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Chapter
Spin Dependent Thermoelectric Currents of Tunnel Junctions, and Other Nanostructures: Onsager Response-Theory
Spin Currents in Tunnel Junctions, example, those induced by thermoelectric forces due to temperature and magnetization gradients, etc., are discussed in this chapter. Using , in particular for magnetic tun...
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Chapter and Conference Paper
Non-Equilibrium Physics In Solids: Hot-Electron Relaxation
We discuss the time scales for relaxation of excited electrons in transition—metals, ferromagnets like Ni, Co, and semiconductors like diamond, graphite. Ultrafast relaxation faster than ps may occur as a resu...
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Chapter
History of Superconductivity: Conventional, High-Transition Temperature and Novel Superconductors
A brief outline of the history of superconductivity since the discovery by Kamerlingh-Onnes in 1911 is given. The main discoveries and results are discussed including recent ones as High Transition Temperature...
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Chapter
Electronic Theory for Superconductivity in High-T c Cuprates and Sr2RuO4
Electronic Theory for Spin Fluctuation mediated Superconductivity in the Cuprates and Ruthenates: Assuming electron-spin fluctuation coupling as the dominant Cooper pairing mechanism we attempt to explain supe...
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Chapter and Conference Paper
Theory for Key Experiments in Cuprate Superconductors
We argue that a Scalapino-Schrieffer-Wilkins analysis of the elementary excitations is possible in high-Tc cuprates. We demonstrate this by considering the resonance peak in inelastic neutron scattering (INS) exp...
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Chapter
Magnetism of Interacting Two-Dimensional Nanostructures
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Chapter
Recent Developments
In 1911 Kamerling-Onnes discovered superconductivity in mercury at 4.2K, in 1933 the fundamental Meissner-Ochsenfeld effect (j s ∝ A) has been discovered and in 1957 Bardee...
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Chapter
Electronic Theory for Superconductivity in High-T c Cuprates and Sr2RuO4
Superconductivity remains one of the most interesting problems in Solid State Physics. During the last years in particular high-transition temperature superconductivity in the cuprates with non-s-wave pairing sym...
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Chapter
History of Superconductivity: Conventional-, High-Transition Temperature and Novel Superconductors
Since its discovery by H. Kamerling Onnes in Leiden [1] almost one hundred years ago, superconductivity has remained an important area of solid state physics with continuing surprises. Its first observation in...
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Article
Electronic Theory for the Magnetic Anisotropy in Sr2RuO4
Using a three-band Hubbard Hamiltonian we calculated within the random-phase-approximation the spin susceptibility, χ(q, ω), and NMR spin-lattice relaxation rate 1/T 1, in the normal state of the triplet supercon...
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Chapter
Theoretical Analysis of the Symmetry of the Order Parameter in Unconventional Superconductors: Singlet Versus Triplet Pairing
The novel superconductivity with Tc ≈ 1.5K observed recently in layered Sr2RuO4 seems to be a new example of unconventional superconductivity [1]. Its structure is isomorphic to the high-Tc cuprate family La2-x ...
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Chapter and Conference Paper
Non-equilibrium Physics of Magnetic Solids: Time Dependent Changes of Magnetism
The characteristic times for reaching from the initial non-equilibrium state the equilibrium are analyzed for the electrons, the magnetization, magnetic reorientation, magnetic nanostructures and magnetic mome...
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Chapter and Conference Paper
Femtosecond laser-induced ablation of graphite
The dynamics of fs-laser ablation of graphite has been investigated experimentally and theoretically. The experimental observation of two different ablation mechanisms is supported by molecular dynamics calcul...
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Chapter
Calculation of Spin-Fluctuation Energies in Fe N Clusters
A functional-integral theory of itinerant d-electron magnetism is applied to small transition-metal clusters. The spin-fluctuation energies ?Fi(ξ) at different atoms i in FeN (N ≤ 15) are calculated using a real-...
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Chapter
Non-Equilibrium Physics in Solids: Hot-Electron Relaxation
We discuss the time scales for relaxation of excited electrons due to laser irradiation in transition-metals, ferromagnets like Ni, Co, high T c -superconductors, and semico...
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Article
Transport and dynamics of optically excited electrons in metals
Time-resolved two-photon photoemission, based on the equal-pulse correlation technique, is used to measure the energy relaxation and the transport of the photoexcited carriers in thin Ag and Au films. The ener...
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Article
Theory for the ultrafast dynamics of excited clusters: interplay between elementary excitations and atomic structure
We present a theoretical study of the short-time relaxation of clusters in response to ultrafast excitations using femtosecond laser pulses. We analyze the excitation of different types of clusters (Hgn, Agn, Sin
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Article
Theory for laser-induced ultrafast phase transitions in carbon
The response of carbon to femtosecond laser pulses of arbitrary form, different durations, and different intensities is studied theoretically. We perform molecular dynamics simulations based on a microscopic ...
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Article
Theory for underdoped high-Tc superconductors: effects of phase fluctuations
In underdoped cuprates, T c is thought to be determined by Cooper pair phase fluctuations because of the small superfluid density n s . Experimentally, T c is found to scale with n s . The fluctuation-exchange a...
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Article
Charge Stripes in Underdoped Cuprates: Ginzburg-Landau Description
There is experimental evidence that the existence of dynamical charge stripes is a universal property of underdoped cuprates. We use a Ginzburg-Landau approach to study the interplay of the three...
