Abstract
X-ray diffraction measurements have been performed on Nd 0.5 Sr 0.5 MnO 3 single crystals at various temperatures and magnetic fields. The temperature dependences of the lattice parameters show abrupt changes in the slopes at the ferromagnetic transition temperature of 250 K. Discontinuous changes in the lattice parameters occur at the charge-ordering transition temperature of 165 K, below which Mn 3+ and Mn 4+ ions are spatially ordered. In the ferromagnetic phase, the orthorhombic lattice distortion is reduced with decreasing temperature. This behavior can be attributed to a magnetoelastic interaction in this compound. Superlattice reflections corresponding to a doubling of the unit cell along the b axis appear in the charge-ordered phase, and their intensities change very little with temperature and magnetic field except near the transition. When the charge-ordered phase is transformed into the ferromagnetic phase by an external magnetic field, the superlattice reflections vanish and the lattice parameters discontinuously change. Values of the magnetic fields at which the transition occurs are independent of directions of applied magnetic fields.
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