Quantifying the electrical transport characteristics of electron-doped La0.7Ce0.3MnO3 thin films through hopping energies, Mn valence, and carrier localization length

Thiessen, A.; Beyreuther, Elke; Werner, R.; Koelle, D.; Kleiner, R.; Eng, Lukas M.

doi:10.1016/j.jpcs.2014.12.014

Cited by 7 publications

(7 citation statements)

References 42 publications

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“…Contrary to that, the amorphous film shows a strong insulating behavior with a fivefold exponential drop of resistivity with a temperature increase from 26 to 70 °C (see Figure 2b). This dependence can be fitted with a good accuracy (Pearson correlation coefficient is 0.9998) using an adiabatic polaron hopping model 𝜎𝑇 ∝ exp (−𝐸 /𝑘𝑇) [18]. The corresponding linear fit shown in Figure 2c gives a hopping activation energy 𝐸 ≈ 350 meV.…”

Section: Resultsmentioning

confidence: 85%

Large Negative Photoresistivity in Amorphous NdNiO3 Film

et al. 2021

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A significant decrease in resistivity by 55% under blue lighting with ~0.4 J·mm−2 energy density is demonstrated in amorphous film of metal-insulator NdNiO3 at room temperature. This large negative photoresistivity contrasts with a small positive photoresistivity of 8% in epitaxial NdNiO3 film under the same illumination conditions. The magnitude of the photoresistivity rises with the increasing power density or decreasing wavelength of light. By combining the analysis of the observed photoresistive effect with optical absorption and the resistivity of the films as a function of temperature, it is shown that photo-stimulated heating determines the photoresistivity in both types of films. Because amorphous films can be easily grown on a wide range of substrates, the demonstrated large photo(thermo)resistivity in such films is attractive for potential applications, e.g., thermal photodetectors and thermistors.

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Section: Resultsmentioning

confidence: 85%

Large Negative Photoresistivity in Amorphous NdNiO3 Film

et al. 2021

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“…There are numerous literature articles on perovskite thin‐films deposited by PLD from single, stoichiometrically composed targets. A few examples include: The manganites La 0.67 Ba 0.33 MnO 3 , La 0.67 Ca 0.33 MnO 3 , and La 0.7 Ce 0.3 MnO 3 ; the nickelate NdNiO 3 ; the titanates SrTiO 3 and Ba 0.25 Sr 0.75 TiO 3 ; the cobaltate LaCoO 3 ; and the chromate BiCrO 3 . Also, films of the double perovskites Sr 2 FeMoO 6 and La 2 NiMnO 6 were deposited by PLD from single targets.…”

Section: Preparation Methods For Perovskitesmentioning

confidence: 99%

“…90 K occurs for δ ≈ 0.26, which was accomplished by a two‐step annealing with first filling‐up the lattice sites (at 830 °C, p (O 2 ) = 100 h Pa), followed by adjusting the interstitial oxygen δ (500 °C, p (O 2 ) = 10 −2 h Pa) . In case of manganites such as La 0.7 Ce 0.3 MnO 3 films, there is evidence that as‐grown specimens do not show oxygen deficiency but, instead, an oxygen excess, which results in an effective hole doping . To remove this excess and to reduce the oxygen concentration further, high‐temperature annealing in ultrahigh vacuum (e.g., 10 −9 hPa at 700 °C) can be employed for several hours.…”

Section: Preparation Methods For Perovskitesmentioning

confidence: 99%

“…To remove this excess and to reduce the oxygen concentration further, high‐temperature annealing in ultrahigh vacuum (e.g., 10 −9 hPa at 700 °C) can be employed for several hours. As a result, the conductivity can be varied by orders of magnitude, the insulator‐to‐metal transition upon cooling can be suppressed, and new features arise including photoconductivity and electro‐resistive effects .…”

Section: Preparation Methods For Perovskitesmentioning

confidence: 99%

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From colossal magnetoresistance to solar cells: An overview on 66 years of research into perovskites

