Magnetic and Crystallographic Properties of LnCrO4 (Ln=Nd, Sm, and Dy)

Tezuka, Keitaro; Hinatsu, Yukio

doi:10.1006/jssc.2001.9241

Cited by 27 publications

(34 citation statements)

References 15 publications

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“…Magnetoelastic effects, associated with the polarization of these magnetic ions above T N ; could generate anisotropic strains in the tetragonal lattice. It is worth mentioning that recently a tetragonal-orthorhombic transition has been observed by low-temperature X-ray experiments in the DyCrO 4 compound [8]. This lowtemperature orthorhombic phase presents a space group Imma.…”

Section: Magnetic Propertiesmentioning

confidence: 82%

“…5) are larger than those expected taking into account only the crystal field splitting effects. Recently, a T N value of 25 K has been reported from specific heat measurements [8]. The antiferromagnetic interactions in the Nd 3+ sublattice are induced by the polarization of the antiferromagnetically ordered Cr 5+ ions.…”

Section: Magnetic Propertiesmentioning

confidence: 99%

“…The first member of the vanadates and chromates LaXO 4 , as well as the phosphate derivates where R=La-Tb and the arsenates with R=La-Nd, adopts the monazite-type structure, space group P2 1 =n: The remaining oxides of these families of compounds crystallize with the zircon structural type, space group I4 1 =amd [1][2][3]. The latter structure can be described as built up by edges-sharing chains of distorted (RO 8 ) bisdisphenoids running parallel to the a-axis, being connected one another by (CrO 4 ) tetrahedra, as can be observed in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, local random dynamic strains have been reported in the TmAsO 4 compound above 6.0 K. By contrast, only few studies have been reported concerning the RCrO 4 oxides. In this sense, only recently a tetragonal-orthorhombic transition has been observed by low-temperature X-ray experiments in the DyCrO 4 derivate [8].…”

Section: Introductionmentioning

confidence: 99%

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Structural and magnetic characterization of R CrO 4 oxides ( R =Nd, Er and Tm)

Sáez-Puche

Jiménez

Isasi

et al. 2003

Journal of Solid State Chemistry

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The crystal and magnetic structure of RCrO 4 oxides (R=Nd, Er and Tm) has been studied by owder neutron diffraction. These compounds crystallize with the zircon-type structure, showing tetragonal symmetry, space group I4 1 =amd: In the case of NdCrO 4 , magnetic susceptibility measurements reveal the existence of an antiferromagnetic ordering in which both Cr 5+ and Nd 3+ sublattices are involved. This ordering has been explained on the basis of a propagation vector k ¼ 0 and a collinear structure, described by the symmetry mode A x ; the ordered magnetic moments being 0.62 and 0.66 m B at 2 K for Nd 3+ and Cr 5+ , respectively. Magnetic susceptibility and magnetization measurements reveal that both ErCrO 4 and TmCrO 4 behave as ferromagnetic compounds with a Curie temperature of 15 and 18 K, respectively. Rietveld refinement of the neutron diffraction data for ErCrO 4 yields a collinear magnetic structure described with an F x mode. In the case of the TmCrO 4 oxide, the ferromagnetic sublattices of Tm 3+ and Cr 5+ are aligned antiparallel in the a2b plane, while along the c-axis the magnetic moments point to the same direction. In both compounds, the rather small values obtained for the Er 3+ and Tm 3+ ordered moments compared with the theoretical ones have been attributed to crystal field effects. The differences in the ferromagnetic structure of these compounds have been explained as the result of the higher rare-earth anisotropy of Tm 3+ when compared with Er 3+ , for which no magnetic component is present along the c-direction. r

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Section: Magnetic Propertiesmentioning

confidence: 82%

Section: Magnetic Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structural and magnetic characterization of R CrO 4 oxides ( R =Nd, Er and Tm)

