High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology of China, Hefei 230026, People's Republic of China.
J Phys Condens Matter. 2012 Feb 8;24(5):056003. doi: 10.1088/0953-8984/24/5/056003. Epub 2012 Jan 17.
In this paper, we investigate the electric, magnetic, structural, and thermal properties of spinel CoV(2)O(4). The temperature dependence of magnetization shows that, in addition to the paramagnetic-to-ferrimagnetic transition at T(C) = 142 K, two magnetic anomalies exist at 100 K, T(1) = 59 K. Consistent with the anomalies, the thermal conductivity presents two valleys at 100 K and T(1). At the temperature T(1), the heat capacity shows one peak, which cannot be attributed to the structural transition as revealed by the x-ray diffraction patterns for CoV(2)O(4). Below the transition temperature T(1), the ac susceptibility displays the characteristics of a glass. The series of phenomena at T(1) and the orbital state on V(3+) sites are discussed.
在本文中，我们研究了尖晶石 CoV(2)O(4) 的电学、磁学、结构和热学性质。磁化强度的温度依赖性表明，除了在 T(C) = 142 K 处的顺磁到亚铁磁转变外，在 100 K 和 T(1) = 59 K 处还存在两个磁异常。与异常一致，热导率在 100 K 和 T(1)处呈现两个低谷。在温度 T(1)处，热容显示出一个峰值，这不能归因于 X 射线衍射图案所示的 CoV(2)O(4)的结构转变。在温度 T(1)以下，交流磁化率显示出玻璃的特征。讨论了 T(1)处的一系列现象和 V(3+)位的轨道态。
