Abstract The double-doped La$_{2/3+4x/3}$Sr$_{1/3-4x/3}$Mn$_{1-x}$Mg$_{x}$O$_{3}$ samples with fixed Mn3+/Mn4+ ratio equal to 2/1 are investigated by means of magnetism and transport measurements. Phase separation is observed at temperature higher than Tconset for x=0.10 and 0.15. For x=0.10, rather strong phase separation induces drastic magnetic random potential and results in the localization of carriers. Thus, the variable-range hopping process dominates. For other samples, there is no or only weak phase separation above Tconset. Thus, thermal activation mechanism is responsible for the high temperature transport behaviour. For x=0.20 and 0.25, unexpected AFM behaviour is observed at low temperature. All these results are well understood by considering the special role of the ``double-doping".
Received: 28 March 2006
Revised: 13 June 2006
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project
supported by the National Natural Science Foundation of China (Grant
Nos 10504029
and 10334090), and the State Key Project of Fundamental Research, China
(Grant No 001CB610604).
Cite this article:
Qu Zhe(屈哲), Pi Li(皮雳), Fan Ji-Yu(樊济宇), Tan Shun(谭舜), Zhang Bei (张贝), Zhang Meng(张锰), and Zhang Yu-Heng (张裕恒) Electric and magnetic behaviour in double doped La$_{2/3+4x/3}$Sr$_{1/3-4x/3}$Mn$_{1-x}$Mg$_{x}$O$_{3}$ 2007 Chinese Physics 16 258
Curvature-induced lipid segregation Zheng Bin (郑斌), Meng Qing-Tian (孟庆田), Robin L. B. Selinger, Jonathan V. Selinger, Ye Fang-Fu (叶方富). Chin. Phys. B, 2015, 24(6): 068701.
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
