Metamagnetism in TbAlO3

Holmes, Lewis M.; Sherwood, R. C.; Uitert, L. G. Van

doi:10.1063/1.1656310

Cited by 54 publications

(34 citation statements)

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“…27,28 It is noteworthy that the C x F y symmetry (H b) has been experimentally confirmed in the present work for TbMn 0. . These values are smaller than the theoretical one (9 μ B ) but agree very well with the value experimentally found in related perovskites such as TbAlO 3 or TbCoO 3 .…”

supporting

confidence: 54%

“…30 Therefore, the temperature dependence of magnetic susceptibility for these compounds does not follow a simple Curie-Weiss law for H c since the interaction of Tb 3+ with a crystal field having Cs symmetry leads to an anisotropy in the magnetic properties. 27,29,31 The magnetic susceptibility in TbAlO 3 with H c was explained in terms of a significant contribution from excited states located in the 7 F 6 manifold, which become thermally populated as the temperature is increased. 29 A similar feature is expected for TbMnO 3 and the mixing of excited states with the ground state associated with the Van Vleck mechanism leads to the nonlinear dependence of magnetization on temperature observed in the inset of Fig.…”

mentioning

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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confidence: 54%

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confidence: 99%

Effects of Al substitution on the multiferroic properties of TbMnO3

et al. 2012

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“…Similar geometric extinction can be inferred for the (100) reflection and the F x C y configuration. In spite of this limitation, the rest of the neutron pattern nicely agrees with the proposed mixture of configurations which is already observed in related Tb-perovskites [16,17] so we can hypothesize that metamagnetic transitions al low temperature comes from the field induced transition of the Tb 3+ moments within the xy-plane following two main directions [15]. vectors k).…”

Section: Results and Conclusionsupporting

confidence: 61%

“…The high field phase adopted by Tb 3+ moments can be described as C x F y in the Bertaut's notation [14]. Presumably, the ordering adopted for H||a would be F x C y as observed in related compounds [17]. In the present sample, both configurations can also be present and, in addition, polarization of Tb moments along the z-direction for H||c cannot be discarded.…”

Section: Methodsmentioning

confidence: 84%

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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“…Similar meta-magnetic rare earth behavior is reported for the isostructural TbAlO 3 compound. 26 One marks out that the magnetization is not saturated up to 14 T and the extracted value of the Tb-moment, ∼ 6.5 µ B , is rather low. All these suggest that the Tb moments do not become fully ferromagnetically ordered above 2 T. Instead, because of their strong Ising anisotropy, they presumably arrange in a noncollinear (F x C y 0) pattern (Bertaut notation) 27 with m x ∼ 6.5 µ B .…”

Section: B Magnetic and Dielectric Propertiesmentioning

confidence: 99%

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

et al. 2010

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Ga for Mn substitution in multiferroic TbMnO3 has been performed in order to study the influence of Mn-magnetic ordering on the Tb-magnetic sublattice. Complete characterization of TbMn1−xGaxO3 (x = 0, 0.04, 0.1) samples, including magnetization, impedance spectroscopy, and x-ray resonant scattering and neutron diffraction on powder and single crystals has been carried out. We found that keeping the same crystal structure for all compositions, Ga for Mn substitution leads to the linear decrease of T Mn N and τ Mn , reflecting the reduction of the exchange interactions strength JMn−Mn and the change of the Mn-O-Mn bond angles. At the same time, a strong suppression of both the induced and the separate Tb-magnetic ordering has been observed. This behavior unambiguously prove that the exchange fields J Mn−Tb have a strong influence on the Tb-magnetic ordering in the full temperature range below T Mn N and actually stabilize the Tb-magnetic ground state.

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Metamagnetism in TbAlO3

Cited by 54 publications

References 4 publications

Effects of Al substitution on the multiferroic properties of TbMnO3

Effects of Al substitution on the multiferroic properties of TbMnO3

Metamagnetic transition in Tb₂MnCoO₆

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

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Metamagnetism in TbAlO3

Cited by 54 publications

References 4 publications

Effects of Al substitution on the multiferroic properties of TbMnO3

Effects of Al substitution on the multiferroic properties of TbMnO3

Metamagnetic transition in Tb2MnCoO6

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

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Metamagnetic transition in Tb₂MnCoO₆