Leibniz Institute for Solid State and Materials Research

www.ifw-dresden.de
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.


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Patent
Murata Manufacturing Co., Leibniz Institute for Solid State and Materials Research | Date: 2017-02-23

A roll-up type capacitor that includes a diffusion-preventing layer, a lower electrode layer, a dielectric layer and an upper electrode layer laminated in this order and rolled-up so that the upper electrode layer is present on an inner side, and the diffusion-preventing layer is formed by an atomic layer deposition method.


Patent
Murata Manufacturing Co., Leibniz Institute for Solid State and Materials Research | Date: 2017-02-23

A roll-up type capacitor includes a cylindrical part, a first external electrode, and a second external electrode. The cylindrical part is a rolled-up laminate in which a lower electrode layer, a dielectric layer and an upper electrode layer are laminated in this order. The first external electrode is electrically connected to the upper electrode layer, and the second external electrode is electrically connected to the lower electrode layer, and the first external electrode and the second external electrode are respectively located on opposed sides of the cylindrical part such that they face to each other.


Patent
Murata Manufacturing Co., Leibniz Institute for Solid State and Materials Research | Date: 2017-07-05

The present invention provides a roll-up type capacitor which comprises a diffusion-preventing layer, a lower electrode layer, a dielectric layer and an upper electrode layer wherein a laminate in which the diffusion-preventing layer, the lower electrode layer, the dielectric layer and the upper electrode layer are laminated in this order is rolled-up so that the upper electrode layer is present on the inner side, and the diffusion-preventing layer is formed by an atomic layer deposition method.


Patent
Murata Manufacturing Co., Leibniz Institute for Solid State and Materials Research | Date: 2017-07-05

The present invention provides a roll-up type capacitor which comprises a cylindrical part, a first external electrode, and a second external electrode wherein the cylindrical part is obtained by the self rolling-up of a laminate in which a lower electrode layer, a dielectric layer of perovskite type and an upper electrode layer are stacked in this order; the first external electrode is electrically connected to the upper electrode layer, and the second external electrode is electrically connected to the lower electrode layer; and the first external electrode and the second external electrode are respectively located on each of the both sides of the cylindrical part such that they face to each other. The roll-up type capacitor has a low ESR and can be suitably used in a high frequency range.


Grant
Agency: GTR | Branch: EPSRC | Program: | Phase: Research Grant | Award Amount: 472.52K | Year: 2013

The ability to generate strong and stable magnetic fields is a critical enabling technology for a broad range of sustainable engineering applications. Almost invariably, more compact field sources and higher magnetic field densities lead directly to more efficient and cost effective devices. One example of this can be found in the widespread applications of small, high power DC electric motors, which have proliferated since the development of the cheap high energy density family of NdFeB materials in the 1980s. Wire-wound superconducting magnets, on the other hand, may offer the potential to generate large magnetic fields, but they are extremely expensive and are difficult to manufacture. A cheaper, simpler and more robust option is the use of magnetised bulk superconductors. The (RE)BCO (where RE = rare earth element such as Y, Nd, Sm, Gd, etc.) family of bulk, melt processed high temperature superconductors (HTS), in particular, is the subject of extensive world-wide developmental research. Bulk HTS materials offer considerable potential to both improve the performance of existing devices that incorporate permanent magnets and to develop new, high field and sustainable energy storage applications, in particular. Indeed, these materials represent a direct link between the physical sciences and the development of sustainable applications in the energy needs sector that will be fundamental to growth of the UK economy in the short to medium term. A number of important scientific and technical challenges to the incorporation of (RE)BCO bulk superconducting materials into practical engineering applications remain. These include improving process efficiency, sample properties, yield, reducing the cost of raw materials, recycling, processing larger samples with conformal geometries, development of a practical magnetisation process and the development of bespoke cryogenic systems for specific applications. The main objective of this proposal is to address and overcome the critical aspects of these challenges to gain a fundamental understanding of the single grain growth process. This will enable the cost-effective processing of (RE)BCO materials with conformal geometries that will be fundamental to their application in a range of sustainable engineering devices within the energy sector and healthcare industry. Specific emphasis of the project will be placed on the development of an effective recycling process to enable a new secondary bulk sample source for low to medium field applications, the development of a novel multi-seeding technique for fabricating large samples of conformal geometry and the development of a novel fabrication process based on a graded composition to produce bulk samples with homogeneous superconducting properties throughout the bulk microstructure.


Popov A.A.,Leibniz Institute for Solid State and Materials Research | Yang S.,Hefei University of Technology | Dunsch L.,Leibniz Institute for Solid State and Materials Research
Chemical Reviews | Year: 2013

One of the attractive properties of the hollow carbon clusters, known as fullerenes, is the possibility to use them as robust containers for other species. The field of chemical derivatization of EMFs has flourished in the past decade. Many cyclo- as well as radical addition reactions of EMFs are described forming a basis for the targeted synthesis of EMF-based functional materials. The a plications for EMFs as MRI contrasting agents and as electron-accepting blocks in photovoltaic devices are now considered as the most promising. Importantly, the reactivity and addition patterns of EMFs are significantly different from those of empty fullerenes. Advanced synthetic approaches and the progress in separation techniques dramatically improved the situation with availability of the EMF samples, which resulted in more dedicated and detailed studies of their structural, electronic, physical, and chemical properties. In the 1990s the field of the EMFs remained in the shadow of the empty fullerenes, which often resulted in the blind transfer of the guidelines, structural and chemical properties revealed for the empty fullerenes onto EMFs.


Deng Q.,Leibniz Institute for Solid State and Materials Research | Popov A.A.,Leibniz Institute for Solid State and Materials Research
Journal of the American Chemical Society | Year: 2014

Endohedral clusters in metallofullerenes can vary in a broad range of geometrical parameters following the size and shape of the host carbon cage. Obviously, distortions of the cluster may increase its energy and even destabilize the whole clusterfullerene molecule. However, direct evaluation of the magnitude of cluster strain energies has not been done because of the lack of a suitable computational scheme that would allow one to decouple cluster and fullerene distortions and hence estimate individual components. In this work we offer a simple and efficient scheme to calculate cluster distortion energies in endohedral metallofullerenes (EMFs). Using this scheme, we analyze distortions in three classes of EMFs with nitride, sulfide, and carbide clusters and different metal atoms (Sc, Y, Ti). © 2014 American Chemical 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.


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.


Nishimoto S.,Leibniz Institute for Solid State and Materials Research
Physical Review B - Condensed Matter and Materials Physics | Year: 2011

The von Neumann entanglement entropy is studied with the density-matrix renormalization-group technique. We propose a simple approach to calculate the central charge using the entanglement entropy for a one-dimensional (1D) quantum system. This approach is applied to a couple of quantum systems: (i) a 1D frustrated spin model and (ii) a 1D half-filled spinless fermions with nearest-neighbor repulsion; it is confirmed that the central charge is estimated very accurately for the both systems. Also, a new method to determine the critical point between Tomonaga-Luttinger-liquid and gapped (or ordered) phases from the proposed approach is suggested. Furthermore, we mention that the Tomonaga-Luttinger parameter can be obtained in a like manner as the central charge, using the charge-density fluctuation of a part of the 1D system. © 2011 American Physical Society.

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