Competing short-range magnetic correlations, metamagnetic behavior and spin-phonon coupling in Nd2CoMnO6 double perovskite

Das, Ranjana R.; Lekshmi, P. Neenu; Das, Sayantani; Santhosh, P. N.

doi:10.1016/j.jallcom.2018.09.171

Cited by 35 publications

(19 citation statements)

References 31 publications

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“…Figure 6 shows Δ as a function of ( ( )/ 0 ) 2 as related by the equation (5). As observed in other perovskite compounds, 35,[52][53][54] In the case of (1) and (3) phonons (Figure 6(a) and (b), respectively), the linear behavior appears around 110 K, where Δ increases linearly with the square of magnetization. However, it can be noted that below 80 K the linear response slightly changes for both phonons.…”

Section: Resultsmentioning

confidence: 58%

Spin–phonon coupling in monoclinic BiCrO3

Araújo

Arévalo‐López

Santos

et al. 2020

Journal of Applied Physics

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Monoclinic BiCrO3, synthesized at high pressure and high temperature, presents interesting properties with anomalies of magnetic origin observed around 110 and 80 K, which are associated, respectively, with the rising of a G-type antiferromagnetic structure and the spin reorientation along one of the monoclinic axes. In this study, we report a strong spin-phonon coupling in monoclinic BiCrO3 observed by Raman spectroscopy. The renormalization of the phonon energy confirms the coupling with the magnetic orderings. Interestingly, not all the phonons exhibiting this effect ate the temperature of the spin reorientation evidence the G-type antiferromagnetic ordering at 80 K. A wellstablished models based on the mean-field theory, previously applied to other perovskite compounds, was used to analyze the spin-phonon coupling showing different associated with each magnetic phase.

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Section: Resultsmentioning

confidence: 58%

Spin–phonon coupling in monoclinic BiCrO3

Araújo

Arévalo‐López

Santos

et al. 2020

Journal of Applied Physics

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“…So it is seen that the obtained saturation magnetization value is much lower than the theoretically obtained value. This decrease in the moment is a clear impact of ASD present in our sample [68] because ASD creates ABPs, which are also responsible for reducing the saturation magnetization value [48,81,67]. The presence of strong magnetic pinning force with disorder restricts the moments to align along the field direction [66].…”

Section: Isothermal Magnetizationmentioning

confidence: 96%

“…7(b) depicts that at low temperatures, our sample exhibits large coercivity. This is ascribed to the pinning of FM domain wall due to ASD defects and magnetocrystalline anisotropy of the sublattices [67]. Again at high temperatures the thermal energy supresses the magnetocrystalline anisotropy energy, and the domain wall starts moving, as a result, the coercivity decreases [67].…”

Section: Isothermal Magnetizationmentioning

confidence: 99%

“…Zero field cooled loop shift is not noticeable in this compound which exclude the possibility of occurrence of spontaneous EB effect. In terms of loop shift along the field direction as well as the magnetization direction, the EB field is defined by the average of the zero magnetization intercept [ ] where H C1 and H C2 are the left and right coercive field [67]. Similarly M r1 and M r2 are the positive and negative remanent magnetization.…”

Section: Exchange Bias Effectmentioning

confidence: 99%

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The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y$_2$CoMnO$_6$ double perovskite

Khan,

Rajput,

Anas

et al. 2022

Preprint

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Combining experimental investigations and first-principles DFT calculations, we report physical and magnetic properties of Gd doped Y 2 CoMnO 6 (YCMO) double perovskite (DP), which are strongly influenced by antisite-disorder(ASD)-driven spin configurations. On Gd doping, Co and Mn ions are present in mixed valence (Co 3+ , Co 2+ , Mn 3+ and Mn 4+ ) states. Multiple magnetic transitions have been observed: i) field-induced paramagnetic to ferromagnetic transition at T C =95.5 K, ii) antiferromagnetic transition at T N =47 K due to 3d − 4f polarisation, iii) change in magnetization below T ≤20 K, primarily originating from Gd ordering, as revealed from our DFT calculations. AC susceptibility measurement confirms the absence of any spin-glass or cluster-glass phases in this material. A significantly large exchange bias (EB) effect (H EB =1.07 kOe) is found to occur below 47 K due to interfaces of FM and AFM clusters created by antisite-disorder.

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“…[15,16] Multiferroicity and magnetism driven ferroelectricity in Y 2 NiMnO 6 was theoretically predicted and experimentally observed. [17,18] Exotic phenomenon like short-range magnetic correlation, giant rotating magnetocloric effect and metamagnetic behavor in (Tb,Nb ) 2 CoMnO 6 [19,20] magnetic ordering and magnetoelectric properties are observed in these compounds. [21] Further, in thin films of La 2 CoMnO 6 strain-induced perpendicular magnetic anisotropy and spontaneous cationic ordering is observed.…”

Section: Introductionmentioning

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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Competing short-range magnetic correlations, metamagnetic behavior and spin-phonon coupling in Nd2CoMnO6 double perovskite

Cited by 35 publications

References 31 publications

Spin–phonon coupling in monoclinic BiCrO3

Spin–phonon coupling in monoclinic BiCrO3

The effect of antisite disorder on magnetic and exchange bias properties of Gd-substituted Y$_2$CoMnO$_6$ double perovskite

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

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