Magnetocaloric effect and spin-phonon correlations in RFe0.5Cr0.5O3 (R = Er and Yb) compounds

Yadav, Kavita; Kaur, Gurpreet; Sharma, Mohit K.; Mukherjee, K.

doi:10.1016/j.physleta.2020.126638

Cited by 16 publications

(4 citation statements)

References 46 publications

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“…Thus, Debye type dielectric relaxation at T 1 and T 2 arises from the charge carrier hopping between the transition metal cations at B site. Such behaviour is not unusual and also observed in other perovskite oxides [13,27,28].…”

Section: Dielectric and Magnetodielectric Effectsupporting

confidence: 70%

“…YbCrO 3 displays magnetization reversal while YbFeO 3 exhibits low temperature spin reorientation [10,11]. Combining both, i.e., in YbFe 0.5 Cr 0.5 O 3 , temperature of spin reorientation rises [12], and MDE coupling is observed [13]. However, to the best of our knowledge, the effect of the presence of Co in rare Earth orthochromites still lacks in literature.…”

Section: Introductionmentioning

confidence: 98%

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Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr_0.5Co_0.5O₃

Kaur

Mukherjee

2023

Phys. Scr.

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Mixed-metal oxides provide a vast playground to enhance and tune the functional properties, as compared to the respective parent oxides. In this context, we report the magnetic, thermal, dielectric, and magnetodielectric properties of NdCr0.5Co0.5O3. Three magnetic transitions, TN1 – antiferromagnetic ordering of Cr3+ cations from paramagnetic state, TN2 – spin reorientation of these Cr3+ cations, and TN3 – due to Nd ordering induced by the Cr sub-lattice; have been observed, due to a reduction in orthorhombic distortion. Modification of magnetic interactions is also noted because of the presence of Co cations in NdCrO3 matrix. The reduction in Nd3+-Cr3+ interactions is further concluded from the Schottky anomaly in the heat capacity, which arises due to Zeeman splitting of the ground state Kramer’s doublet of Nd3+ cations. The presence of significant magnetodielectric coupling (~ 4%) below TN2 has been observed. Additionally, double relaxor-like behaviour around 176 and 230 K, with activation energy ~ 0.24 and 0.32 eV, is observed due to charge carrier hopping at Cr/Co-site. Our studies indicate that structure-driven modifications of Cr3+- Cr3+ and Nd3+-Cr3+ interactions are responsible for enhanced value magnetic transitions and magnetodielectric coupling in NdCr0.5Co0.5O3, as compared to its respective parent compounds.

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Section: Dielectric and Magnetodielectric Effectsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 98%

Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr_0.5Co_0.5O₃

Kaur

Mukherjee

2023

Phys. Scr.

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“…Several reports on RFe 0.5 Cr 0.5 O 3 (R = Ho [52], Dy [53], Er and Yb [54]) explained the presence of strong spin-phonon coupling from temperature dependent Raman spectra, which was evident from the anomalous changes in mode frequencies around magnetic transitions. The deviation of mode frequencies from anharmonic behavior and change in phonon lifetime indicate ordering of magnetic sublattice or SRT for some selective modes associated with specific motions of R and Fe/Cr ions.…”

Section: Raman Spectroscopy Studymentioning

confidence: 99%

Negative magnetization and magnetic ordering of rare earth and transition metal sublattices in NdFe_0.5Cr_0.5O₃

Kanthal,

Banerjee,

Chatterjee

et al. 2024

J. Phys.: Condens. Matter

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We investigate the effect of alloying at the 3d transition metal site of a rare-earth-transition metal oxide, by considering NdFe0.5Cr0.5O3 mixed perovskite with two equal and random distribution of 3d ions, Cr and Fe, interacting with an early 4f rare earth ion, Nd. Employing temperature- and field- dependent magnetization measurements, temperature-dependent x-ray diffraction, neutron powder diffraction, and Raman spectroscopy, we characterize itsstructural and magnetic properties. Our study reveals bipolar magnetic switching (arising from negative magnetization) and magnetocaloric effect which underline the potential of the studied mixed perovskite in device application. The neutron diffraction study shows the absence of spin reorientation transition over the entire temperature range of 1.5-320 K, although both parent compounds exhibit spin orientation transition. We discuss the microscopic origin of this curious behavior. The neutron diffraction results also reveal the ordering of Nd spins at anunusually high temperature of about 40 K, which is corroborated by Raman measurements.

