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Canted magnetic ground state of quarter-doped manganites R 0.75 Ca 0.25 MnO 3 (R = Y, Tb, Dy, Ho, and Er).
Journal of Physics. Condensed Matter : An Institute of Physics Journal 2017 Februrary 16
Polycrystalline samples of the quarter-doped manganites R 0.75 Ca0.25 MnO3 (R = Y, Tb, Dy, Ho, and Er) were studied by x-ray diffraction and AC/DC susceptibility measurements. All five samples are orthorhombic and exhibit similar magnetic properties: enhanced ferromagnetism below T 1 (∼80 K) and a spin glass (SG) state below T SG (∼30 K). With increasing R 3+ ionic size, both T 1 and T SG generally increase. The single crystal neutron diffraction results on Tb0.75 Ca0.25 MnO3 revealed that the SG state is mainly composed of a short-range ordered version of a novel canted (i.e. noncollinear) antiferromagnetic spin state. Furthermore, calculations based on the double exchange model for quarter-doped manganites reveal that this new magnetic phase provides a transition state between the ferromagnetic state and the theoretically predicted spin-orthogonal stripe phase.
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