Study of (La_<1-x>Ca_x)MnO_3. : II. Magnetic Properties

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概要

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• Samples of polycrystalline (La_<1-x>Ca_x)MnO_3, where x takes the values ranging from 0.005 to 0.3, were studied experimentally. Stoichimetric specimens were made by carefully controlling the oxygen partial pressure. For specimens with x less than0.1, the Neel temperature T_N is almost constant at 141°K, while the paramagnetic Curie temperature 〓_p increases with x. For speciments with x greater than 0.1, both T_N(or T_C) and 〓_p both increase almost linearly with x. The usual Mn^<55> NMR spectra associated with Mn^<3+> and Mn^<4+> ions are observed for x<__-0.175. Motionally narrowed spectra are observed for x=0.2 and x=0.3. These results can be qualitatively explained by assuming that the d-holes at the sites around Ca^<2+> ions contribute both to the electrical conduction and to the ferromagnetic interaction.

• 社団法人日本物理学会の論文
• 1970-09-05

著者

• Matsumoto Gen

  Department Of Chemistry Biology And Marine Science University Of The Ryukyus

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