کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1813501 | 1525245 | 2009 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Annihilation of antiferromagnetic order in LiCoO2LiCoO2 by excess Li Annihilation of antiferromagnetic order in LiCoO2LiCoO2 by excess Li](/preview/png/1813501.png)
In order to elucidate the origin of antiferromagnetic (AF) order below 30 K in LiCoO2LiCoO2, in which all the Co3+Co3+ ions are in a low-spin state with S=0S=0, the magnetic nature of the Li-excess sample Li1.04Co0.96O1.96Li1.04Co0.96O1.96 was studied by muon-spin spectroscopy in the temperature range between 1.8 and 100 K. Although disordered localized moments appeared below 25 K, static AF order was not detected even at 1.8 K. Moreover, a small amount of excess Li ions (4%4%) and oxygen vacancies (2%2%) was found to change ∼50%∼50% of the sample into a magnetically disordered phase at 1.8 K. The stoichiometric LiCoO2LiCoO2, which was prepared from the same starting materials to those for the Li-excess sample, showed an AF transition at 30 K, while the volume fraction of the AF phase was 10%10% even at 1.8 K. This therefore excludes the possible role of the excess Li+Li+ on the formation of static AF order.
Journal: Physica B: Condensed Matter - Volume 404, Issues 5–7, 15 April 2009, Pages 769–772