Synthesis And Magnetic Properties Of Fergusonite-Structured La(Nbvmn)O-4

Shunsuke Kawakami,Naoya Takeda,Shigemi Kohiki,Fuki Tsutsui, Juri Harada,Masao Arai,Masanori Mitome, Kazuyo Ohmura,Kunio Yubuta,Toetsu Shishido

EMERGING MATERIALS RESEARCH（2013）

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摘要

The authors have synthesized fergusonite-structured La(Nb0.71V0.04Mn0.25)O-4 samples. The samples, consisting of La3+, Nb5+, V5+, Mn4+ and oxygen ions, demonstrated temperature-dependent magnetization that increased with lowering the temperature below approximate to 200 K, and almost saturated below approximate to 100 K. At 75 K, the field-dependent magnetization demonstrated sigmoidal curve and reached 3 mu(B)/Mn at 1 T. Such a magnetic behavior can be ascribed to exchange interaction between Mn4+Nb2O11 nanoclusters. The Mn4+ substitution for the V5+ sites of the crystal resulted also in the occupied state above the valence band maximum.

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关键词

bulk materials, defects, electronic structure of atoms and molecules, magnetic properties

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