Wagner

Wackers

Cardinaletti

et al. 2017

Phys. Status Solidi A

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Perovskites are a huge family of compounds to which the natural titanium mineral CaTiO 3 is the common ancestor. The cubic structure looks apparently simple, but the variety of metal ions and mixtures thereof that fit into a perovskite lattice is tremendous. Even in the case that the ionic radii do not allow for a perfect cubic ordering, there are various superstructures and orbital-ordering effects to cope elegantly with distortions. The compositional and structural flexibility offers a large toolbox to design and synthesize perovskites with tailored properties searched for by physicists, chemists, materials scientists and device engineers. These materials are equally of interest for fundamental studies and for applied research while both viewpoints cross-fertilize each other regularly. Our overview starts with the discovery of ferromagnetism in manganites in 1950 and ranges until 2016: Today, halide perovskites are fully in focus for their potential in photovoltaic applications. This is certainly not an endpoint, but another milestone in a long series of often-unexpected discoveries on an 'evergreen material'.Ball-and-stick model of the ideal cubic perovskite structure. The cation at the central position or 'B site' (small black dot) defines the group name (e.g., titanates) and plays a key role for the physical properties of the material.

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“….0.8 nm (as estimated in ref. [21]). Between 130 K and 110 K the MR can be fitted by a linear combination of B 2 and B [ fig.…”

Section: 22mentioning

confidence: 99%

Conductivity and magnetoresistance of La_0.7Ce_0.3MnO_3−δthin films under photoexcitation

Thiessen

Beyreuther

Werner

et al. 2014

J. Phys.: Condens. Matter

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Abstract. La 0.7 Ce 0.3 MnO 3 thin films of different thicknesses, degrees of CeO 2 -phase segregation and oxygen deficiency, grown on SrTiO 3 single crystal substrates, were comparatively investigated with respect to both their spectral and temperaturedependent photoconductivity (PC) and their magnetoresistance (MR) behaviour under photoexcitation. While as-grown films were insensitive to optical excitation, oxygen reduction appeared to be an effective way to decrease the film resistance, but the film thickness was found to play a minor role. However, from the evaluation of the spectral behaviour of the PC and the comparison of the MR of the LCeMO/substrate-samples with a bare substrate under illumination we find that the photoconductivity data reflects not only contributions from (i) photogenerated charge carriers in the film and (ii) carriers injected from the photoconductive substrate (as concluded from earlier works), but also (iii) a decisive parallel photoconduction in the SrTiO 3 substrate. Furthermore -also by analyzing the MR characteristics -the unexpected occurence of a strong electroresistive effect in the sample with the highest degree of CeO 2 segregation and oxygen deficiency could be attributed to the electroresistance of the SrTiO 3 substrate as well. The results suggest a critical reconsideration and possibly a reinterpretation of several previous photoconductivity and electroresistance investigations of manganite thin films on SrTiO 3 .

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Quantifying the electrical transport characteristics of electron-doped La0.7Ce0.3MnO3 thin films through hopping energies, Mn valence, and carrier localization length

Cited by 7 publications

References 42 publications

Large Negative Photoresistivity in Amorphous NdNiO3 Film

Large Negative Photoresistivity in Amorphous NdNiO3 Film

From colossal magnetoresistance to solar cells: An overview on 66 years of research into perovskites

Conductivity and magnetoresistance of La_0.7Ce_0.3MnO_3−δthin films under photoexcitation

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Quantifying the electrical transport characteristics of electron-doped La0.7Ce0.3MnO3 thin films through hopping energies, Mn valence, and carrier localization length

Cited by 7 publications

References 42 publications

Large Negative Photoresistivity in Amorphous NdNiO3 Film

Large Negative Photoresistivity in Amorphous NdNiO3 Film

From colossal magnetoresistance to solar cells: An overview on 66 years of research into perovskites

Conductivity and magnetoresistance of La0.7Ce0.3MnO3−δthin films under photoexcitation

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Conductivity and magnetoresistance of La_0.7Ce_0.3MnO_3−δthin films under photoexcitation