Abstract A series of polycrystalline Cu-doped $n$=2 Ruddlesden--Popper manganates La$_{1.2}$Sr$_{1.8}$Cu$_{x}$Mn$_{(2-x)}$O$_{7}$ ($x$=0, 0.04, 0.13) were synthesized by the solid state reaction method. The effect of Cu doping on the magnetic and transport properties has been studied. It is found that Cu substitution for Mn greatly affects the magnetic and electrical properties of the parent phase La$_{1.2}$Sr$_{1.8}$Mn$_{2}$O$_{7}$. With the increase of Cu content, the system undergoes a transition from long-range ferromagnetic order to the spin glass state and further to an antiferromagnetic order. A little of Cu dopant can lead to the samples showing semiconductor or insulator behaviour in the whole observed temperature range while the parent phase has a metal--insulator transition.These samples show colossal magnetoresistance at low temperatures and the value of it decreases with increasing Cu content.
Received: 12 January 2005
Revised: 21 June 2005
Accepted manuscript online:
PACS:
72.20.My
(Galvanomagnetic and other magnetotransport effects)
Fund: Project supported by the State Key Development Program for Basic Research of China (Grant No 1999064508).
Cite this article:
Si Ji-Wei (司继伟), Cao Qing-Qi (曹庆琪), Gu Ben-Xi (顾本喜), Du You-Wei (都有为) Effect of Cu doping on the magnetic and electrical properties of n=2 Ruddlesden--Popper manganates 2005 Chinese Physics 14 2117
Observation of spin glass transition in spinel LiCoMnO4 Chen Hong (陈红), Yang Xu (杨旭), Zhang Pei-Song (张培松), Liang Lei (梁磊), Hong Yuan-Ze (洪源泽), Wei Ying-Jin (魏英进), Chen Gang (陈岗), Du Fei (杜菲), Wang Chun-Zhong (王春忠). Chin. Phys. B, 2015, 24(12): 127501.
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.
