Effect of short range ferromagnetic interaction on magnetocaloric properties of polycrystalline <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si9.svg"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Eu</mml:mi></mml:mrow><mml:mrow><mml:mn>0.55</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.45</mml:mn></mml:mrow></mml:msub><mml:mtext>Mn</mml:mtext><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi

Mazumdar, Dipak; Das, Kalipada; Das, I.

doi:10.1016/j.jmmm.2020.166507

Cited by 15 publications

(2 citation statements)

References 62 publications

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“…The maximum change in the entropy (−∆S MAX ) of ∼2.2 J kg −1 K −1 occurs across the ordering temperature T FN , while a negligibly small negative entropy change occurring between 4 K and 14.3 K is ascribed to the development of AFM short range correlations [67]. The full width at half maximum (FWHM) of the −∆S M (T) (80.36 K) cusp is unusually large showing the robust relative cooling power (RCP) (δT FWHM × (−∆S MAX ) or RCP = ´T2 T1 ∆S M, H dT) of ∼198.82 J kg −1 [66,68]. Based on all the order parameters extracted from the above discussed magnetization data, we mapped all the transitions with respect to the applied field at various measurement temperatures and established a H-T phase diagram (shown in figure 19).…”

Section: ∆Smentioning

confidence: 99%

Reentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)Co₂O₄ Kagomé lattice

Singha,

Pramanik,

Joshi

et al. 2023

J. Phys.: Condens. Matter

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We report on the reentrant canonical semi spin-glass (SG) characteristics and controllable field-induced transitions in broken Kagomé symmetry of (GeMn)Co2O4. This B-site spinel exhibits complicated magnetic behavior in which the longitudinal ferrimagnetic (FiM) order sets in below the Néel temperature TFN~77 K due to uneven moments of Co2+ (↑ 5.33 μB) and Mn4+ (↓ 3.87 μB) which coexists with transverse SG state below 72.85 K. Such complicated magnetic behavior results from the competing anisotropic superexchange interactions (J AB/k B ~ 4.3 K, J AA/k B ~ −6.2 K and J BB/k B ~ −3.3 K) between the cations, which is extracted following the Néel’s expression for the two-sublattice model. Dynamical susceptibility (χac (f, T)) and thermoremanent magnetization M TRM (t) data analysed by means of the empirical scaling-laws: Vogel-Fulcher law and Power law of critical slowing down, reveal the reentrant SG like character which evolves through several metastable states. The magnitude of Mydosh parameter (Ω~0.002), critical exponent zν=(6.7±0.07), spin relaxation time τ0=(2.33±0.1)×10−18 s, activation energy E a/k B=(69.8±0.95) K and interparticle interaction strength (T 0=71.6 K) provide the experimental evidences for canonical SG state below the spin freezing temperature T F =72.85 K. Isothermal magnetization plots reveal two field-induced transitions across 9.52 kOe (H SF1) and 45.6 kOe (H SF2) associated with the FiM domains and spin-flip transition, respectively. Analysis of the inverse paramagnetic susceptibility χp -1 (χp=χ-χ0) after subtracting the temperature independent diamagnetic term χ0(= −3×10−3emu mol−1Oe−1) results in the effective magnetic moment μeff=7.654 μB/f.u. This agrees well with the theoretically obtained μeff=7.58 μB/f.u. resulting in the cation distribution (Mn0.2 4+↓)A [Co2 2+↑]BO4 in support of the Hund’s ground state spin configuration S=3⁄2 and S=1⁄2 of Mn4+ and Co2+, respectively. The H-T phase diagram established by analysing all the parameters (T F(H), T FN(H), H SF1(T) and H SF2(T)) extracted from various magnetization measurements enables clear differentiation among the different phases of (GeMn)Co2O4.

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Section: ∆Smentioning

confidence: 99%

Reentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)Co₂O₄ Kagomé lattice

Singha,

Pramanik,

Joshi

et al. 2023

J. Phys.: Condens. Matter

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“…The doped perovskite manganite compounds (having the general formula R 1−x B x MnO 3 , R = rare earth trivalent ion and B = alkaline earth bivalent ion) are one of the most well-studied systems netic (FM) doped perovskite manganite compounds possess insulating and metallic ground states respectively below the respected transition temperatures, suggesting the strong correlation between magnetism and electronic properties. However, the scenario becomes quite different in case of the disordered FM or glassy systems having short-range-type of interactions [18][19][20]. Moreover, the distinguished nature of the physical properties can also be observed in presence of the external magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Spin-polarized tunneling and polaronic transport properties of polycrystalline (Sm_1−yGd_y)_0.55Sr_0.45MnO₃ (y = 0.5 and 0.7) compounds

Mazumdar¹,

Das²,

Das³

2021

J. Phys.: Condens. Matter

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The detail investigations on the magneto-transport properties of the polycrystalline (Sm 0.3 Gd 0.7 ) 0.55 Sr 0.45 MnO 3 (SGSMO-1) and (Sm 0.5 Gd 0.5 ) 0.55 Sr 0.45 MnO 3 (SGSMO-2) compounds, having a glassy-like and ferromagnetic ground states respectively have been carried out in details. Due to the existence of two different magnetic ground states in the above mentioned systems, the magneto-transport properties are markedly differed from each other, specially at the low temperature region. The highly semi-conducting nature of the SGSMO-1 compound is suppressed with the application of magnetic field, whereas the SGSMO-2 compound exhibits a metal-insulator transition in its pristine state. The high-temperature semiconducting state of both the systems can be well-explained with the polaronic transport mechanisms via small-polaron hopping and variable-range-hopping models. The low-temperature metallic states for both the systems are explored by considering the various contributions arise from the grain boundary effect, electron-electron, electron-phonon, electron-magnon etc scattering processes. The spin-polarized tunneling transport mechanism at the grain boundaries plays a crucial role in the enhancement of low-field magnetoresistance in the studied systems.

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Spin-glass-like behavior and magnetocaloric properties in LaBiCaMn2O7 layered perovskite

et al. 2021

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Effect of short range ferromagnetic interaction on magnetocaloric properties of polycrystalline Eu0.55Sr0.45MnO

Cited by 15 publications

References 62 publications

Reentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)Co₂O₄ Kagomé lattice

Reentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)Co₂O₄ Kagomé lattice

Spin-polarized tunneling and polaronic transport properties of polycrystalline (Sm_1−yGd_y)_0.55Sr_0.45MnO₃ (y = 0.5 and 0.7) compounds

Spin-glass-like behavior and magnetocaloric properties in LaBiCaMn2O7 layered perovskite

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Effect of short range ferromagnetic interaction on magnetocaloric properties of polycrystalline Eu0.55Sr0.45MnO

Cited by 15 publications

References 62 publications

Reentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)Co2O4 Kagomé lattice

Reentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)Co2O4 Kagomé lattice

Spin-polarized tunneling and polaronic transport properties of polycrystalline (Sm1−y Gd y )0.55Sr0.45MnO3 (y = 0.5 and 0.7) compounds

Spin-glass-like behavior and magnetocaloric properties in LaBiCaMn2O7 layered perovskite

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Reentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)Co₂O₄ Kagomé lattice

Reentrant canonical spin-glass dynamics and tunable field-induced transitions in (GeMn)Co₂O₄ Kagomé lattice

Spin-polarized tunneling and polaronic transport properties of polycrystalline (Sm_1−yGd_y)_0.55Sr_0.45MnO₃ (y = 0.5 and 0.7) compounds