Sáez-Puche

Jiménez

Isasi

et al. 2003

Journal of Solid State Chemistry

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“…ions are involved in the magnetic ordering at 2 K. Figure 4 shows the variation of the magnetic contribution to the specific heat of this oxide between 2 and 30 K in the absence of an applied magnetic field, together with the associated variation of entropy, after having subtracted both the lattice and electronic contributions to the specific heat [5,22]. There is a clear maximum at a temperature of 21.1 K, which corresponds to the Curie temperature previously determined by magnetic susceptibility measurements.…”

Section: +mentioning

confidence: 99%

A combined study of the magnetic properties of GdCrO₄

Jimenez-Melero

Gubbens

Steenvoorden

et al. 2006

J. Phys.: Condens. Matter

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We have performed a detailed study of the magnetic properties of GdCrO 4 at low temperatures by complementary use of different macroscopic and microscopic physical techniques. A ferromagnetic order is established in this oxide below T C = 22 K. The ordered magnetic moments of the Cr 5+ ions are located along the crystallographic c-axis, forming an angle of ≈24• with the ordered moments of the Gd 3+ ions. Surprisingly, only 20% of the Gd 3+ sublattice orders at the Curie temperature of 22 K, while the remaining 80% stays paramagnetic down to around 10 K. This 80% of the Gd 3+ ions may be ascribed to a lowtemperature orthorhombic phase. Moreover, the Gd 3+ magnetic order seems to be triggered by a relatively large transferred hyperfine field coming from the Cr 5+ sublattice.

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A systematic study of rare‐earth ions size‐dependent structural phase transition from monazite to zircon‐type in rare earth chromates using Raman spectroscopy

Ughade

Poddar

2023

J Raman Spectroscopy

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Rare earth chromates (RCrO 4 ) undergo monazite to zircon-type structural phase transition due to a decreased rare-earth ion size. They also exhibit an intermediate mixed phase. However, there is no systematic study on the influence of structural distortion on their phononic behavior, which is quite sensitive to subtle environmental variations. A change in the room temperature phononic spectrum was studied in the family of RCrO 4 compounds, where R was varied from La to Yb using Raman modes. With an increase in the atomic number from Nd to Yb for zircon-type phases, the external translational and rotational modes were observed to shift towards lower and higher wavenumbers, respectively. At the same time, all internal vibrational modes shifted towards higher phonon energies. A comparison between Raman modes for monazite, intermediate, and zircon-type RCrO 4 phases showed a gradual shift in the internal modes towards a higher wavenumber. The confirmation of the change in Raman modes with the decreasing radius was found by comparing the rare-earth elements in DyCrO 4 and LaCrO 4 with non-rare-earth elements in YCrO 4 . K E Y W O R D Smonazite-type, Raman spectroscopy, rare earth chromates (RCrO 4 ), YCrO 4 , zircon type

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Magnetic and Crystallographic Properties of LnCrO4 (Ln=Nd, Sm, and Dy)

Cited by 27 publications

References 15 publications

Structural and magnetic characterization of R CrO 4 oxides ( R =Nd, Er and Tm)

Structural and magnetic characterization of R CrO 4 oxides ( R =Nd, Er and Tm)

A combined study of the magnetic properties of GdCrO₄

A systematic study of rare‐earth ions size‐dependent structural phase transition from monazite to zircon‐type in rare earth chromates using Raman spectroscopy

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Magnetic and Crystallographic Properties of LnCrO4 (Ln=Nd, Sm, and Dy)

Cited by 27 publications

References 15 publications

Structural and magnetic characterization of R CrO 4 oxides ( R =Nd, Er and Tm)

Structural and magnetic characterization of R CrO 4 oxides ( R =Nd, Er and Tm)

A combined study of the magnetic properties of GdCrO4

A systematic study of rare‐earth ions size‐dependent structural phase transition from monazite to zircon‐type in rare earth chromates using Raman spectroscopy

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A combined study of the magnetic properties of GdCrO₄