Effect of magnetic field on the spin-Peierls transition in single-crystal CuGeO
Wang Qing-Bo(王清波)a), Xu Xiang-Fan(徐象繁)a), Tao Qian(陶前)a), Wang Hong-Tao(王洪涛)b), and Xu Zhu-An(许祝安)a)†
a Department of Physics, Zhejiang University, Hangzhou 310027, China; b Department of Physics and Information Science, Wenzhou University, Wenzhou 325027, China
Abstract This paper reports that high quality CuGeO$_{3}$ 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 ($T_{\rm sp})$ 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.
Received: 03 January 2008
Revised: 05 February 2008
Accepted manuscript online:
PACS:
75.30.Kz
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 10634030) and the
Zhejiang Province Natural Science Foundation of China (Grant No
Y605106).
Cite this article:
Wang Qing-Bo(王清波), Xu Xiang-Fan(徐象繁), Tao Qian(陶前), Wang Hong-Tao(王洪涛), and Xu Zhu-An(许祝安) Effect of magnetic field on the spin-Peierls transition in single-crystal CuGeO 2008 Chin. Phys. B 17 3490
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