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arXiv · 1602.07984

Uniaxial pressure induced half-metallic ferromagnetic phase transition in LaMnO$_3$

Pablo Rivero·Vincent Meunier·William Shelton
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Abstract

We use first-principles theory to predict that the application of uniaxial compressive strain leads to a transition from an antiferromagnetic insulator to a ferromagnetic half-metal phase in LaMnO$_3$. We identify the Q2 Jahn-Teller mode as the primary mechanism that drives the transition, indicating that this mode can be used to tune the lattice, charge, and spin coupling. Applying $\simeq$ 6 GPa of uniaxial pressure along the [010] direction activates the transition to a half-metallic $\textit{pseudo-cubic}$ state. The half-metallicity opens the possibility of producing colossal magnetoresistance in the stoichiometric LaMnO$_3$ compound at significantly lower pressure compared to recently observed investigations using hydrostatic pressure.

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Pablo Rivero, Vincent Meunier, William Shelton. 2016-02-25. Uniaxial pressure induced half-metallic ferromagnetic phase transition in LaMnO$_3$. https://doi.org/10.1103/physrevb.93.094409

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