Ga substitution as an effective variation of Mn-Tb coupling in multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>TbMnO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Prokhnenko, O.; Aliouane, N.; Feyerherm, R.; Dudzik, E.; Wolter, A. U. B.; Maljuk, A.; Kiefer, K.; Argyriou, D. N.

doi:10.1103/physrevb.81.024419

Cited by 26 publications

(25 citation statements)

References 31 publications

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“…The first possibility implies the linear combination of three Irreps, 1 ⊕ 3 ⊕ 4 (see Table IV). The refinement of a G z component in phase with the y component yielded a value of m z = 0.49 (17) in accordance with the weak contribution of this component to the magnetic structure.…”

Section: Neutron Diffraction Under An External Magnetic Fieldmentioning

confidence: 65%

“…However, small substitutions have little effect on the magnetoelectric properties of the Mn sublattice but strongly affect the magnetic ordering of Tb moments indicating that such an ordering comes from the competition between J Mn-Tb and the direct coupling between Tb moments, J Tb-Tb . 17 In order to elucidate the effects of Mn dilution on the properties of TbMnO 3 , we report here results obtained for the partial replacement of Mn 3+ by Al 3+ . This substitution is isovalent but the 17% difference in ionic size of Mn 3+ and Al 3+ (the ionic radii are 0.535 and 0.645Å for Al 3+ and Mn 3+ , respectively) 20 may lead to a local disturbance of the lattice around the Al 3+ ions to relax the strain produced by a size mismatch.…”

Section: Introductionmentioning

confidence: 99%

“…15,16 The importance of J Mn-Tb has been tested by the substitution of Mn with a nonmagnetic cation. [17][18][19] This substitution is detrimental to the Mn magnetic ordering that disappears for x ∼ 0.3 well above the percolation limit for a metal with octahedral coordination. However, small substitutions have little effect on the magnetoelectric properties of the Mn sublattice but strongly affect the magnetic ordering of Tb moments indicating that such an ordering comes from the competition between J Mn-Tb and the direct coupling between Tb moments, J Tb-Tb .…”

Section: Introductionmentioning

confidence: 99%

“…The shape of the peak concurs with the strong anomaly observed in TbMnO 3 single crystals with electric field parallel to the c axis (E c). 1,17 The influence of an external H on the ε was also studied in TbMn 0.9 Al 0.1 O 3 and the results are displayed in Fig. 4(d).…”

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confidence: 99%

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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: Neutron Diffraction Under An External Magnetic Fieldmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Effects of Al substitution on the multiferroic properties of TbMnO3

et al. 2012

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“…This effect reveals the importance of Mn-Tb coupling in the multiferroic properties. Perturbation of the Mn sublattice by partial replacing with non-magnetic cations [9,10] or Co [11] is very detrimental for the Mn-Tb coupling and hence, for multiferroic properties. In TbMn 1-x Co x O 3 compounds, small replacements have a dramatic effect as this substitution is not isovalent because the formal equilibrium Mn 3+ -Co 3+ !…”

Section: Introductionmentioning

confidence: 99%

Metamagnetic transition in Tb₂MnCoO₆

Cuartero

Blasco

Garcı́a

et al. 2013

EPJ Web of Conferences

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Abstract. The magnetic properties of the double perovskite Tb 2 MnCoO 6 have been studied. The refinement of neutron pattern reveals antisite defects in the ordered array of Mn 4+ and Co 2+ cations. The temperature dependence of dc magnetization exhibits a magnetic transition at ~100 K with a strong irreversibility between ZFC and FC conditions. The ac magnetic susceptibility curve shows a strong peak at the same temperature whose position and intensity slightly depends on the field frequency. These features are typical of a spin-glasslike phase but neutron diffraction shows the onset of a ferromagnetic contribution at the same temperature. Ferromagnetism in this sample is associated to superexchange interaction between Mn 4+ and Co 2+ cations. The most striking property of Tb 2 MnCoO 6 is the presence of field induced transitions. This is observed in the magnetic hysteresis loops below 100K. The metamagnetic transition was studied by powder neutron diffraction at different temperatures and magnetic fields. At low temperature, the magnetic field induces a long range magnetic ordering of Tb 3+ moments in the ab-plane. The magnetic peaks of Tb moments at 30 kOe vanish at 60 K. Above this temperature, the metamagnetic transition is ascribed to the field induced transition from short to long range ferromagnetic ordering in the Mn-Co sublattice.

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