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Magnetoresistance of La_(0.60)Sr_(0.40-x)K_xMnO_3

Tang Gui-de

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Abstract

Polycrystalline perovskite rare-earth manganites La0.60Sr0.40-xKxMnO3(x=0.00,0.15,0.20,0.30) were synthesized by sol-gel method.It is found that when Sr2+ ions are partly substituted by K+ ions,the Curie temperature of substituted samples can decrease to room temperature and the room temperature magnetoresistance(MR) increases obviously comparing with un-substituted La0.60Sr0.40MnO3.Under an applied filed of 1.8T,there is a maximum MR with 21% at 304 K for the sample La0.60Sr0.1K0.3MnO3.However,under the same applied field,there is only a maximum MR with 6.4% at 373 K for the un-substituted sample La0.60Sr0.40MnO3.Therefore,K+ ion substitution can remarkably improve the MR of this kind of material.

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What this paper is about

Polycrystalline perovskite rare-earth manganites La0.60Sr0.40-xKxMnO3(x=0.00,0.15,0.20,0.30) were synthesized by sol-gel method.It is found that when Sr2+ ions are partly substituted by K+ ions,the Curie temperature of substituted samples can decrease to room temperature and the room temperature magnetoresistance(MR) increases obviously comparing with un-substituted La0.60Sr0.40MnO3.Under an applied filed of 1.8T,there is a maximum MR with 21% at 304 K for the sample La0.60Sr0.1K0.3MnO3.However,under the same applied field,there is only a maximum MR with 6.4% at 373 K for the un-substituted sample La0.60Sr0.40MnO3.Therefore,K+ ion substitution can remarkably improve the MR of this kind of material.

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Available abstract

Polycrystalline perovskite rare-earth manganites La0.60Sr0.40-xKxMnO3(x=0.00,0.15,0.20,0.30) were synthesized by sol-gel method.It is found that when Sr2+ ions are partly substituted by K+ ions,the Curie temperature of substituted samples can decrease to room temperature and the room temperature magnetoresistance(MR) increases obviously comparing with un-substituted La0.60Sr0.40MnO3.Under an applied filed of 1.8T,there is a maximum MR with 21% at 304 K for the sample La0.60Sr0.1K0.3MnO3.However,under the same applied field,there is only a maximum MR with 6.4% at 373 K for the un-substituted sample La0.60Sr0.40MnO3.Therefore,K+ ion substitution can remarkably improve the MR of this kind of material.

Key concepts: Materials science, Curie temperature, Magnetoresistance, Crystallite, Ion, Perovskite (structure), Analytical Chemistry (journal), Condensed matter physics

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