of Landau theory of phase transitions.

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