Publication Type
Journal
Journal Name
Physical Review Letters
Publication Date
Page Number
107204
Volume
103
Issue
10
Abstract
The phase diagram of quarter-hole-doped perovskite manganites is investigated using the doubleexchange
model. An exotic striped type-II multiferroic phase, where 25% of the nearest-neighbor spin
couplings are orthogonal to each other, is found in the narrow-bandwidth region. Comparing with the
spiral-spin ordering phase of undoped manganites, the multiferroic Curie temperature of the new phase is
estimated to be 4 times higher, while the ferroelectric polarization is similar in magnitude. Our study
provides a path for noncollinear spin multiferroics based on electronic self-organization, different from
the traditional approach based on superexchange frustration.
