Spectroscopic and magnetic susceptibility analyses of the 7FJ and 5D4 energy levels of Tb3+(4f8) in TbAlO3

Gruber, John B.; Nash, Kelly; Yow, Raylon M.; Sardar, Dhiraj K.; Valiev, U. V.; Uzokov, Abdulla A.; Burdick, Gary W.

doi:10.1016/j.jlumin.2007.12.041

Cited by 52 publications

(62 citation statements)

References 27 publications

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“…3(b)]. This behavior has been observed in other Tb-based perovskites in this geometry, 29 including films of TbMnO 3 . 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.…”

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confidence: 66%

“…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.…”

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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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confidence: 66%

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confidence: 99%

Effects of Al substitution on the multiferroic properties of TbMnO3

et al. 2012

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“…The lowest lying free-ion term is 7 F 6 (L = 3, S = 3, J = 6), and it is split by the low-symmetry crystal field to 13 singlets. The calculations available for TbAlO 3 of the same P bnm symmetry show that the ground and first excited states of Tb 3+ ion are formed of 90% by two conjugate wavefunctions, |6, +6 + |6, −6 and |6, +6 − |6, −6 , and their eigenenergies differ by only 0.025 meV, representing a quasi-doublet [24]. This specific kind of accidental degeneracy has important consequences.…”

Section: Discussionmentioning

confidence: 99%

Effect of Ising-type Tb^{3 +} ions on the low-temperature magnetism of La, Ca cobaltite

Knı́žek

Jirák

Hejtmánek

et al. 2014

J. Phys.: Condens. Matter

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Abstract. Crystal and magnetic structures of the x = 0.2 member of La 0.8−x Tb x Ca 0.2 CoO 3 perovskite series have been determined from the powder neutron diffraction. Enhancement of the diffraction peaks due to ferromagnetic or cluster glass ordering is observed below T C = 55 K. The moments evolve at first on Co sites, and ordering of Ising-type Tb 3+ moments is induced at lower temperatures by a molecular field due to Co ions. The final magnetic configuration is collinear F x for cobalt subsystem, while it is canted F x C y for terbium ions. The rare-earth moments align along local Ising axes within ab-plane of the orthorhombic P bnm structure. The behavior in external fields up to 70 − 90 kOe has been probed by the magnetization and heat capacity measurements. The dilute terbium ions contribute to significant coercivity and remanence that both steeply increase with decreasing temperature. A remarkable manifestation of the Tb 3+ Ising character is the observation of a low-temperature region of anomalously large linear term of heat capacity and its field dependence. Similar behaviours are detected also for other terbium dopings x = 0.1 and 0.3. PACS numbers: 61.05.fm;Effect of Ising-type Tb 3+ on the magnetism of La,Ca cobaltite 2

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“…In P bnm perovskites with the rare-earth sites of low symmetry C s , the degeneracy is completely removed, yielding 13 singlets. The analysis of optical transitions available for TbAlO 3 of the same P bnm symmetry show that the ground and first excited states of Tb 3+ ion are formed of 90% by two conjugate J = 6 wavefunctions, |6, +6 + |6, −6 and |6, +6 − |6, −6 , and their eigenenergies differ by only 0.025 meV, representing a quasi-doublet [9]. This specific kind of accidental degeneracy has important consequences.…”

Section: +mentioning

confidence: 98%

“…The experiments are confronted with the first-principle calculations of the crystal field and magnetism of Tb 3+ and Dy 3+ ions, located in the P bnm structure on sites of Cs point symmetry. Both these ions exhibit an Ising behavior, which originates in the lowest energy levels, in particular in accidental doublet of non-Kramers Tb 3+ (4f 8 configuration) and in ground Kramers doublet of Dy 3+ (4f 9 ) and it is the actual reason for the non-collinear AFM structures. Very good agreement between the experiment and theory is found.…”

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confidence: 99%

Non-collinear magnetic structures of TbCoO3 and DyCoO3

Knı́žek

Jirák

Novák

2014

Solid State Sciences

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The orthoperovskites TbCoO3 and DyCoO3 with Co 3+ in a non-magnetic low-spin state have been investigated by neutron diffraction down to 0.25 K. Magnetic ordering is evidenced below TN = 3.3 K and 3.6 K, respectively, and the ordered arrangements are of canted type, AxGy for TbCoO3 and GxAy for DyCoO3 in Bertaut's notation. The experiments are confronted with the first-principle calculations of the crystal field and magnetism of Tb 3+ and Dy 3+ ions, located in the P bnm structure on sites of Cs point symmetry. Both these ions exhibit an Ising behavior, which originates in the lowest energy levels, in particular in accidental doublet of non-Kramers Tb 3+ (4f 8 configuration) and in ground Kramers doublet of Dy 3+ (4f 9 ) and it is the actual reason for the non-collinear AFM structures. Very good agreement between the experiment and theory is found. For comparison, calculations of the crystal field and magnetism for other systems with Kramers ions, NdCoO3 and SmCoO3, are also included.

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Spectroscopic and magnetic susceptibility analyses of the 7FJ and 5D4 energy levels of Tb3+(4f8) in TbAlO3

Cited by 52 publications

References 27 publications

Effects of Al substitution on the multiferroic properties of TbMnO3

Effects of Al substitution on the multiferroic properties of TbMnO3

Effect of Ising-type Tb^{3 +} ions on the low-temperature magnetism of La, Ca cobaltite

Non-collinear magnetic structures of TbCoO3 and DyCoO3

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Spectroscopic and magnetic susceptibility analyses of the 7FJ and 5D4 energy levels of Tb3+(4f8) in TbAlO3

Cited by 52 publications

References 27 publications

Effects of Al substitution on the multiferroic properties of TbMnO3

Effects of Al substitution on the multiferroic properties of TbMnO3

Effect of Ising-type Tb3 + ions on the low-temperature magnetism of La, Ca cobaltite

Non-collinear magnetic structures of TbCoO3 and DyCoO3

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Effect of Ising-type Tb^{3 +} ions on the low-temperature magnetism of La, Ca cobaltite