The evolution of the optical spectra of LaMnO3 under light n-and p-type doping and the separation of phases

Loshkareva, N. N.; Sukhorukov, Yu. P.; Mostovshchikova, E. V.; Nomerovannaya, L. V.; Махнев, А. А.; Наумов, С. В.; Ганьшина, Е. А.; Rodin, I. A.; Moskvin, A. S.; Balbashov, A. M.

doi:10.1134/1.1458485

Cited by 28 publications

(18 citation statements)

References 13 publications

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“…e g ðdÞ interband transitions in the system of spin-upward bands. 42 The other peaks are believed to both come from electron transitions in [MnO 6 ] octahedrons.…”

Section: Optical Propertiesmentioning

confidence: 98%

Calcium manganate: A promising candidate as buffer layer for hybrid halide perovskite photovoltaic-thermoelectric systems

Zhao

Wang

et al. 2014

Journal of Applied Physics

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We have systematically studied the feasibility of CaMnO3 thin film, an n-type perovskite, to be utilized as the buffer layer for hybrid halide perovskite photovoltaic-thermoelectric device. Locations of the conduction band and the valence band, spontaneous polarization performance, and optical properties were investigated. Results indicate the energy band of CaMnO3 can match up well with that of CH3NH3PbI3 on separating electron-hole pairs. In addition, the consistent polarization angle helps enlarge the open circuit voltage of the composite system. Besides, CaMnO3 film shows large absorption coefficient and low extinction coefficient under visible irradiation, demonstrating high carrier concentration, which is beneficial to the current density. More importantly, benign thermoelectric properties enable CaMnO3 film to assimilate phonon vibration from CH3NH3PbI3. All the above features lead to a bright future of CaMnO3 film, which can be a promising candidate as a buffer layer for hybrid halide perovskite photovoltaic-thermoelectric systems.

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“…e g ðdÞ interband transitions in the system of spin-upward bands. 42 The other peaks are believed to both come from electron transitions in [MnO 6 ] octahedrons.…”

Section: Optical Propertiesmentioning

confidence: 98%

Calcium manganate: A promising candidate as buffer layer for hybrid halide perovskite photovoltaic-thermoelectric systems

Zhao

Wang

et al. 2014

Journal of Applied Physics

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“…51 Subsequently, the ellipsometry measurements were performed for an untwined crystal of LaMnO 3 by Kovaleva et al in a wide temperature range. 45,46 The authors have presented a detailed quantitative analysis of the pronounced redistribution of the spectral weight near the Néel temperature.…”

Section: A Perovskite Manganites Rmnomentioning

confidence: 99%

Optical spectroscopy of charge transfer transitions in multiferroic manganites, ferrites, and related insulators

Moskvin¹,

Pisarev

2010

Low Temperature Physics

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The results of theoretical and experimental studies of charge transfer (CT) transitions in multiferroic manganites, ferrites, and related insulators are reviewed. Starting with a simple cluster model approach one-center p-d and two-center d-d CT transitions, their polarization properties, the role played by structural parameters, orbital mixing, and spin degree of freedom are all addressed. Optical ellipsometry data in the spectral range of 0.6–5.8eV in perovskite and hexagonal rare-earth manganites RMnO3 and in orthorhombic manganites RMn2O5 are analyzed. Two groups of iron oxides, where Fe3+ ions occupy either only octahedral positions (BiFeO3, orhoferrites RFeO3 et al.) and materials with Fe3+ ions both in octahedral and tetrahedral positions (hematite α-Fe2O3, garnets RFe5O12, lithium ferrite LiFe5O8, Ca2Fe2O5 et al.), are discussed.

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“…First ellipsometric measurements for the single crystalline LaMnO 3 samples were performed by Loshkareva et al 10 at room temperature and for the spectral range 1.0-5.0 eV. Later on the ellipsometric measurements were performed for an untwinned crystal of LaMnO 3 by Kovaleva et al 11,12 in a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

Interplay ofp−dandd−dcharge transfer transitions in rare-earth perovskite manganites

Moskvin¹,

Махнев

Nomerovannaya

et al. 2010

Phys. Rev. B

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We have performed both theoretical and experimental study of optical response of parent perovskite manganites RMnO3 with a main goal to elucidate nature of clearly visible optical features. Starting with a simple cluster model approach we addressed the both one-center (p-d ) and two-center (d-d ) charge transfer (CT) transitions, their polarization properties, the role played by structural parameters, orbital mixing, and spin degree of freedom. Optical complex dielectric function of single crystalline samples of RMnO3 (R=La, Pr, Nd, Sm, Eu) was measured by ellipsometric technique at room temperature in the spectral range from 1.0 to 5.0 eV for two light polarizations: E c and E ⊥ c. The comparative analysis of the spectral behavior of ε1 and ε2 is believed to provide a more reliable assignment of spectral features. We have found an overall agreement between experimental spectra and theoretical predictions based on the theory of one-center p-d CT transitions and intersite d-d CT transitions. Our experimental data and theoretical analysis evidence a dual nature of the dielectric gap in nominally stoichiometric matrix of perovskite manganites RMnO3, it is formed by a superposition of forbidden or weak dipole allowed p-d CT transitions and inter-site d-d CT transitions. In fact, the parent perovskite manganites RMnO3 should rather be sorted neither into the CT insulator nor the Mott-Hubbard insulator in the Zaanen, Sawatzky, Allen scheme.

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The evolution of the optical spectra of LaMnO3 under light n-and p-type doping and the separation of phases

Cited by 28 publications

References 13 publications

Calcium manganate: A promising candidate as buffer layer for hybrid halide perovskite photovoltaic-thermoelectric systems

Calcium manganate: A promising candidate as buffer layer for hybrid halide perovskite photovoltaic-thermoelectric systems

Optical spectroscopy of charge transfer transitions in multiferroic manganites, ferrites, and related insulators

Interplay ofp−dandd−dcharge transfer transitions in rare-earth perovskite manganites

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