Magnetic properties, resistivity, and heat capacity of EuMnO3 and Eu(0.7)A(0.3)MnO(3) (A = Ca, Sr) compounds

We present magnetic-, resistivity-, and specific-heat measurements of the t itle compounds and found that in Eu0.7Sr0.3MnO3 an insulator-metal transiti on can be induced by an external field below 60 K while Eu0.7Ca0.3MnO3 rema ins insulating. EuMnO3 exhibits two magnetic transitions at 35 and 47 K whi ch are associated with the appearance of a weak ferromagnetic component and antiferromagnetic ordering, With respect to the parent compound, Ca and Sr substitution enhance the ferromagnetic component significantly, however, f or low fields and after zero-field cooling the antiferromagnetic ground sta te is preserved to a large extent. (C) 1998 American Institute of Physics. [S0021-8979(98)26711-9].