Journal ArticleDOI
Direct measurement of the low-temperature spin-state transition in LaCoO3.
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TLDR
The experimental results are confirmed by first-principles calculations, and it is concluded that the thermally excited spin-state transition occurs from a low to an intermediate spin state, which can be distinguished from the high-spin state.Abstract:
LaCoO3 exhibits an anomaly in its magnetic susceptibility around 80 K associated with a thermally excited transition of the Co 3� -ion spin. We show that electron energy-loss spectroscopy is sensitive to this Co 3� -ion spin-state transition, and that the O K edge prepeak provides a direct measure of the Co 3� spin state in LaCoO3 as a function of temperature. Our experimental results are confirmed by first-principles calculations, and we conclude that the thermally excited spin-state transition occurs from a low to an intermediate spin state, which can be distinguished from the high-spin state.read more
Citations
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Journal ArticleDOI
Engineering electrocatalytic activity in nanosized perovskite cobaltite through surface spin-state transition.
Shiming Zhou,Xianbing Miao,Xu Zhao,Chao Ma,Yuhao Qiu,Zhenpeng Hu,Zhenpeng Hu,Jiyin Zhao,Lei Shi,Jie Zeng +9 more
TL;DR: A facile method is demonstrated to engineer the eg filling of perovskite cobaltite LaCoO3 for improving the oxygen evolution reaction activity, comparable to those of recently reported cobalt oxides with eg∼1.2 configurations.
Journal ArticleDOI
Towards Oxide Electronics: a Roadmap
Mariona Coll,Josep Fontcuberta,Matthias Althammer,Manuel Bibes,Hans Boschker,Albert Calleja,Guanglei Cheng,Guanglei Cheng,Mario Cuoco,Regina Dittmann,Brahim Dkhil,I. El Baggari,Marco Fanciulli,Ignasi Fina,Elvira Fortunato,Carlos Frontera,Sz. Fujita,Vincent Garcia,Sebastian T. B. Goennenwein,Claes-Göran Granqvist,Julie Grollier,Rudolf Gross,Rudolf Gross,A. Hagfeldt,Gervasi Herranz,Kazuhiro Hono,Evert Pieter Houwman,Mark Huijben,Alexei Kalaboukhov,David J. Keeble,Gertjan Koster,Lena F. Kourkoutis,Jeremy Levy,M. Lira-Cantu,Judith L. MacManus-Driscoll,Jochen Mannhart,Rodrigo Martins,Stephan Menzel,Thomas Mikolajick,Mari Napari,Minh D. Nguyen,Gunnar A. Niklasson,Charles Paillard,Shrabani Panigrahi,Guus Rijnders,Florencio Sánchez,Pablo Sanchis,Simone Sanna,Darrell G. Schlom,Uwe Schroeder,Kyle Shen,Anne Siemon,M. Spreitzer,Hiroaki Sukegawa,R. Tamayo,J. van den Brink,Nini Pryds,F. Miletto Granozio +57 more
TL;DR: The Towards Oxide-Based Electronics (TO-BE) Action as mentioned in this paper has been recently running in Europe and has involved as participants several hundred scientists from 29 EU countries in a wide four-year project.
Journal ArticleDOI
Specific features of spin, charge, and orbital ordering in cobaltites
N. B. Ivanova,Sergei G. Ovchinnikov,Sergei G. Ovchinnikov,Maxim M. Korshunov,Ilya Eremin,N. V. Kazak +5 more
TL;DR: In this paper, a review of complex cobalt oxides known as cobaltites is presented, with emphasis on the interplay between charge, spin, and orbital degrees of freedom.
Journal ArticleDOI
Dynamically Stable Active Sites from Surface Evolution of Perovskite Materials during the Oxygen Evolution Reaction.
Pietro P. Lopes,Dong Young Chung,Xue Rui,Hong Zheng,Haiying He,Pedro Farinazzo Bergamo Dias Martins,Dusan Strmcnik,Vojislav R. Stamenkovic,Peter Zapol,John F. Mitchell,Robert F. Klie,Nenad M. Markovic +11 more
TL;DR: In this paper, the authors demonstrate that the origin of the OER activity in a La1-xSrxCoO3 model perovskite arises from a thin surface layer of Co hydr(oxy)oxide (CoOxHy) that interacts with trace-level Fe species present in the electrolyte, creating dynamically stable active sites.
Journal ArticleDOI
First-principles study for low-spin LaCoO 3 with a structurally consistent Hubbard U
TL;DR: In this paper, the authors used the local density approximation + the Hubbard $U$ method to calculate the structural and electronic properties of low spin low-spin LaCoO, and showed that the fully optimized atomic structure agrees with experimental data better than the calculations with fixed or vanishing $U$.
References
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Book
Density-functional theory of atoms and molecules
TL;DR: In this paper, a review of current studies in density functional theory and density matrix functional theory is presented, with special attention to the possible applications within chemistry, including the concept of an atom in a molecule, calculation of electronegativities from the Xα method, pressure, Gibbs-Duhem equation, Maxwell relations and stability conditions.
Book
Electron Energy-Loss Spectroscopy in the Electron Microscope
Ray F. Egerton,Dale E. Newbury +1 more
TL;DR: In this article, the authors present an overview of the basic principles of energy-loss spectroscopy, including the use of the Wien filter, and the analysis of the inner-shell of the detector.
Journal ArticleDOI
Electron energy-loss spectroscopy
TL;DR: For example, electron energy-loss spectroscopy can be used to characterize interfaces buried deep in samples and to identify trace elements in biological specimens as discussed by the authors, and it can even look at an individual row of atoms in a crystal and identify the type of atoms and their bonding states.