Non-collinear magnetic structures of TbCoO3 and DyCoO3

Knı́žek, K.; Jirák, Z.; Novák, P.

doi:10.1016/j.solidstatesciences.2013.12.001

Cited by 41 publications

(20 citation statements)

References 15 publications

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“…It is expected that crystal-field energy levels split in three Kramers doublets the 4f 5 electronic configuration of Sm 3+ in the Cs crystal-field symmetry of the Sm 3+ sites. 50 We also found the same in our recent measurements of SmNiO 3 and SmFeO 3 concluding that it is reflection of an intrinsic property of Sm at the orthorhombic lattice site. A lack of crystal field excitations might relate to the near canceling of the spin and orbital moments found for isomorphous SmCoO 3 in the 6 H 5/2 multiplet (L=5, S=5/2, J=L -S=5/2, g L =2/7), which is manifested by low g j' factor of the pseudospins in the ground Kramers doublet.…”

Section: Ii) Smcro3supporting

confidence: 87%

Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

Massa¹,

Holldack²,

Sopracase³

et al. 2018

Journal of Magnetism and Magnetic Materials

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We report on THz absorption spectroscopy combined with high magnetic fields of polycrystalline RCrO 3 (R=Pr, Sm, Er) aiming understanding spin wave resonances at their low temperature magnetic phases.Our measurements show that the temperature , and the implicit anisotropies at which the Cr 3+ spin reorientation at T SR takes place, are determinant on the ferromagnetic-like (FM) and the antiferromagnetic-like (AFM) spin modes being optically active. It is found that they are dependent on Rare Earth 4f moment and ion size.We also studied temperature and field dependence of crystal field levels in the same spectroscopic region. Pr 3+ non-Kramers emerges at 100 K and Zeeman splits. An observed absence of spin wave resonances in PrCrO 3 is attributed to Pr 3+ remaining paramagnetic. In SmCrO 3 near cancelation of the spin and orbital moments is proposed as the possible reason for not detecting Sm 3+ ground state transitions. Here, the FM and AFM resonant modes harden when the temperature decreases and split linearly on applied fields at 5 K and below. In ErCrO 3 the Er 3+ Kramers doublet becomes active at about the T SR onset. Each line further experiences Zeeman splitting under magnetic fields while an spin reversal induced by a ~2.5 T field, back to the Γ 4 (F z ) from the Γ 1 phase at 2 K, produces a secondary splitting.The 5 K AFM and FM excitations in ErCrO 3 have a concerted frequencyintensity temperature dependence and a shoulder pointing to the Er 3+ smaller ion size also disrupting the two magnetic sublattice approximation .Both resonances reduce to one when the temperature is lowered to 2 K in the Γ 1 representation. Our findings have important implications on the complex interplay in the magneto-electrodynamics associated with the 3 Rare-Earth 4f -3d transition metal spin coupling and the structural A site instabilities in perovskite multiferroics.

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Section: Ii) Smcro3supporting

confidence: 87%

Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

Massa¹,

Holldack²,

Sopracase³

et al. 2018

Journal of Magnetism and Magnetic Materials

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“…The transition temperature T N4 ≈ 3.7 K coincides with the AF ordering temperature of terbium in other perovskites such as TbCoO 3 (T N = 3.3 K [22]). Interestingly, the absence of moments at the B site in TbCoO 3 (in the ground state Co 3+ atoms are in LS, S = 0) indicates that (apart from anisotropy terms) J Tb-Tb must be very similar in the cobaltite and in Tb 2 MnNiO 6 .…”

Section: B Successive Magnetic Phases With Magnetic Order At a And B Sites Below 15 Ksupporting

confidence: 60%

Magnetic inversion symmetry breaking and spin reorientation in Tb2MnNiO6 : A polar strong ferromagnet

et al. 2019

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We report a description and comprehensive study on four successive magnetic transitions in ferromagnetic Tb 2 MnNiO 6 double perovskite. In the ground state (P2 1), the moments of magnetic A and B sites order according to different nonpolar magnetic modes, but the coupling between them generates an overall polar symmetry which makes this oxide potentially multiferroic due to magnetic trilinear coupling, and therefore ferromagnetic and ferroelectric in its ground state. Its macroscopic magnetization is large (5 μ B /f.u) and not related to a weak ferromagnetic component induced by Dzyaloshinskii-Moriya interaction. However, a sharp and severe spin reorientation of the ferromagnetic transition-metal moments has been observed which opens the door to the magnetic switching of the ferroelectric state in this perovskite, and conversely to the control of the magnetization direction by electrical fields applied parallel to b. We also anticipate that in this material the direction of the magnetization (towards c/a) could be used as the key to switch the polar/nonpolar (ferroelectric/antiferroelectric) transformation.

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“…Detection of UV Light. The most studied materials for detecting UV radiation are wide-bandgap semiconductors like SnO 2 , Nb 2 O 5 , TiO 2 , ZnO, and ZnS, among others, which have been applied in photoconductive cells from time ago [30][31][32]. A key parameter to be considered for this application is the bandgap energy; that for these materials is in the range 3.2 to 4.9 eV.…”

Section: Photocurrent Properties Of Dycoomentioning

confidence: 99%

Novel UV Sensing and Photocatalytic Properties of DyCoO₃

et al. 2019

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Oxides with the perovskite type structure of formula LnCoO 3 , where Ln is a rare earth element, have unique physical and chemical properties. These materials are applied in catalysis, gas sensors, and electrodes for solid oxide fuel cells, among others. In this work, single-phase DyCoO 3 was obtained at 900 ∘ C using the solution-polymerization method. The microstructure of this material corresponds to a dendritic-type shape, with grain size between 0.2 and 8 m and abundant porosity. The ultraviolet (UV) sensing characterization was performed on sintered pellets made with the as-prepared DyCoO 3 powder. The UV source was a light emitting diode (LED) of wavelength ( ) of 365 nm. The detection of this radiation, with constant optical irradiance (E e ), produced uniform and reproducible response patterns. When E e was increased, the graphs revealed a quantitative detection of the light. Analogous results were obtained using light of larger wavelengths: = 400, 449, and 642 nm. The graphs display a decrease on the variation of the photocurrent by increasing , corresponding to a decrease on the energy of the incoming photons. On the other hand, the photocatalytic decomposition of malachite green under UV radiation was investigated using powder of DyCoO 3 . The results show a decrease of the absorbance by increasing the UV exposure time, indicating the degradation of the dye. Since DyCoO 3 is a p-type semiconductor material, the generation of electrical charge carriers under UV radiation explains its photocurrent and photocatalytic properties. In general, these properties can be applied in UV sensors to prevent skin cancer, photoconductive materials for solar photocells, and photocatalysis to decompose organic dyes.

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Non-collinear magnetic structures of TbCoO3 and DyCoO3

Cited by 41 publications

References 15 publications

Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

Magnetic inversion symmetry breaking and spin reorientation in Tb2MnNiO6 : A polar strong ferromagnet

Novel UV Sensing and Photocatalytic Properties of DyCoO₃

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Non-collinear magnetic structures of TbCoO3 and DyCoO3

Cited by 41 publications

References 15 publications

Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

Magnetic inversion symmetry breaking and spin reorientation in Tb2MnNiO6 : A polar strong ferromagnet

Novel UV Sensing and Photocatalytic Properties of DyCoO3

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Product

Resources

About

Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

Identification of spin wave resonances and crystal field levels in simple chromites RCrO3 (R = Pr, Sm, Er) at low temperatures in the THz spectral region

Novel UV Sensing and Photocatalytic Properties of DyCoO₃