Effect of Short-Range Ferromagnetic Ordering on the Electrical Transport Properties of (La0.9Bi0.1)2/3Ca1/3MnO3 in the Magnetic Field up to 40 T

The temperature and magnetic field dependence of the resistance of polycrystalline sample (La0.9Bi0.1)2/3Ca 1/3MnO3 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 BJ2 (gμBJ(T)B/kBT) 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 (∼35) 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 La 2/3Ca1/3MnO3, 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 (La0.9Bi 0.1)2/3Ca1/3MnO3. © 2013 Springer Science+Business Media New York.status: publishe