Magnetic and Transport Properties of LaCo1-xNixO3-Comparison with La1-xSr2CoO3.

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  • Kobayashi Yoshihiko
    Department of Applied Physics and Chemistry, University of Electro–Communications, Tokyo 182–8585
  • Murata Satoru
    Department of Applied Physics and Chemistry, University of Electro–Communications, Tokyo 182–8585
  • Asai Kichizo
    Department of Applied Physics and Chemistry, University of Electro–Communications, Tokyo 182–8585
  • Tranquada J. M.
    Brookhaven National Laboratory, Upton, New York 11973, USA
  • Shirane G.
    Brookhaven National Laboratory, Upton, New York 11973, USA
  • Kohn Kay
    Department of Physics, Waseda University, Okubo–3, Tokyo 169–8555

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  • Magnetic and Transport Properties of LaCo1-xNixO3-Comparison with with La1-xSrxCoO3
  • Magnetic and Transport Properties of LaCo<sub><b>1-<i><i>x</i></i></b></sub>Ni<sub><i><i>x</i></i></sub>O<sub><b>3</b></sub>-Comparison with La<sub><b>1-<i><i>x</i></i></b></sub>Sr<sub><i><i>x</i></i></sub>CoO<sub><b>3</b></sub>

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Abstract

We have investigated magnetization, neutron scattering, resistivity, thermoelectric power and Hall effect in LaCo1-xNixO3 (x=0.05 and 0.1) single crystals. At low temperatures, they show spin-glass behavior with a strong ferromagnetic correlation. Around 500, K, spin state transition from the intermediate spin state (S=1) to the high spin state (S=2) accompanied by an insulator-to-metal transition is observed as in undoped LaCoO3. These magnetic properties of LaCo1-xNixO3 are very similar to those previously reported for La1-xSrxCoO3. The low-temperature transport properties of both LaCo1-xNixO3 and La1-xSrxCoO3 exhibit the characteristics of an insulator near the insulator-to-metal transition. The sign of the carrier is verified to be positive in both systems from the thermoelectric power measurement. However, the sign of the Hall coefficient of LaCo1-xNixO3 is negative. These transport properties are discussed in terms of small polaron hopping mechanism.

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