Magnetic field and external-pressure effect on ferroelectricity in manganites: Comparison between GdMnO3 and TbMnO3

Noda, Kohei; Nakamura, Shoichi; Nagayama, J.; Kuwahara, H.

doi:10.1063/1.1851420

Cited by 76 publications

(60 citation statements)

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“…Contradictory results have been published for GdMnO 3 . Some authors suggest the presence of spontaneous polarization P a at zero field 14,37 while others indicate that P a only appears when a magnetic field is applied along the b axis. 12 These discrepancies point to the strong effects brought by small changes in the stoichiometry of the samples.…”

Section: Discussionmentioning

confidence: 99%

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: 99%

Effects of Al substitution on the multiferroic properties of TbMnO3

et al. 2012

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“…6 The antiferromagnetic coupling between the spins of the Mn 3+ ions within an (001) plane is frustrated, which lowers the spin-ordering Néel temperature. In the case of R = Gd, Tb and Dy, it is worth mentioning that, as the temperature decreases from the incommensurate phase, a lock-in transition takes place to enter a ferroelectric phase, 7 confirming the interplay between electric and magnetic phenomena.…”

Section: Introductionmentioning

confidence: 98%

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
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The critical behavior of the paramagnetic to antiferromagnetic transition in RMnO 3 (R = Sm, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y) has been studied with an ac photopyroelectric calorimeter, which gives simultaneously the thermal diffusivity and specific heat as a function of temperature with high resolution around the Néel temperature. RMnO 3 (R = Sm, Tb, Dy) has an orthorhombic perovskite structure, whereas the other manganites are hexagonal, thus revealing a strong thermal anisotropy. SmMnO 3 with an Type-A antiferromagnetic ordering exhibits a 3D-XY critical behavior, which could be attributed to the peculiar site anisotropy of Sm 3+ and the exchange interaction between Mn 3+ and Sm 3+ ions. The sinusoidal spin ordering in TbMnO 3 and DyMnO 3 can be phenomenologically described by the 3D-Heisenberg model. Finally, the hexagonal manganites RMnO 3 (R = Ho, Er, Tm, Yb, Lu, Y) are close to the 3D-Heisenberg universality class, ruling out the chiral models predicted by the renormalization group theory.

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“…16,18,19 Pressure has only been explored up to 1 GPa through a pressure-dependent study of the dielectric constant at low temperatures. 20 Here, we report a pressure-dependent investigation of the lattice dynamics and crystal structure of GdMnO 3 at room temperature up to 53.2 GPa, through Raman spectroscopy and x-ray powder diffraction. High quality ceramic GdMnO 3 samples were prepared with the sol-gel urea combustion method (see Ref.…”

Section: Doimentioning

confidence: 99%

Structural and insulator-to-metal phase transition at 50 GPa in GdMnO3

et al. 2012

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We present a study of the effect of very high pressure on the orthorhombic perovskite GdMnO 3 by Raman spectroscopy and synchrotron x-ray diffraction up to 53.2 GPa. The experimental results yield a structural and insulator-to-metal phase transition close to 50 GPa, from an orthorhombic to a metrically cubic structure. The phase transition is of first order with a pressure hysteresis of about 6 GPa. The observed behavior under very high pressure might well be a general feature in rare-earth manganites. DOI:PACS:Rare-earth manganites have attracted a continuous attention for their complex correlation between lattice, electric and magnetic degrees of freedom.More recently, magnetoelectric and multiferroic properties of manganites have attracted a particular interest. 1 Most manganites crystallize at ambient conditions in a Pnma structure, which presents distortions away from the ideal cubic perovskite structure through cooperative Jahn-Teller distortion and tilt of the MnO 6 octahedra. Such manganites have been extensively studied as a function of temperature, magnetic field, strain (in thin films), or chemical composition. High pressure is another parameter allowing tuning different degrees of freedom in manganites, but remains little explored to date. A notable exception is the study of the crystal structure, Jahn-Teller distortion, orbital order, and pressureinduced insulator-metallic phase transition in LaMnO 3 , although the driving mechanism still remains controversial. [2][3][4][5][6][7][8] According to the pioneer work by Loa et al 2 , the Jahn-Teller effect and the concomitant orbital ordering are suppressed above 18 GPa. The system retains insulator behavior up to 32 GPa, undergoing a bandwidth driven insulator-metal phase transition. Other authors have reported the persistence of the Jahn-Teller distortion over the entire stability range of the insulating phase of LaMnO 3 , suggesting a non classical Mott insulator. 3,6 No other orthorhombic manganite has attracted such an attention, although we note the pressure investigation of structural properties of the magnetoelectric manganites TbMnO 3 and DyMnO 3 or BiMnO 3 , or more complex solid solutions. [9][10][11] To the best of our knowledge, manganites have not yet been investigated in the very high-pressure regime around 50 GPa, despite promising studies on similar orthoferrites or BiFeO 3 , which have revealed intriguing insulator-to-metal or structural transitions in a similar pressure range. [12][13][14][15] The aim of this work is to explore the effect of very high-pressure on rare-earth manganites. We have chosen GdMnO 3 which currently attracts a considerable attention as a frustrated magnetic system for which a ferroelectric order can be induced by application of a modest magnetic field. [16][17][18] Its phase diagram has been extensively studied as a function of external parameters: Temperature, doping, and high magnetic fields. 16,18,19 Pressure has only been explored up to 1 GPa through a pressure-dependent study of the dielectric constant at ...

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Magnetic field and external-pressure effect on ferroelectricity in manganites: Comparison between GdMnO3 and TbMnO3

Cited by 76 publications

References 10 publications

Effects of Al substitution on the multiferroic properties of TbMnO3

Effects of Al substitution on the multiferroic properties of TbMnO3

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
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Structural and insulator-to-metal phase transition at 50 GPa in GdMnO3

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Magnetic field and external-pressure effect on ferroelectricity in manganites: Comparison between GdMnO3 and TbMnO3

Cited by 76 publications

References 10 publications

Effects of Al substitution on the multiferroic properties of TbMnO3

Effects of Al substitution on the multiferroic properties of TbMnO3

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=SmOleaga1, Salazar2, Prabhakaran3 et al. 2012Phys. Rev. B576490View full textAdd to dashboardCite

Structural and insulator-to-metal phase transition at 50 GPa in GdMnO3

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Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
View full text Add to dashboard Cite