X-ray Diffraction Study on Charge and Orbital Order in Pr_<0.65>Ca_<0.35>MnO_3 under High Pressure(Condensed matter: structure and mechanical and thermal properties)

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X-ray diffraction measurements have been performed on Pr_<0.65>Ca_<0.35>MnO_3 under hydrostatic pressure. Superlattice reflections due to charge and orbital order were measured at various temperatures and pressures. Above 2.1GPa, the superlattice reflections disappear at low temperatures, showing a transition to a charge and orbital disordered phase. We found a pressure-induced phase characterized by a significant change in the intensity of the superlattice reflection. This phase shows reentrant transition behavior. Possible types of orders of the pressure-induced phase are discussed. The diffuse peaks associated with the short-range order observed under pressure is also presented.
社団法人日本物理学会の論文
2007-12-15