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Dresden, Germany

The Leibniz Institute for Solid State and Materials Research in Dresden – in short IFW Dresden – is a non-university research institute and a member of the Gottfried Wilhelm Leibniz Scientific Community. It is concerned with modern materials science and combines explorative research in physics, chemistry and materials science with technological development of new materials and products. Wikipedia.

Dunsch L.,Leibniz Institute for Solid State and Materials Research
Journal of Solid State Electrochemistry | Year: 2011

To consider the past, present and future of in situ spectroelectrochemistry, a review on the recent state of modern spectroelectrochemistry and trends in the development of spectroelectrochemcial techniques is presented for the combined application of different in situ spectroelectrochemcial methods like ESR spectroelectrochemistry, NMR spectroelectrochemistry, Raman spectroelectrochemistry or IR spectroelectrochemistry to electrode systems. Starting with a discussion of the first steps in spectroelectrochemistry in the past, the main part of this review is focused on the advantages of the combined application of spectroelectrochemical techniques in the analysis of electrode reactions. The spectroelectrochemical methods are demonstrated to be successful in electrode reactions both for solid structures like polymers or carbon nanotubes and for molecular structures like fullerenes and oligothiophenes. The final outlook is attributed to future developments in spectroelectrochemistry. © 2011 Springer-Verlag.

Oswald S.,Leibniz Institute for Solid State and Materials Research
Applied Surface Science | Year: 2015

For the investigation of chemical changes in Li- and Na-ion battery electrode systems, X-ray photoelectron spectroscopy (XPS) is a well-accepted method. Charge compensation and referencing of the binding energy (BE) scale is necessary to account for the involved mostly non-conducting species. Motivated by a conflict in energy scale referencing of Li-metal samples discussed earlier by several authors, further clarifying experimental results on several Li containing reference materials are presented and extended by similar experiments for Na. When correlating the peak positions of characteristic chemical species in all the different prepared model sample states, there seems to be a systematic deviation in characteristic binding energies of several eV if lithium is present in its metallic state. Similar results were found for sodium. The observations are furthermore confirmed by the implementation of inert artificial energy reference material, such as implanted argon or deposited gold. The behavior is associated with the high reactivity of metallic lithium and a phenomenological explanation is proposed for the understanding of the observations. Consequences for data interpretation in Li-ion battery research will be discussed for various applications in part (II). © 2015 Elsevier B.V. All rights reserved.

Borisenko S.,Leibniz Institute for Solid State and Materials Research
Nature Materials | Year: 2013

Two teams, led by Xinjiang Zhou and Donglai Feng, respectively were able to study the behavior of the electrons in an almost ideal model setting, and confirm earlier indications of a record-high superconducting temperatures (Tc) of 65 K for an iron-based superconductor. The object of their studies was just a single monolayer of iron selenide (FeSe) deposited on strontium titanate (SrTiO3). The two collaborations studied the electronic structure of FeSe in great detail, and by recording the energy (E) and momentum (k) distributions of the electrons they obtained the electronic band dispersions and their energy gaps as a function of various parameters, in such a way that theoretical concepts can be tested.

Ament L.J.P.,Leiden University | Van Veenendaal M.,Argonne National Laboratory | Van Veenendaal M.,Northern Illinois University | Devereaux T.P.,SLAC | And 2 more authors.
Reviews of Modern Physics | Year: 2011

In the past decade, resonant inelastic x-ray scattering (RIXS) has made remarkable progress as a spectroscopic technique. This is a direct result of the availability of high-brilliance synchrotron x-ray radiation sources and of advanced photon detection instrumentation. The technique's unique capability to probe elementary excitations in complex materials by measuring their energy, momentum, and polarization dependence has brought RIXS to the forefront of experimental photon science. Both the experimental and theoretical RIXS investigations of the past decade are reviewed, focusing on those determining the low-energy charge, spin, orbital, and lattice excitations of solids. The fundamentals of RIXS as an experimental method are presented and then the theoretical state of affairs, its recent developments, and the different (approximate) methods to compute the dynamical RIXS response are reviewed. The last decade's body of experimental RIXS data and its interpretation is surveyed, with an emphasis on RIXS studies of correlated electron systems, especially transition-metal compounds. Finally, the promise that RIXS holds for the near future is discussed, particularly in view of the advent of x-ray laser photon sources. © 2011 American Physical Society.

Eschrig H.,Leibniz Institute for Solid State and Materials Research
Physical Review B - Condensed Matter and Materials Physics | Year: 2010

A logical foundation of equilibrium state density functional theory in a Kohn-Sham-type formulation is presented on the basis of Mermin's treatment of the grand canonical state by exploiting functional Legendre transforms. It is simpler and more satisfactory compared to the usual derivation of the ground-state theory and free of most remaining open points of the latter. The existence of the functional derivative of the corresponding density functional F [n] at all densities of grand canonical equilibrium states is proved even in the spin-density matrix version of the theory. It may, in particular, be relevant with respect to cases of spontaneous symmetry breaking such as noncollinear magnetism and orbital order. © 2010 The American Physical Society.

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