Evidence of spin-glass like ordering and exchange bias effect in antisite-disordered nanometric La 1.5 Ca 0.5 CoMnO 6 double perovskite

Sahoo, R. C.; Paladhi, D.; Nath, T. K.

doi:10.1016/j.jmmm.2017.04.022

Cited by 22 publications

(4 citation statements)

References 34 publications

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“…There are many DPs reported with glassy states due to ASD e.g. La 1.5 Ca 0.5 CoMnO 6 [122], La 1.8 Pr 0.2 CoFeO 6 [5], Tb 2 CoMnO 6 [123], La 2 MnNiO 6 [118], Pr 2 CoFeO 6 [95], Lu 2 MnNiO 6 [124], Yb 2 CoMnO 6 [125], LaSrCoFeO 6 [126], Gd 2 CoMnO 6 [4], La 2 CoMnO 6 [127], Ho 2 CoMnO 6 [128], Sr 2 FeCoO 6 [129], SrLaGaRuO 6 [130], Sr 2 FeTiO 6 [131], etc.…”

Section: Sgmentioning

confidence: 99%

B-site order/disorder in A₂BB′O₆ and its correlation with their magnetic property

Alam

Chatterjee²

2023

J. Phys.: Condens. Matter

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The disorder in any system affects their physical behaviour. In this scenario, we report the possibility of disorder in A2BB'O6 oxides and their effect on different magnetic properties. These systems show anti-site disorder by interchanging B and B' elements from their ordered position and giving rise to anti-phase boundary. The presence of disorder leads to a reduction in saturation magnetization and magnetic transition temperature. The disorder prevents the system from sharp magnetic transition which originates short-range clustered phase (or Griffiths phase) in the paramagnetic region just above the long-range magnetic transition temperature. Further, we report that the presence of anti-site disorder and anti-phase boundary, A2BB'O6 oxides give different interesting magnetic phases like metamagnetic transition, spin-glass, exchange bias, magnetocaloric effect, magnetodielectric, magnetoresistance, spin-phonon coupling, etc.

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Section: Sgmentioning

confidence: 99%

B-site order/disorder in A₂BB′O₆ and its correlation with their magnetic property

Alam

Chatterjee²

2023

J. Phys.: Condens. Matter

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“…We also observed two small peaks beside these two peaks which are due to satellite correction and are good agreement with literature. [33,34,35]From the peak position we analyzed Mn cations is present in +4 oxidation state.…”

Section: X-ray Photo-electron Spectroscopy (Xps)mentioning

confidence: 99%

Spin-phonon coupling and dielectric spectroscopy in nano-crystalline Pr2CoMnO6 double perovskite manganite

Bhatti

2021

Physica B: Condensed Matter

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In this paper, we present the spin-phonon coupling and dielectric response of nano-crystalline Pr 2 CoMnO 6 employing Raman and dielectric spectroscopic study. Pr 2 CoMnO 6 is a manganite compound , it undergoes a paramagnetic to ferromagnetic (PM-FM) phase transition around T c ∼172 K. Temperature-dependent Raman scattering experiment is carried out across T c to study the spin-phonon behavior in this material. The results from Raman study reveal an obvious softening of the phonon mode involving stretching vibrations of the (Co/Mn)O 6 octahedra in ferromagnetic temperature regions, indicating a close correlation between magnetism and lattice in Pr 2 CoMnO 6 and conform the spin phonon coupling. Further, we have carried out detailed study on dielectric response, impedance spectroscopy, electric modulus and AC conductivity of Pr 2 CoMnO 6 ceramics in the temperature range of 20 K -300 K and frequency range of 1kHz -5.5MHz. We found Pr 2 CoMnO 6 shows strong frequency dependence with large dispersion and large dielectric constant. It is found that thermally activated relaxation mechanism is involve and material is deviated from Debye's model which is confirmed by Nyquist plot and complex modules behavior.

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“…A relatively small intensity satellite peak is also been seen at higher energy side of Mn 2p 3/2 peak. [27,[34][35][36][37][38] Fig. 2c shows that the Gd 4d core level spectra, which split into two spin-orbital split peaks Gd 4d 5/2 and Gd 4d 3/2 are located at 142.6 and 148.03 eV respectively (see figure).…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Suppression of magnetic phase transition at high magnetic field and non-Debye's nature of nano-crystalline Gd$_2$CoMnO$_6$: a detail study of physical properties

Bhatti,

Mahato

et al. 2020

Preprint

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Structural, magnetization, phonon behavior, and dielectric response of nanocrystalline Gd2CoMnO6 have been presented in this paper. The study shows that the material crystallizes in P21/n phase group of monoclinic crystal structure. XPS measurement shows Co 2+ and Mn 4+ oxidation states are present in the sample. Magnetization study reveals that sample undergoes a ferromagnetic ordering of Co 2+ and Mn 4+ magnetic ions around Tc ∼132 K. However we have seen that with the application of external magnetic field the phase transition is largely suppressed. Raman study reveals the presence spin-phonon coupling in Gd2CoMnO6. Dielectric study reveals that the sample shows large dielectric constant and strong dispersion in mid frequency range. The dielectric loss shows there are two relaxation processes present in the material with different relaxation time and which are driven by thermally activated relaxation mechanics. Further, the Nyquist plot and AC conductivity study shows that this sample is non-Debye's in nature.

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Evidence of spin-glass like ordering and exchange bias effect in antisite-disordered nanometric La 1.5 Ca 0.5 CoMnO 6 double perovskite

Cited by 22 publications

References 34 publications

B-site order/disorder in A₂BB′O₆ and its correlation with their magnetic property

B-site order/disorder in A₂BB′O₆ and its correlation with their magnetic property

Spin-phonon coupling and dielectric spectroscopy in nano-crystalline Pr2CoMnO6 double perovskite manganite

Suppression of magnetic phase transition at high magnetic field and non-Debye's nature of nano-crystalline Gd$_2$CoMnO$_6$: a detail study of physical properties

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Evidence of spin-glass like ordering and exchange bias effect in antisite-disordered nanometric La 1.5 Ca 0.5 CoMnO 6 double perovskite

Cited by 22 publications

References 34 publications

B-site order/disorder in A2BB′O6 and its correlation with their magnetic property

B-site order/disorder in A2BB′O6 and its correlation with their magnetic property

Spin-phonon coupling and dielectric spectroscopy in nano-crystalline Pr2CoMnO6 double perovskite manganite

Suppression of magnetic phase transition at high magnetic field and non-Debye's nature of nano-crystalline Gd$_2$CoMnO$_6$: a detail study of physical properties

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B-site order/disorder in A₂BB′O₆ and its correlation with their magnetic property

B-site order/disorder in A₂BB′O₆ and its correlation with their magnetic property