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22 papers · 2 filters
Hall-effect evolution across a heavy-fermion quantum critical point
S. Paschen, T. Luhmann, S. Wirth +6
A quantum critical point (QCP) develops in a material at absolute zero when a new form of order smoothly emerges in its ground state. QCPs are of great current interest because of…
Formation of clusters in the ground state of the model on a two leg ladder
A. Fledderjohann, A. Langari, K. -H. Muetter
We investigate the ground state properties of the model on a two leg ladder with anisotropic couplings () along rungs and () along legs. We have impleme…
Dispersion of incoherent spectral features in systems with strong electron-phonon coupling
O. Rösch, O. Gunnarsson
We study (inverse) photoemission from systems with strong coupling of doped carriers to phonons. Using an adiabatic approximation, we develop a method for calculating spectra. This…
Ab-Initio Calculation of the Metal-Insulator Transition in Lithium rings
Beate Paulus, Krzysztof Rosciszewski, Peter Fulde +1
We study how the Mott metal-insulator transition (MIT) is affected when we have to deal with electrons with different angular momentum quantum numbers. For that purpose we apply ab…
Antiferromagnetic, Neutral, and Superconducting Band in La_2CuO_4
Ekkehard Krüger
The symmetry of the Bloch functions in the conduction band of tetragonal and orthorhombic La_2CuO_4 is examined for the existence of symmetry-adapted and optimally localizable (usu…
Effect of hydrostatic pressure on the ambient pressure superconductor CePt_3Si
M. Nicklas, G. Sparn, R. Lackner +2
We studied the evolution of superconductivity (sc) and antiferromagnetism (afm) in the heavy fermion compound CePt_3Si with hydrostatic pressure. We present a pressure-temperature…