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

• 来源期刊: 中国物理B（英文版）
• 关键词: spin chain spin-Peierls transition spin dimmer magnetic susceptibifity
• 年，卷（期）: 2008,（9）
• 页码范围: 3490-3494
• 页数: 5页
• 语种: 英文

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.