Theory of spin wave excitation in manganites

Details Theory of spin wave excitation in manganites Theory of spin wave excitation in manganites

1999-01-11

arxiv.org/abs/cond-mat/9901076v2

Physical Review B 61,1189 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.61.1189

The role of the orbital degrees of freedom is studied theoretically for the spin dynamics of $R_{1-x}A_x$MnO$_3$. Based on the meanfield solution, an RPA calculation has been done and it is found that the $d_{x^2-y^2}$-type orbital is essential for the double-exchange (DE) interactions, i.e., the DE is basically two-dimensional interaction. Based on this results compared with experiments, we propose that the orbital wavefunction is $d_{x^2-y^2}$-type locally even in the metallic ferromagnetic state, which fluctuate quantum mechanically. Well agreement of the estimation with experiments suggest that the Jahn-Teller phonon has less importance on the spin dynamics.

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