Percolation like transitions in phase separated manganites La0.5Ca0.5Mn1-Al O3-

Shang, Cui; Xia, Zhengcai; Zhai, Xingwu; Liu, D.W.; Wang, Y.Q.

doi:10.1016/j.ceramint.2019.06.087

Cited by 6 publications

(5 citation statements)

References 23 publications

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“…A recent study on κ-(BEDT-TTF) 2 Cu 2 (CN) 3 under pressure indicated that the Mott insulator-to-metal transition has a percolative nature and therefore is not accompanied by simple closing of the correlation gap, but with a spatial coexistence of correlated metallic and insulating regions [101]. A similar percolative nature of the insulator-to-metal transition has also been reported in α-(BEDT-TTF) 2 I 3 [102] and manganites La 0.5 Ca 0.5 Mn 1−x Al x O 3−δ [103]. Here, the recent development of new computational approaches based on machine learning is of utmost importance in unraveling fine details of the metal-insulator transitions in strongly correlated systems [104].…”

Section: Discussionsupporting

confidence: 57%

Charge Transport in the Presence of Correlations and Disorder: Organic Conductors and Manganites

Tafra,

Basletić,

Ivek

et al. 2024

Materials

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One of the most fascinating aspects of condensed matter is its ability to conduct electricity, which is particularly pronounced in conventional metals such as copper or silver. Such behavior stems from a strong tendency of valence electrons to delocalize in a periodic potential created by ions in the crystal lattice of a given material. In many advanced materials, however, this basic delocalization process of the valence electrons competes with various processes that tend to localize these very same valence electrons, thus driving the insulating behavior. The two such most important processes are the Mott localization, driven by strong correlation effects among the valence electrons, and the Anderson localization, driven by the interaction of the valence electrons with a strong disorder potential. These two localization processes are almost exclusively considered separately from both an experimental and a theoretical standpoint. Here, we offer an overview of our long-standing research on selected organic conductors and manganites, that clearly show the presence of both these localization processes. We discuss these results within existing theories of Mott–Anderson localization and argue that such behavior could be a common feature of many advanced materials.

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Section: Discussionsupporting

confidence: 57%

Charge Transport in the Presence of Correlations and Disorder: Organic Conductors and Manganites

Tafra,

Basletić,

Ivek

et al. 2024

Materials

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“…The intensity of the exchange interactions decreases with the oxygen vacancy concentration increase. Exchange near the oxygen vacancies is negative according to Goodenough–Kanamori empirical rules [29,30].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Mn0.5Zn0.5SmxEuxFe1.8−2xO4 Nanoparticles via the Hydrothermal Approach Induced Anti-Cancer and Anti-Bacterial Activities

et al. 2019

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Manganese metallic nanoparticles are attractive materials for various biological and medical applications. In the present study, we synthesized unique Mn0.5Zn0.5SmxEuxFe1.8−2xO4 (0.01 ≤ x ≤ 0.05) nanoparticles (NPs) by using the hydrothermal approach. The structure and surface morphology of the products were determined by X-ray powder diffraction (XRD), transmission electron and scanning electron microcopies (TEM and SEM), along with energy dispersive X-ray spectroscopy (EDX). We evaluated the impact of Mn0.5Zn0.5SmxEuxFe1.8−2xO4 NPs on both human embryonic stem cells (HEK-293) (normal cells) and human colon carcinoma cells (HCT-116) (cancerous cells). We found that post-48 h of treatment of all products showed a significant decline in the cancer cell population as revealed by microscopically and the (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) tetrazolium (MTT) assay. The inhibitory concentration (IC50) values of the products ranged between 0.75 and 2.25 µg/mL. When tested on normal and healthy cells (HEK-293), we found that the treatment of products did not produce any effects on the normal cells, which suggests that all products selectively targeted the cancerous cells. The anti-bacterial properties of the samples were also evaluated by Minimum Inhibitory Concentration (MIC) and Minimum Bactericidal Concentration (MBC) assays, which showed that products also inhibited the bacterial growth.

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“…All the samples exhibit a high transmittance (over ~80 %) at wavelengths longer than 300 nm. The oxygen concentration in the Ga2O3 crystals will affect the charge states, which in turn will influence such electrical parameters as bandgap and, consequently, the transmittance [24,25].The optical bandgap is extracted from the linear part of the graph, shown in Figure 3b, for (αhν) 2 = 0, where hν is the photon energy, and α is the coefficient of absorption. α = ln(100/T)/d, where T and d is the transmittance and thickness (120 nm) of the Ga2O3 films, respectively.…”

Section: Materials Propertiesmentioning

confidence: 99%

Influence of Annealing Atmosphere on the Characteristics of Ga2O3/4H-SiC n-n Heterojunction Diodes

Lee

Schweitz

et al. 2020

Materials

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Ga2O3/4H-SiC n-n isotype heterojunction diodes were fabricated by depositing Ga2O3 thin films by RF magnetron sputtering. The influence of annealing atmosphere on the film quality and electrical properties of Ga2O3 layers was investigated. X-ray diffraction (XRD) analysis showed a significant increase in the peak intensities of different faces of β-Ga2O3 {(−201), (−401) and (002)}. X-ray photoelectron spectroscopy (XPS) measurement showed that the atomic ratio of oxygen increases under high-temperature annealing. Moreover, an N2-annealed diode exhibited a greater rectifying ratio and a lower thermal activation energy owing to the decrease in oxygen-related traps and vacancies on the Ga2O3 film and Ga2O3–metal interface.

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Percolation like transitions in phase separated manganites La0.5Ca0.5Mn1-Al O3-

Cited by 6 publications

References 23 publications

Charge Transport in the Presence of Correlations and Disorder: Organic Conductors and Manganites

Charge Transport in the Presence of Correlations and Disorder: Organic Conductors and Manganites

Synthesis of Mn0.5Zn0.5SmxEuxFe1.8−2xO4 Nanoparticles via the Hydrothermal Approach Induced Anti-Cancer and Anti-Bacterial Activities

Influence of Annealing Atmosphere on the Characteristics of Ga2O3/4H-SiC n-n Heterojunction Diodes

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