Raman mode softening in 
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 induced by optical excitation

Mandal, Arup Kumar; Joshi, Aprajita; Saha, Surajit; De, Binoy Krishna; Chowdhury, Sourav; Sathe, Vasant; Deshpande, Uday; Shukla, D. K.; Kaur, Amandeep; Phase, D. M.; Choudhary, R. J.

doi:10.1103/physrevb.106.104104

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…Raman spectroscopy is an external performance of the electron−phonon interactions and the vibrational properties of solid materials; therefore, it is a powerful and accurate tool to investigate the symmetry of lattice vibrations and thereby the structural variations stimulated by temperature, pressure, or other external factors. 48 In this study, room-temperature Raman spectra were measured for the MAPbBr 1 Cl 2 single crystal by using a 473 nm excitation laser. The obtained Raman spectrum, shown in Figure 4,indicates a strong stock shift at ∼320 cm −1 .…”

Section: Resultsmentioning

confidence: 99%

Investigations on the Strong Light-Changed Photoluminescence Performance and the Crystalline Structure of MAPbBr₁Cl₂ Mixed Halide Perovskites

Wu,

Liu,

et al. 2023

J. Phys. Chem. C

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Section: Resultsmentioning

confidence: 99%

Investigations on the Strong Light-Changed Photoluminescence Performance and the Crystalline Structure of MAPbBr₁Cl₂ Mixed Halide Perovskites

Wu,

Liu,

et al. 2023

J. Phys. Chem. C

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“…For further confirmation, Stokes/anti-Stokes measurements were carried out and are discussed in the supplementary information in figure S2 to interpret the localized heating on the Au-decorated TiO 2 . The localized temperature generated for the 532 nm laser is calculated using equation S1 and is found to be higher for the Au-decorated sample than that of the pristine sample [75][76][77]. Nonradiative decay from the plasmonic metal causes such localized heating and enhances the rate of the catalytic reaction [38].…”

Section: Proposed Mechanism (I)mentioning

confidence: 99%

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

et al. 2023

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Noble metal decorated semiconductor photocatalysts have paid noticeable attention owing to their enhanced photocatalytic activity. Herein, we have synthesized pure rutile phase of TiO2 nanorods composed microflowers morphology by hydrothermal method and decorated them with Au to observe plasmon-induced enhanced photocatalytic efficiency. The optical bandgap engineering through Au decorated TiO2 introduced midgap states, that helps in charge compensation during photodegradation study. The surface plasmonic resonance peak of Au is observed along with the defect peak of TiO2, extending the absorption of the solar spectrum from UV to the visible region. The quenching in photoluminescence intensity with increased Au thickness indicates the formation of Schottky junction at the interface of Au and TiO2 that helps in reducing photo-generated charge carrier recombination. The softening of the Eg Raman mode and photothermal effect originated from the non-radiative decay of localized surface plasmon through electron-phonon and phonon-phonon relaxation. The photocatalytic degradation of Rhodamine 6G (R6G) is monitored by exposing the sample to UV and visible light sources under Raman spectroscopy. The Au decoration plays a crucial role in promoting charge separation, Schottky junction creation, photothermal effect, and UV to visible light absorption to enhance photocatalytic activity, which can be explained on the basis of the charge transfer mechanism. Our in-situ photo-degradation study at the interface of noble metal and semiconducting materials will pave the way to improve the understanding of plasmon-enhanced photocatalytic applications.

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Positive Magneto‐Electric Couplings in Epitaxial Multiferroic SrMnO₃ Thin Film

Mandal,

Chowdhury,

Parate

et al. 2024

Adv Funct Materials

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This study demonstrates the magneto‐dielectric (MD) properties of high quality epitaxially strain multiferroic SrMnO3 thin film on conducting Nb doped SrTiO3 substrate. The study observes considerable high positive MD coupling near room temperature and across the anti‐ferromagnetic transition temperature of SrMnO3. The dielectric maxima of the grown film is above room temperature, which confirms the room temperature ferroelectric nature of the grown film. From out‐of‐plan polarization and PUND (Positive Up Negative Down) measurements in the presence of magnetic field, it is confirmed that the polarization value of grown SrMnO3 thin film increases with an increase in magnetic field. In this study, the oxygen off‐stoichiometry concentration is also varied by varying oxygen partial pressure during deposition and is able to create Mn4+, Mn3+, and Mn2+ in the grown films. Despite having mixed Mn states, SrMnO3 thin films remain in the insulating phase. So, the insulating nature of SrMnO3 thin film is robust with respect to oxygen off‐stoichiometry and vacancy/substrate induced strain mediated change in the crystal field. The study has also demonstrated the variation of MD in SrMnO3 thin film by change in oxygen vacancy induced modification in crystal field.

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Raman mode softening in SrMnO3 induced by optical excitation

Cited by 3 publications

References 42 publications

Investigations on the Strong Light-Changed Photoluminescence Performance and the Crystalline Structure of MAPbBr₁Cl₂ Mixed Halide Perovskites

Investigations on the Strong Light-Changed Photoluminescence Performance and the Crystalline Structure of MAPbBr₁Cl₂ Mixed Halide Perovskites

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

Positive Magneto‐Electric Couplings in Epitaxial Multiferroic SrMnO₃ Thin Film

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Raman mode softening in SrMnO3 induced by optical excitation

Cited by 3 publications

References 42 publications

Investigations on the Strong Light-Changed Photoluminescence Performance and the Crystalline Structure of MAPbBr1Cl2 Mixed Halide Perovskites

Investigations on the Strong Light-Changed Photoluminescence Performance and the Crystalline Structure of MAPbBr1Cl2 Mixed Halide Perovskites

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO2 microflowers

Positive Magneto‐Electric Couplings in Epitaxial Multiferroic SrMnO3 Thin Film

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Product

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About

Investigations on the Strong Light-Changed Photoluminescence Performance and the Crystalline Structure of MAPbBr₁Cl₂ Mixed Halide Perovskites

Investigations on the Strong Light-Changed Photoluminescence Performance and the Crystalline Structure of MAPbBr₁Cl₂ Mixed Halide Perovskites

In-situ monitoring of plasmon-induced nanoscale photocatalytic activity from Au-decorated TiO₂ microflowers

Positive Magneto‐Electric Couplings in Epitaxial Multiferroic SrMnO₃ Thin Film