Effect of Short-Range Ferromagnetic Ordering on the Electrical Transport Properties of (La0.9Bi0.1)2/3Ca1/3MnO _{详细信息    查看全文}

• 作者：Yuying Wu (1)
  Zhengcai Xia (2)
  Gufei Zhang (3)
  Johan Vanacken (3)
  
• 关键词：Manganites ; Spin ; dependent hopping model ; Magnetic cluster
• 刊名：Journal of Low Temperature Physics
• 出版年：2014
• 出版时间：February 2014
• 年：2014
• 卷：174
• 期：3-4
• 页码：207-213
• 全文大小：379 KB
• 作者单位：Yuying Wu (1)
  Zhengcai Xia (2)
  Gufei Zhang (3)
  Johan Vanacken (3)
  
  1. School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan, 430023, P.R. China
  2. Wuhan High Magnetic Field Center, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, P.R. China
  3. Institute for Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven (KUL), Celestijnenlaan 200D, Leuven, 3001, Belgium
  
• ISSN：1573-7357

文摘

The temperature and magnetic field dependence of the resistance of polycrystalline sample (La0.9Bi0.1)2/3Ca1/3MnO3 was investigated in pulsed high magnetic field up to 40?T over a wide temperature region. In order to describe the magnetotransport properties of the sample, an extended Mott hopping conduction model was employed. Instead of B J (gμ B J(T)B/k B T) in the ferromagnetic (FM) state and $B_{J}^{2}(g\mu_{B}J(T)B/k_{B}T)$ in the paramagnetic (PM) state, the magnetic field dependence of the resistance could scale nicely with the Brillouin function B J (gμ B J(T)B/k B T) in all the given temperatures (above and below the Curie temperature?T c ). The deduced value of the average spin moment J(T) increases with the increasing of the temperature and reaches the maximum value (?5) around?T c . The large value of J(T) indicate the presence of magnetic clusters in the sample which is induced by the short-range ferromagnetic ordering, however, compared to the un-doped compound La2/3Ca1/3MnO3, the value of J(T) is much smaller, which might be ascribe to the location of the 6s2 lone pair electrons of Bi3+ ions in the sample (La0.9Bi0.1)2/3Ca1/3MnO3.