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“…Extensive investigations on the series of compounds based on diverse magnetic phases and interactions reveal intriguing physical properties, such as metamagnetism 25 , 26 , exchange bias 27 , 28 , magnetodielectric effect 22 , 29 , 30 , and multiferroicity 31 – 34 . Additionally, large cryogenic MCEs in polycrystalline forms, such as GdCr 0.5 Fe 0.5 O 3 20 ( = 29.2 J/kg·K for ΔH = 0–4.5 T), Gd 2 NiMnO 6 35 ( = 37.2 J/kg·K for ΔH = 0–8 T), ErCr 0.5 Fe 0.5 O 3 36 ( = 12.4 J/kg·K for ΔH = 0–5 T), and DyCr 0.5 Fe 0.5 O 3 33 ( = 11.3 J/kg·K for ΔH = 0–4.5 T) have also been discovered. Various studies have hypothesized that large magnetic moments of magnetic rare-earth ions with strong anisotropy would significantly affect the cryogenic MCE.…”

Section: Introductionmentioning

confidence: 99%

Giant and highly anisotropic magnetocaloric effects in single crystals of disordered-perovskite RCr0.5Fe0.5O3 (R = Gd, Er)

Shin

Kim

et al. 2023

Sci Rep

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Magnetic anisotropy is crucial in examining suitable materials for magnetic functionalities because it affects their magnetic characteristics. In this study, disordered-perovskite RCr0.5Fe0.5O3 (R = Gd, Er) single crystals were synthesized and the influence of magnetic anisotropy and additional ordering of rare-earth moments on cryogenic magnetocaloric properties was investigated. Both GdCr0.5Fe0.5O3 (GCFO) and ErCr0.5Fe0.5O3 (ECFO) crystallize in an orthorhombic Pbnm structure with randomly distributed Cr3+ and Fe3+ ions. In GCFO, the long-range order of Gd3+ moments emerges at a temperature of TGd (the ordering temperature of Gd3+ moments) = 12 K. The relatively isotropic nature of large Gd3+ moment originating from zero orbital angular momentum exhibits giant and virtually isotropic magnetocaloric effect (MCE), with a maximum magnetic entropy change of $$\Delta {S}_{M}$$ Δ S M ≈ 50.0 J/kg·K. In ECFO, the highly anisotropic magnetizations result in a large rotating MCE characterized by a rotating magnetic entropy change $$\Delta {S}_{\theta }$$ Δ S θ = 20.8 J/kg·K. These results indicate that a detailed understanding of magnetically anisotropic characteristics is the key for exploring improved functional properties in disordered perovskite oxides.

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Magnetocaloric effect and spin-phonon correlations in RFe0.5Cr0.5O3 (R = Er and Yb) compounds

Cited by 16 publications

References 46 publications

Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr_0.5Co_0.5O₃

Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr_0.5Co_0.5O₃

Negative magnetization and magnetic ordering of rare earth and transition metal sublattices in NdFe_0.5Cr_0.5O₃

Giant and highly anisotropic magnetocaloric effects in single crystals of disordered-perovskite RCr0.5Fe0.5O3 (R = Gd, Er)

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Magnetocaloric effect and spin-phonon correlations in RFe0.5Cr0.5O3 (R = Er and Yb) compounds

Cited by 16 publications

References 46 publications

Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr0.5Co0.5O3

Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr0.5Co0.5O3

Negative magnetization and magnetic ordering of rare earth and transition metal sublattices in NdFe0.5Cr0.5O3

Giant and highly anisotropic magnetocaloric effects in single crystals of disordered-perovskite RCr0.5Fe0.5O3 (R = Gd, Er)

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Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr_0.5Co_0.5O₃

Structure driven magnetic properties and magnetodielectric coupling in a mixed metal oxide NdCr_0.5Co_0.5O₃

Negative magnetization and magnetic ordering of rare earth and transition metal sublattices in NdFe_0.5Cr_0.5O₃