Polaronic effect in the x-ray absorption spectra of La1−x Ca x MnO3 manganites

Huang, Shao-Chang; Liu, Y. T.; Lee, J. M.; Chen, J. M.; Lee, J. F.; Schoenlein, R. W.; Chuang, Yi‐De; Lin, Jiunn‐Yuan

doi:10.1088/1361-648x/ab05a2

Cited by 4 publications

(1 citation statement)

References 50 publications

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“…Optical and electrical properties of LHPs can be significantly altered by structural phase transitions − and crystal size. − Most LHPs undergo orthorhombic, tetragonal, and cubic phase transitions as the temperature increases. ,,− While the phase transition temperatures are dependent on their crystal size, for example, with reduced particle size, the phase transition might happen at lower temperatures. To investigate the size-dependent phase transition behavior, temperature-dependent steady-state photoluminescence (PL) and charge carrier mobility measurements have been used. − By observing the abrupt peak shifts in the temperature-dependent PL spectra or the abrupt change of charge carrier mobility, the phase transition would be confirmed.…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of Size-Dependent Phase Transition in Methylammonium Lead Bromide Perovskite Microcrystals and Nanocrystals

Zheng

Henry

et al. 2022

ACS Omega

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Methylammonium (MA) lead halide perovskites have been widely studied as active materials for advanced optoelectronics. As crystalline semiconductor materials, their properties are strongly affected by their crystal structure. Depending on their applications, the size of MA lead halide perovskite crystals varies by several orders of magnitude. The particle size can lead to different structural phase transitions and optoelectronic properties. Herein, we investigate the size effect for phase transition of MA lead bromide (MAPbBr 3 ) by comparing the temperature-dependent neutron powder diffraction patterns of microcrystals and nanocrystals. The orthorhombic-to-tetragonal phase transition occurs in MAPbBr 3 microcrystals within the temperature range from 100 to 310 K. However, the phase transition is absent in nanocrystals in this temperature range. In this work, we offer a persuasive and direct evidence of the relationship between the particle size and the phase transition in perovskite crystals.

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Section: Introductionmentioning

confidence: 99%

Direct Observation of Size-Dependent Phase Transition in Methylammonium Lead Bromide Perovskite Microcrystals and Nanocrystals

Zheng

Henry

et al. 2022

ACS Omega

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Spin-orbit entanglement driven by the Jahn-Teller effect

Miñarro,

Villa,

Casals

et al. 2024

Nat Commun

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Spin-orbit entanglement in 4d and 5d transition metal systems can enhance electronic correlations, leading to nontrivial ground states and the emergence of exotic excitations. There is also an interest to investigate spin-orbit entanglement in 3 d compounds, though this is challenging due to their smaller spin-orbit coupling. Here we demonstrate that the Jahn-Teller effect in Mn 3+ reduces the energy gap between high- and low- spin-orbital states that lead to enhanced spin-orbit entanglement. Our results show a rare example of synergistic effects of Jahn-Teller and spin-orbit interactions and provide a way to entangle different degrees of freedom in d -metal oxides, which may allow paths to explore the interplay of orbital, lattice and spins in 3 d correlated systems.

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Non-Ohmic conduction in exfoliated La0.7Ca0.3MnO3 thin films

Park

Shin

Song

et al. 2020

Applied Physics Letters

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We present a strong non-Ohmic transport characteristic of the exfoliated La0.7Ca0.3MnO3 thin film obtained by growing a water-soluble sacrificial layer of Sr3Al2O6 between the SrTiO3 substrate and the La0.7Ca0.3MnO3 film. The non-Ohmic conduction manifests itself as a significant amount of electroresistance over a wide range of temperatures. The resistance shows a plateaulike feature at low temperatures, and the electroresistance reaches ∼50 000% at 10 K for input currents varying from 1024 nA to 125 pA. The structural characterization of the exfoliated film reveals the existence of antiphase boundaries, the tunneling through which appears to cause the non-Ohmic feature. Our results provide an avenue into colossal tunneling electroresistance mediated by crystallographic defects.

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Polaronic effect in the x-ray absorption spectra of La_1−xCa_xMnO₃ manganites

Cited by 4 publications

References 50 publications

Direct Observation of Size-Dependent Phase Transition in Methylammonium Lead Bromide Perovskite Microcrystals and Nanocrystals

Direct Observation of Size-Dependent Phase Transition in Methylammonium Lead Bromide Perovskite Microcrystals and Nanocrystals

Spin-orbit entanglement driven by the Jahn-Teller effect

Non-Ohmic conduction in exfoliated La0.7Ca0.3MnO3 thin films

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