Charge ordering induced by Sr doping in 3% Cr-doped La0.45Ca0.55?xSrxMnO3
作者： H Wakai , F Munakata , E Iguchi
DOI: 10.1088/0022-3727/36/8/301
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摘要: The relation between the average ionic radius of A-site cations rA and Cr3+–Mn3+/4+ magnetic coupling has been investigated in 3% Cr-doped La0.45Ca0.55−xSrxMnO3. Cr-free La0.45Ca0.55MnO3 undergoes transition from ferromagnetic (FM) to charge ordered antiferromagnetic (CO AFM) phases at low temperature. In x = 0 0.1 compounds, Cr doping suppresses this transition, FM metallic are observed even temperatures. Sr x≥0.2 produces AFM components Particularly, CO phase is 0.25 0.3 despite doping. Antiferromagnetic superexchange interaction t2g (Cr) (Mn) through 2pπ (O) Cr–O–Mn bonds detectable only x≥0.2. Strong Cr3+ its neighbouring Mn3+/4+ probably interferes with long-range ordering. There must be some correlation rA, strong (Cr)–2pπ (O)–t2g likely enhance ordering 0.3.
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