La_2CuO_4在平行CuO_2面磁场中的磁转变  

MAGNETIC TRANSITION IN La_1CuO_4 INDUCED BY MAGNETIC FIELD PARALLEL TO CuO_2 PLANE

作　　者：俞志明[1] 吴杭生[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026

出　　处：《物理学报》1993年第1期114-117,共4页Acta Physica Sinica

摘　　要：本文在平均场近似下,给出一个关于在平行CuO_2面的磁场作用下,La_2CuO_4的磁转变理论。理论给出的临界磁场随温度T的变化,在定性上与实验相符。但是,从本文理论看,不存在多重临界点。简单讨论了理论和实验不符合的原因。In this letter, we develop a theory in the mean-field approximation for the spin-flop transition in La2CuO4 when the magnetic field is parallel to the CuO2 plane. The temperature dependence of the critical field predicted by our theory agree qualitatively with the experiment. However, there is no multicritical point according to our theory. The origin of this disagreement is discussed briefly.

关 键 词：铜酸盐 镧 磁转变 临界场 

分 类 号：O482.5[理学—固体物理]