Pressure Effects in Manganites with Layered Perovskite Structure

Details Pressure Effects in Manganites with Layered Perovskite Structure Pressure Effects in Manganites with Layered Perovskite Structure

1997-12-15

arxiv.org/abs/cond-mat/9712162v1

Journ. Phys. Soc. Jpn. Vol. 66, No. 10, pp. 2965-2968 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 2 figures

Scientific paper

10.1143/JPSJ.66.2965

Pressure effects on the charge and spin dynamics in the bilayer manganite compounds $La_{2-2x}Sr_{1+2x}Mn_2O_7$ are studied theoretically by taking into account the orbital degrees of freedom. The orbital degrees are active in the layered crystal structure, and applied hydrostatic pressure stabilizes the $3d_{x^2-y^2}$ orbital in comparison with $3d_{3z^2-r^2}$. The change of the orbital states weakens the interlayer charge and spin couplings, and suppresses the three dimensional ferromagnetic transition. Numerical results, based on an effective Hamiltonian which includes the energy level difference of the orbitals, show that the applied pressure controls the dimensionality of the spin and charge dynamics through changes of the orbital states.

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