Observation of Magnetic Phase Transition and Magnetocaloric Effect in Ba1−xSrxMnO3−δ

Fang, Yifei; Li, Mingtao; Chen, Fei

doi:10.1007/s10948-018-4648-1

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…The temperature-dependent lattice parameters can be fitted by [30]: Therefore, the role of structural transition/ deformation in the observed phonon anomalies below 262 and 200 K in BSM10 and BMT10, respectively, can be completely ruled out. In order to verify the possible magnetic ordering as reported in similar manganite systems [16,31,32] and its role in the phonon anomalies, magnetization measurements were performed as a function of temperature in both zero field cooling (ZFC) and field cooling (FC) cycles under the applied magnetic field of 500 Oe, as shown in Figure 5 (c, d). The magnetization (M = magnetic moment per unit gram) is found to be weakly temperature (T)-dependent in the high temperature region for both BSM10 and BMT10.…”

Section: Resultsmentioning

confidence: 94%

Spin-phonon coupling in Sr and Ti incorporated 9R-BaMnO3

Poojitha

Rathore

Saha

2019

Journal of Magnetism and Magnetic Materials

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Materials having strong coupling between different degrees of freedom such as spin, lattice, orbital, and charge are of immense interest due to their potential device applications.Here, we have stabilized the 9R phase of BaMnO3, by Sr (Ti) doping in the Ba (Mn) site using solid-state route at ambient pressure, which otherwise requires high-pressure conditions to synthesize. Crystal structure, phonon spectra, and their evolution with temperature are investigated using x-ray diffraction and Raman spectroscopic techniques. Temperaturedependent magnetization data reveal an antiferromagnetic transition at around (TN =) 262 K and 200 K for Ba0.9Sr0.1MnO3 and BaMn0.9Ti0.1O3, respectively. No structural phase transition or lattice instabilities are observed in the measured temperature range (80 -400 K) for both the compounds. We have observed anomalous behaviour of four different phonon modes involving Mn/O-vibrations at low temperatures which have been attributed to spin-phonon coupling.

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Section: Resultsmentioning

confidence: 94%

Spin-phonon coupling in Sr and Ti incorporated 9R-BaMnO3

Poojitha

Rathore

Saha

2019

Journal of Magnetism and Magnetic Materials

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Study of magnetocaloric properties of small Bi-doped Pr0.55Ca0.05Ba0.40Mn1−xBixO3 manganites

Akça,

Kılıç Çetin,

Ekicibil

2024

J Mater Sci: Mater Electron

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Here, we investigated the magnetic and magnetocaloric (MC) properties of manganites labeled PrCaBaMnO and PrCaBaMnBiO, with compositions Pr0.55Ca0.05Ba0.40Mn1−xBixO3 (x = 0 and 0.02), respectively. The solid-state reaction method was used for sample preparation, and the structural properties were checked using X-ray diffraction (XRD). Temperature dependence of magnetization (M(T)) measurements was carried out in the range of 5–300 K under 100 Oe field to determine the transition temperature of the manganites. Magnetic entropy change ($$-\Delta {S}_{\text{M}}$$ - Δ S M ) values were computed from field-dependent magnetization (M(H)) measurements. For the 2 T magnetic field values, the $$-\Delta {{S}_{ }}_{\text{M}}^{\text{max}}$$ - Δ S M max values for the PrCaBaMnO and PrCaBaMnBiO manganites are 3.15 and 2.86 Jkg-1K-1, respectively. Relative Cooling Power (RCP) values were calculated from the temperature dependence of $$-\Delta {S}_{\text{M}}$$ - Δ S M (T) curves, resulting in 82.4 and 88.6 Jkg-1 for PrCaBaMnO and PrCaBaMnBiO, respectively. Banerjee’s criterion and Franco’s universal master curve confirmed that the transition type for the studied manganites is second order.

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