Spin ordering and physical properties of NaPrFeWO6 and NaSmFeWO6 with polar double perovskite structure

Blasco, Javier; Rodríguez-Velamazán, J. A.; Subı́as, G.; García-Muñoz, J. L.; Stankiewicz, Jolanta; Garcı́a, J.

doi:10.1016/j.actamat.2019.06.045

Cited by 15 publications

(10 citation statements)

References 38 publications

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“…The estimated polarizations are ∼28 μC/cm 2 for NaErCoWO 6 , ∼27 μC/cm 2 for NaTmCoWO 6 , ∼26 μC/cm 2 for NaYbCoWO 6 , ∼23 μC/cm 2 for NaLuMnWO 6 , and 26 μC/cm 2 for NaLuCoWO 6 . The obtained polarization values are of the same order of magnitude as similar doubly ordered perovskite values. ,, …”

Section: Resultssupporting

confidence: 72%

“…The obtained polarization values are of the same order of magnitude as similar doubly ordered perovskite values. 24,27,38 4. CONCLUSIONS In this study, we have reported the multiferroic properties of doubly ordered perovskites NaLnCoWO 6 (Ln = Er, Tm, Yb, and Lu) and NaLuMnWO 6 prepared under high-pressure and high temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Interestingly, the unusual layer ordering of A-site cations is stabilized by highly charged W 6+ -cation through second-order Jahn–Teller distortion (SOJT) . Multiferroicity is expected in these compounds because of the polar structure and the presence of magnetic cation at the B-site. − The magnetoelectric coupling is realized below the magnetic ordering temperature of other polar oxides M 2 Mo 3 O 8 (M = Mn, Fe, Co, and Ni) CaBaCo 4 O 7 , GaFeO 3 , Ni 3 TeO 6, DyFeWO 6 . − In these materials, the inversion symmetry is absent at all of the temperatures, and the presence of a magnetic cation often means that the material undergoes long-range magnetic ordering. Thus, this fulfills the imperative conditions of the simultaneous breaking of spatial inversion and time-reversal symmetry for multiferroicity.…”

Section: Introductionmentioning

confidence: 99%

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Switchable and Nonswitchable Polarization in Doubly Ordered Perovskites NaLnCoWO₆ (Ln = Er, Tm, Yb, and Lu)

Panda

Sundaresan

2021

J. Phys. Chem. C

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We report the multiferroic properties of doubly ordered perovskites NaLnCoWO 6 (Ln = Er, Tm, Yb, and Lu) and NaLuMnWO 6 synthesized under high-pressure (4.5 GPa) and high-temperature (1000 °C) conditions. Analysis of the powder Xray diffraction data reveals that these compounds crystallize in the polar monoclinic (P2 1 ) structure. These compounds are derived from the ABO 3 perovskite structure, where A-site cations (Na and Ln) exhibit layer ordering and B-site ions (M = Co or Mn and W) undergo commonly observed rock-salt ordering accompanied by a − a − c + octahedral tilting. All these materials, characterized by magnetic and dielectric measurements, reveal antiferromagnetic ordering (T N ∼ 6−8 K) accompanied by a dielectric anomaly. Furthermore, pyroelectrical current measurements show a nonswitchable polarization below T N for NaLnCoWO 6 (Ln = Er, Tm, and Yb) and NaLuMnWO 6 . In contrast, the polarization can be switched in NaLuCoWO 6 by changing the direction of the electric field (E) indicating the ferroelectric nature of this compound. The appearance of polarization below the magnetic ordering temperature (T N ) confirmed the magnetoelectric coupling of these compounds.

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Switchable and Nonswitchable Polarization in Doubly Ordered Perovskites NaLnCoWO₆ (Ln = Er, Tm, Yb, and Lu)

Panda

Sundaresan

2021

J. Phys. Chem. C

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“…The dipoles are oriented along the a axis and the main polar displacement comes from shifts of the apical oxygens in the MnO 6 octahedra. If the polar structure of SBMO is confirmed, it would clearly show how the combination of laminar A-site and rocksalt B-site orderings in the perovskite cell stabilizes noncentrosymmetric structures through the trilinear coupling mechanism [9,25].…”

