Abstract
An approach has been developed using the tight-binding and double-exchange Hamiltonian methods for calculating the E(k) spectrum of eg electrons in noncollinear (spiral) magnetic structures of R1 − xAxMnO3 (R = La, Pr, Nd, Sm; A = Ca, Sr, Ba) manganites. A magnetic structure in the form of a flat cycloid observed in TbMnO3 below 28 K has been considered for undoped manganites (x = 0).
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