Magnetoresistance enhancement and temperature stability of magnetoresistance in La1-x(Sr1-yNay)xMnO3
来源期刊：Rare Metals2012年第4期
论文作者：WANG Guiying a,b,YAN Guoqing a,b,YANG Jie a,b,WANG Wenqi a,b,TANG Yonggang a,b,SONG Qixiang a,b,ZHANG Mingyu a,b,and PENG Zhensheng a,c a Anhui Key Laboratory of Spintronic and Nanometric Materials(Cultivating Base),Suzhou ,China;b School of Mechanical and Electronic Engineering,Suzhou University,Suzhou ,China;c Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei ,China
文章页码：387 - 391
摘 要：A series of the samples La1-x(Sr1-yNay)xMnO3（y=0.0,0.2,0.4,0.6,0.8,1.0） were prepared by the solid-state reaction method.Magnetoresistance enhancement and temperature stability of magnetoresistance in the system La1-x(Sr1-yNay)xMnO3 with unchanged Mn3+/Mn4+ ratio through the doping of both monovalent and divalent elements at A site were studied through the measurements of X-ray diffraction（XRD） patterns,resistivity-temperature（ρ-T） curves and magnetoresistance-temperature（MR-T） curves.The results indicate that with the increase of Na doping amount,the peak value of MR increases,and it increases from 12.4% for y=0.2 to 50.6% for y=1.0 in the magnetic field B=0.8 T;ρ-T curves exhibit the double-peak phenomenon,which comes from the competition between the resistivity of surface phase and that of body phase;for the sample of y=0.8,MR increases slowly from 8.3% to 9.4% in the temperature range from 259 to 179 K,and MR is so stable in such a wide temperature range,which provides reference for the research on the temperature stability of MR.
WANG Guiying a,b,YAN Guoqing a,b,YANG Jie a,b,WANG Wenqi a,b,TANG Yonggang a,b,SONG Qixiang a,b,ZHANG Mingyu a,b,and PENG Zhensheng a,c a Anhui Key Laboratory of Spintronic and Nanometric Materials(Cultivating Base),Suzhou 234000,China;b School of Mechanical and Electronic Engineering,Suzhou University,Suzhou 234000,China;c Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China
摘 要：A series of the samples La1-x(Sr1-yNay)xMnO3（y=0.0,0.2,0.4,0.6,0.8,1.0） were prepared by the solid-state reaction method.Magnetoresistance enhancement and temperature stability of magnetoresistance in the system La1-x(Sr1-yNay)xMnO3 with unchanged Mn3+/Mn4+ ratio through the doping of both monovalent and divalent elements at A site were studied through the measurements of X-ray diffraction（XRD） patterns,resistivity-temperature（ρ-T） curves and magnetoresistance-temperature（MR-T） curves.The results indicate that with the increase of Na doping amount,the peak value of MR increases,and it increases from 12.4% for y=0.2 to 50.6% for y=1.0 in the magnetic field B=0.8 T;ρ-T curves exhibit the double-peak phenomenon,which comes from the competition between the resistivity of surface phase and that of body phase;for the sample of y=0.8,MR increases slowly from 8.3% to 9.4% in the temperature range from 259 to 179 K,and MR is so stable in such a wide temperature range,which provides reference for the research on the temperature stability of MR.
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