Effect of magnetic field on the spin-Peierls transition in single-crystal CuGeO  

作　　者：王清波 徐象繁 陶前 王洪涛 许祝安 

机构地区：[1]Department of Physics,Zhejiang University [2]Department of Physics and Information Science,Wenzhou University

出　　处：《Chinese Physics B》2008年第9期3490-3494,共5页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No 10634030);the Zhejiang Province Natural Science Foundation of China (Grant No Y605106)

摘　　要：This paper reports that high quality CuGeO3 single crystals were successfully grown by floating-zone technique and the magnetic property was studied. The temperature dependence of magnetic susceptibility below the spin-Peierls （SP） transition temperature （Tsp） under magnetic fields applying along both the a- and c-axis direction can be fitted well by a model of noninteracting dimmers. The spin gap derived from the fitting is consistent with other reports. There is a very weak anisotropy in the fitting parameters for different directions, which should be expected from a SP system. A small upturn in susceptibility at low temperature due to paramagnetic impurities and/or defects can be observed. A suppression of the upturn by magnetic field is first discovered in this system and the possible origins for this suppression are discussed.This paper reports that high quality CuGeO3 single crystals were successfully grown by floating-zone technique and the magnetic property was studied. The temperature dependence of magnetic susceptibility below the spin-Peierls （SP） transition temperature （Tsp） under magnetic fields applying along both the a- and c-axis direction can be fitted well by a model of noninteracting dimmers. The spin gap derived from the fitting is consistent with other reports. There is a very weak anisotropy in the fitting parameters for different directions, which should be expected from a SP system. A small upturn in susceptibility at low temperature due to paramagnetic impurities and/or defects can be observed. A suppression of the upturn by magnetic field is first discovered in this system and the possible origins for this suppression are discussed.

关 键 词：spin chain spin-Peierls transition spin dimmer magnetic susceptibility 

分 类 号：O482.5[理学—固体物理]