| Abstract: | Comprehensive investigations into crystal structures, electrical and magnetic properties of the (La1−xCax)MnO3 (x = 0 ÷ 0.6) solid solutions are performed. Two concentration magnetic phase transitions are found: antiferromagnetic-ferromagnetic with x = 0.14 and ferromagnetic (Tc = 150 K) - ferromagnetic (Tc = 260 K) at f = 0.2. It is shown that the first of them is due to the crystal structure O′ O orthorhombic transition, the second - to the increase of ferromagnetic interaction at the expense of additional interaction through conduction electrons. A diagram of the magnetic states for (La1−xCax)MnO3 at x = 0 / 0.6 is given. |