Section: Introductionmentioning

confidence: 99%

Symmetry mode analysis of distorted polar/nonpolar structures in A -site ordered SmBaMn2O6 perovskite

et al. 2021

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We present a comprehensive structural study of the charge-orbital ordering and magnetic phase transitions observed in the A-site ordered SmBaMn 2 O 6 perovskite combining synchrotron radiation x-ray powder diffraction and symmetry-adapted modes analysis. In SmBaMn 2 O 6 , successive phase transitions in charge, spin, and lattice degrees of freedom take place with decreasing temperature at T CO1 ≈ 380 K, T CO2 ≈ 190 K, and T N ≈ 250 K. The main difference between the two charge-ordered phases concerns the stacking sequence along the c axis, which is double for the high temperature charge-ordered phase and has led to controversy in the literature. We show that both charge-ordered phases are pseudosymmetric with respect to the ideal undistorted tetragonal structure of A-site ordered RBaMn 2 O 6 perovskites and lead to two nonequivalent Mn sites. However, the charge segregation stabilizes at about 0.35e − in the low temperature charge-ordered phase, clearly below the nominal separation of one charge unit between Mn 3+ and Mn 4+ and undergoes a prominent increase in the high temperature charge-ordered phase when warming above ≈250 K. The two Mn sites are anisotropic in both charge-ordered phases but the analysis of the active modes discloses that only the low temperature charge-ordered phase displays a Jahn-Teller-like distortion for one of the Mn sites. In addition, this low temperature charge-ordered phase has polar symmetry compatible with ferroelectricity along the a axis.

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“…This value is in good agreement with the earlier calculated ferroelectric polarization for doubly ordered perovskites NaLaMnWO 6 , NaPrFeWO 6 , and NaSmFeWO 6 . 16,48 Since the polarization calculation involves atomic displacements, it is better to use structural details from neutron data. We have calculated the polarization from PXRD structural details for the other compounds (Pr, Nd, Sm, and Eu−Tb).…”

Section: Dielectric Studiesmentioning

confidence: 99%

Structural, Magnetic, and Electrical Properties of Doubly Ordered Perovskites NaLnNiWO₆ (Ln = La, Pr, Nd, Sm, Eu, Gd, and Tb)

Orlandi

Manuel

et al. 2021

J. Phys. Chem. C

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We report the structural, magnetic, and electrical properties of a new family of doubly ordered perovskites NaLnNiWO6 (Ln = La, Pr, Nd, Sm, Eu, Gd, and Tb), synthesized at high-pressure (4.5 GPa) and high-temperature (1000 °C) conditions. These materials crystallize in the monoclinic structure with the polar space group P21 as revealed by neutron diffraction (Ln = La), X-ray diffraction, and second-harmonic-generation (SHG) studies. These compounds exhibit a combined layered ordering of A-site cations and rock-salt ordering of B-site cations with octahedral tilting, which breaks the inversion symmetry and results in a polar structure. The magnetic and heat capacity measurements reveal the antiferromagnetic order of Ni2+ ion moments in the temperature range of 23–30 K, depending on the Ln ion. Analysis of neutron powder diffraction data for the La compound reveals that the Ni2+ spins couple antiferromagnetically along the a- and c-directions and ferromagnetically along the b-axis, consistent with the propagation vector, k = (1/2, 0, 1/2). In contrast to the compounds with smaller lanthanide ions (Ln = Y, Dy, Ho, and Yb), these compounds do not exhibit measurable electric polarization at T N but show a dielectric anomaly.

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Spin ordering and physical properties of NaPrFeWO6 and NaSmFeWO6 with polar double perovskite structure

Cited by 15 publications

References 38 publications

Switchable and Nonswitchable Polarization in Doubly Ordered Perovskites NaLnCoWO₆ (Ln = Er, Tm, Yb, and Lu)

Switchable and Nonswitchable Polarization in Doubly Ordered Perovskites NaLnCoWO₆ (Ln = Er, Tm, Yb, and Lu)

Symmetry mode analysis of distorted polar/nonpolar structures in A -site ordered SmBaMn2O6 perovskite

Structural, Magnetic, and Electrical Properties of Doubly Ordered Perovskites NaLnNiWO₆ (Ln = La, Pr, Nd, Sm, Eu, Gd, and Tb)

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Spin ordering and physical properties of NaPrFeWO6 and NaSmFeWO6 with polar double perovskite structure

Cited by 15 publications

References 38 publications

Switchable and Nonswitchable Polarization in Doubly Ordered Perovskites NaLnCoWO6 (Ln = Er, Tm, Yb, and Lu)

Switchable and Nonswitchable Polarization in Doubly Ordered Perovskites NaLnCoWO6 (Ln = Er, Tm, Yb, and Lu)

Symmetry mode analysis of distorted polar/nonpolar structures in A -site ordered SmBaMn2O6 perovskite

Structural, Magnetic, and Electrical Properties of Doubly Ordered Perovskites NaLnNiWO6 (Ln = La, Pr, Nd, Sm, Eu, Gd, and Tb)

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Switchable and Nonswitchable Polarization in Doubly Ordered Perovskites NaLnCoWO₆ (Ln = Er, Tm, Yb, and Lu)

Switchable and Nonswitchable Polarization in Doubly Ordered Perovskites NaLnCoWO₆ (Ln = Er, Tm, Yb, and Lu)

Structural, Magnetic, and Electrical Properties of Doubly Ordered Perovskites NaLnNiWO₆ (Ln = La, Pr, Nd, Sm, Eu, Gd, and Tb)