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Polycrystalline samples of the quarter-doped manganites$R_{0.75}$Ca$_{0.25}$MnO$_3$ ($R$ = Y, Tb, Dy, Ho, and Er) were studied byX-ray diffraction and AC/DC susceptibility measurements. All five samples areorthorhombic and exhibit similar magnetic properties: enhanced ferromagnetismbelow $T_1$ ($\sim80$ K) and a spin glass (SG) state below $T_{SG}$ ($\sim30$K). With increasing $R^{3+}$ ionic size, both $T_1$ and $T_{SG}$ generallyincrease. The single crystal neutron diffraction results onTb$_{0.75}$Ca$_{0.25}$MnO$_3$ revealed that the SG state is mainly composed ofa short-range ordered version of a novel canted (i.e. noncollinear)antiferromagnetic spin state. Furthermore, calculations based on the doubleexchange model for quarter-doped manganites reveal that this new magnetic phaseprovides a transition state between the ferromagnetic state and thetheoretically predicted spin-orthogonal stripe phase.

Canted Magnetic Ground State of Quarter-Doped Manganites $R_{0.75}$Ca$_{0.25}$MnO$_3$ ($R$ = Y, Tb, Dy, Ho, and Er)