Author/Authors :
J. Agostinho Moreira، نويسنده , , J. and Almeida، نويسنده , , A. and Ferreira، نويسنده , , W.S. and Chaves، نويسنده , , M.R. and Oliveira، نويسنده , , J.B. and Machado da Silva، نويسنده , , J.M. and Sل، نويسنده , , M.A. and Vilela، نويسنده , , S.M.F. and Tavares، نويسنده , , P.B.، نويسنده ,
Abstract :
This work reports an experimental investigation of the ferroelectric character of magnetic phases of the orthorhombic Eu1−xY xMnO3 system at low temperatures. The temperature dependence of the polarization curves clearly reveals the existence of a re-entrant improper ferroelectric phase for x = 0.2 , 0.3 and 0.5. A ferroelectric phase is also stable for x = 0.4 , and we have no experimental evidence for its vanishing down to 7 K. From these and early results obtained using other experimental techniques, the corresponding ( x , T ) phase diagram was traced, yielding significant differences with regard to the ones previously reported.
