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Metal-insulator transition induced by a magnetic field in the compounds Eu0.7 A 0.3MnO3 (A=Ca, Sr)
Authors:Ya M Mukovskii  A M Ionov
Institution:(1) Moscow State Institute of Steel and Alloys, 117935 Moscow, Russia
Abstract:The temperature R(T) and field R(H) dependences of the electrical resistance in the compound Eu0.7 A 0.3MnO3 (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 T a, the function R(T) is semiconducting in character. Application of a magnetic field H that exceeds a certain critical value H c changes the character of the function R(T) for Eu0.7Sr0.3MnO3 to metallic (dR/dT>0). For T<T a and H<H c 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. Fiz. Tverd. Tela (St. Petersburg) 40, 708–712 (April 1998)
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