Abstract
We have studied the effect of Ca-doping in single-crystal Tb1−xCaxMnO3(x≤0.1) on the crystal and magnetic structure, magnetocapacitance, and electric polarization. For low doping (x=0.05), the presence of Mn4+ ions gives rise to a state with behavior resembling that of a relaxor ferroelectric. The coherence length of the Mn magnetic spin spiral is reduced, while the Mn-modulation wave vector is unchanged. For doping larger than 5%, the ferroelectric state is suppressed, which we ascribe to breakdown of the spiral magnetic structure.
Original language | English |
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Article number | 024109 |
Number of pages | 5 |
Journal | Physical Review B (Condensed Matter and Materials Physics) |
Volume | 78 |
DOIs | |
Publication status | Published - 11 Jul 2008 |
Externally published | Yes |