Phys. Rev. B 78, 024109 (2008) [5 pages]Relaxor ferroelectric behavior in Ca-doped TbMnO3Received 14 May 2008; revised 6 June 2008; published 11 July 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.024109
DOI:
10.1103/PhysRevB.78.024109
PACS:
77.80.−e, 75.47.Lx, 77.84.−s
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