Abstract
The temperature R(T) and field R(H) dependences of the electrical resistance in the compound Eu0.7A0.3MnO3 (A=Ca, Sr) are investigated in the temperature range 4.2–200 K in magnetic fields up to 14 T. Above the antiferromagnetic transition temperature Ta, the function R(T) is semiconducting in character. Application of a magnetic field H that exceeds a certain critical value Hc changes the character of the function R(T) for Eu0.7Sr0.3MnO3 to metallic (dR/dT>0). For T<Ta and H<Hc a jump in the resistance is observed indicating instability of the electronic state caused by competition between charge and spin ordering of the Mn ions of different valences.
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