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The ceramic sample of La_{1・4}Sr_{1・6}Mn_{2}O_{7 · 06}exhibits the metal-insulator transition and a negative magnetoresustance in the vicinity of the Curie temperature (Tcsimeq 100K). The dcmagnetic susveptibility between 100 K and 280 K is nearly constant and decreases gradually eith increasing temperatire above 280 K. The measurements of dc resistivity and the thermoelectric power indicate that small polaron hoppong conduction takes place at T > 280 K.The spin order due to the two-dimensional d_{x^2-Y^2} state occurring at T>280 K is directly related to the hopping conduction above 280 K, although the spin ordering due to the one-dimensional d_{3z^2-r^2} state takes place at T>Tc.The two-dimensional d_{x^2-y^2}state ectending within the MnO_{2} sheets starts to narrow and leads to the carrier localisation at 208 K.The effective number of holes in this sample estimated from the thermoelectric power is considerably smaller than the nominal value. This indicates that the small polaron hopping conduction takes olace predominantly within the in-plane MnO_{2} sheets. A discussion is given of the experimental results of the ceramic sample of La_{2/3}Ca_{1/3}Mno_{2・98}

Small Polaron Hopping Conduction in Samples of Ceramic La1 · 4Sr1 · 6Mn2O7 · 06