Possible self-trapped magnetic polaron in EuSe

To our knowledge, there has been no experimental report supporting the existence of the self-trapped magnetic polaron (STMP) indisputably. The present calculation, with use of accurate interaction between localized f spins, enables us to make conclusions about the possible self-trapped magnetic polaron in EuSe, providing that both the values for the effective mass and the d-f exchange interaction used in the calculation are appropriate to this material. The calculated STMP is the typical large magnetic polaron accompanying the induced ferromagnetic region with the radius of the 2--3 lattice constant. To examine this conclusion, we analyze the experimental result for Eu-rich EuSe; the analysis reveals the strong magnetic polaron effect in EuSe. Further experimental confirmation of the existence of the STMP would be desired. {} 1996 The American Physical Society.