The exploration of the Mn4+-rich side of the Pr1
-
x
Sr
x
MnO3 system has allowed the extension
of the domain of the cubic perovskite, by using a two-step process, combining synthesis under
Ar flow at high temperature and O2 pressure annealing at lower temperature. We show
that these Pr-doped cubic perovskites exhibit a coupled structural (cubic-tetragonal) and
magnetic (para-antiferro) transition connected with a resistivity jump at the same temperature. The strong interplay between lattice, charges, and spins for these oxides results from
the appearance at low temperature of the distorted C-type antiferromagnetic structure. The
Pr1
-
x
Sr
x
MnO3 magnetic phase diagram shows, for 0.9 ≤ x < 1 (i.e., on the Mn4+-rich side),
the existence at low temperature of C- and G-type antiferromagnetism. The absence of
ferromagnetic−antiferromagnetic competition explains that magnetoresistante properties
are not observed in this system, in contrast to Mn4+-rich Ln1
-
x
Ca
x
MnO3 systems.
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