Tuning magnetic and magnetocaloric properties of Pr0.6Sr0.4MnO3 through size modifications

Souza, Anita D.; Vagadia, Megha; Daivajna, Mamatha D.

doi:10.1007/s10854-021-06052-9

Cited by 5 publications

(2 citation statements)

References 67 publications

(104 reference statements)

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“…10,19,35,36 This explains why the CO state is not observed in the case of the manganite nanoparticles. [37][38][39] Thus, the key to the appearance of the high-temperature martensitic CO state in the studied films lies in the crystallite size and the boundary between them. The absence of the CO phase in the 110 nm-thick LSMO film is probably due to its less defective crystal structure.…”

Section: Dalton Transactions Papermentioning

confidence: 99%

Strain-induced charge ordering above room temperature in rare-earth manganites

Samoshkina,

Rautskii,

Neznakhin

et al. 2024

Dalton Trans.

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Section: Dalton Transactions Papermentioning

confidence: 99%

Strain-induced charge ordering above room temperature in rare-earth manganites

Samoshkina,

Rautskii,

Neznakhin

et al. 2024

Dalton Trans.

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“…The solid lines in the insets of figures 13(a) and (b) show the best fit of the variation of linewidth as a function of 2π f γ to equation ( 7) at a particular temperature. While the intercept provides an estimate of ∆H 0 , the slope of the fitted curve gives the value of intrinsic Gilbert damping [28,29,55]. Gilbert damping is typically associated with the SOC that relates the precessing magnetic moment to the lattice [28,29,53].…”

Section: Frequency and Temperature Dependence Of Fmrmentioning

confidence: 99%

Charge-ordering breakdown dynamics and ferromagnetic resonance studies of B-site Cu diluted Pr_1‒xSr _x MnO₃

Bordoloi,

Jena,

Tiwari

et al. 2024

J. Phys.: Condens. Matter

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Here, we report the influence of Jahn-Teller active Cu substitution on the charge-ordering characteristics of one of the well-known manganite Pr0.45Sr0.55MnO3 (S55) which exhibits distorted tetragonal structure (I4/mcm symmetry).Magnetization studies reveal that S55 exhibitsferromagnetic (FM) ordering with Curie temperature, TC ~220.5 K, antiferromagnetic (AFM) ordering below the Néel temperature TN ~ 207.6 K, and charge-ordering (CO) transition TCO~ 210 K which are in-line with the specific heat CP(T) data. Below TN, the CO (Mn3+ ↔ Mn4+) induces long-range AFM order, whereas above TN the FM-ordering driven by the double exchange (DE) interaction leads to a mixed-phase of competing CO-AFM and DE interaction in the region TN < T < TCO, and dominates completely over CO for T > TCO. However, the robust charge-ordering state breakdown altogether with a dilute substitution of Cu at the Mn B-sites resulting in enhanced ferrimagnetic order with TFN ~ 273 K, yet showing large magnetocrystalline anisotropy as confirmed by the ferromagnetic resonance (FMR)studies. Our results reveal that S55 possesses the cationic distribution: (Pr3+Sr2+)A [Mn3+Mn4+]BO3 different from the Cu substituted system: (Pr3+Sr2+)A [Cu2+Mn3+Mn4+]BO3 which is responsible for its diverse magnetic structure metamagnetic transition (HT-Max ~ 8.85 kOe at 180 K) associated with the CO phenomena in S55, first-order nature of the TCO, and the heat capacity (CM = A (T − TN)−α) critical exponent α = 0.097 (0.154) in the region T > TN (T < TN) are consistent with the magnetic structure. The temperature dependence of FMR resonance field ΔHRes(T), peak-to-peak width HPP(T) and Gilbert damping factor αG(T) shows clear anomalies across the TCO and in the morphotropic region (AFM/CO/FM) signifying the important role of admixtured (3+/4+) Mn state. A strong correlation between the FMR αG(T) and switchable magnetic entropy change (∆SMax ~ ‒ 8/+3 J kg−1K−1 for ∆H = 90 kOe) has been established.

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Particle size-dependent structural and magnetic properties of Pr0.6-xBixSr0.4MnO3 (x = 0.10 and 0.25)

Souza,

Sahoo,

Vagadia

et al. 2023

J Mater Sci: Mater Electron

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Nanoparticles of Pr0.6-xBixSr0.4MnO3 (x = 0.10 and 0.25) have been prepared using the swift and cost-effective top-down approach in a high-energy planetary ball mill without any chemical processing and environmental impacts resulting due to pollutants arising from nanoparticle synthesis. The work investigates the role of particle size reduction on the structural and magnetic properties. An increase in milling time from 0 to 240 min results in the drastic reduction of particle size which drops significantly in the initial phase of ball milling i.e., 0–60 min while the microstrain and dislocation densities show nearly monotonic increase. Interestingly the magnetism and size reduction demonstrate a clear one to one correspondence. In both compositions, the paramagnetic (PM) to ferromagnetic (FM) transition, TC decreases and the magnetic transitions broaden both as function Bi and size reduction. The Curie–Weiss analysis of the inverse magnetic susceptibility ($${\chi }^{-1}$$ χ - 1 ) shows a deviation from linearity indicating the presence of the short-range FM interactions above TC which has been understood as Griffith’s phase like singularity. The size reduction can effectively reduce TC, enabling a significant control over tuning of transition temperature and net magnetization. The field dependent magnetization for x = 0.10 demonstrate dominant FM state whereas for x = 0.25, metamagnetic magnetization highlights competitive coexistence of FM and antiferromagnetic (AFM) interactions in the system. With ball milling, the net magnetization decreases, and the metamagnetic behaviour is suppressed. The M–H loops of ball milled nanoparticles are highly unsaturated indicating the enhanced surface disorder in the nanoparticles which can be understood using the core–shell structure.

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Tuning magnetic and magnetocaloric properties of Pr0.6Sr0.4MnO3 through size modifications

Cited by 5 publications

References 67 publications

Strain-induced charge ordering above room temperature in rare-earth manganites

Strain-induced charge ordering above room temperature in rare-earth manganites

Charge-ordering breakdown dynamics and ferromagnetic resonance studies of B-site Cu diluted Pr_1‒xSr _x MnO₃

Particle size-dependent structural and magnetic properties of Pr0.6-xBixSr0.4MnO3 (x = 0.10 and 0.25)

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Tuning magnetic and magnetocaloric properties of Pr0.6Sr0.4MnO3 through size modifications

Cited by 5 publications

References 67 publications

Strain-induced charge ordering above room temperature in rare-earth manganites

Strain-induced charge ordering above room temperature in rare-earth manganites

Charge-ordering breakdown dynamics and ferromagnetic resonance studies of B-site Cu diluted Pr1‒x Sr x MnO3

Particle size-dependent structural and magnetic properties of Pr0.6-xBixSr0.4MnO3 (x = 0.10 and 0.25)

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Charge-ordering breakdown dynamics and ferromagnetic resonance studies of B-site Cu diluted Pr_1‒xSr _x MnO₃