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Makarova, O. L.; Mirebeau, I.; Кичанов, С. Е.; Rodriguez-Carvajal, J.; Forget, A.

doi:10.1103/physrevb.84.020408

Cited by 26 publications

(14 citation statements)

References 22 publications

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“…Recent studies have reported a pressure-induced change in the magnetic structure of TbMnO 3 which adopts an E-type structure above 3.6 GPa, similar to HoMnO 3 at ambient pressure. 35 This is not the case for the Al-doped samples studied in this work. This fact might be due either to an insufficient volume reduction by doping ("chemical pressure") or to the inhomogeneity of the Mn sublattice.…”

Section: Discussionmentioning

confidence: 49%

Effects of Al substitution on the multiferroic properties of TbMnO3

et al. 2012

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The effect of a small substitution of Mn with Al in TbMnO 3 has been studied. We report results of heat capacity, magnetization, and dielectric constant studies in TbMn 1−x Al x O 3 compounds (x 0.1). Al has the same valence as substituted Mn but is nonmagnetic and its small size gives rise to microstructural strain which affects the multiferroic properties of the parent compound. Long-range antiferromagnetic ordering is observed in all compounds but the transition temperature decreases as the Al content increases. TbMn 0.95 Al 0.05 O 3 exhibits a ferroelectric phase transition which is absent in TbMn 0.9 Al 0.1 O 3 . The dielectric constant of the latter compound reveals a relaxor behavior suggesting the presence of nanosize polar domains for this compound. A neutron diffraction study on a single crystal of TbMn 0.9 Al 0.1 O 3 reveals that Mn shows a sinusoidal incommensurate ordering down to low temperature. Tb moments exhibit an incommensurate short-range ordering but the application of a magnetic field leads to metamagnetic transitions. In particular, a field parallel to the b axis induces a commensurate long-range ordering of Tb of type C x F y . The magnetic field also affects the magnetic structure of Mn 3+ moments at low temperature which develop an incommensurate cycloid ordering in the ab plane. This result suggests that dilution of a magnetic multiferroic with a small nonmagnetic atom might yield materials with a relaxor to ferroelectric transition driven by a magnetic field.

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Section: Discussionmentioning

confidence: 49%

Effects of Al substitution on the multiferroic properties of TbMnO3

et al. 2012

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“…This is consistent with a previous neutron diffraction result on TbMnO 3 (ref. 17). In turn, the magnetic transition from the cycloid to the E-AFM phase can qualitatively explain the observed pressure-induced polarization flop transition and the enhancement of P s in the high-pressure phase.…”

Section: Pressure Versus Temperature Phase Diagrammentioning

confidence: 66%

“…In fact, a powder neutron diffraction study under high pressures on TbMnO 3 indicates that the spiral spin-ordered state transforms into the E-AFM phase at around 3.6 GPa (ref. 17). Though there are few works 18 focused on the effects of applied pressure on spin-driven ferroelectricity in TbMnO 3 , these studies have been carried out only up to 1B2 GPa and have never reported drastic changes in the ground state, (such as a pressure-induced ferroelectric phase transition).…”

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confidence: 99%

Giant spin-driven ferroelectric polarization in TbMnO3 under high pressure

et al. 2014

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The recent research on multiferroics has provided solid evidence that the breaking of inversion symmetry by spin order can induce ferroelectric polarization P. This type of multiferroics, called spin-driven ferroelectrics, often show a gigantic change in P on application of a magnetic field B. However, their polarization (oB0.1 mC cm À 2 ) is much smaller than that in conventional ferroelectrics (typically several to several tens of mC cm À 2 ). Here we show that the application of external pressure to a representative spin-driven ferroelectric, TbMnO 3 , causes a flop of P and leads to the highest P (E1.0 mC cm À 2 ) among spin-driven ferroelectrics ever reported. We explain this behaviour in terms of a pressureinduced magnetoelectric phase transition, based on the results of density functional simulations. In the high-pressure phase, the application of B further enhances P over 1.8 mC cm À 2 . This value is nearly an order of magnitude larger than those ever reported in spin-driven ferroelectrics.

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“…As expected from several recent theoretical calculations, magnetic phase transitions inducing ferroelectricity can also be efficiently controlled by hydrostatic pressure [13,14]. However, very few experimental studies related to the pressure effect on multiferroics have been reported so far [15][16][17][18].…”

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confidence: 74%