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35 papers · 1 filter
Self-avoiding walks on scale-free networks
Carlos P. Herrero
Several kinds of walks on complex networks are currently used to analyze search and navigation in different systems. Many analytical and computational results are known for random…
The one-particle Green's function of one.dimensional insulating materials
M. C. Refolio, J. M. Lopez Sancho, J. Rubio +1
The single particle spectral-weight function (SWF) of the ionic Hubbard model at half filling is calculated in the cluster perturbation theory approximation. An abrupt change of re…
Ising model in scale-free networks: A Monte Carlo simulation
Carlos P. Herrero
The Ising model in uncorrelated scale-free networks has been studied by means of Monte Carlo simulations. These networks are characterized by a degree (or connectivity) distributio…
Short-range charge-order in NiO perovskites (=Pr,Nd,Eu) probed by X-ray absorption spectroscopy
Cínthia Piamonteze, Hélio C. N. Tolentino, Aline Y. Ramos +4
The short-range organization around Ni atoms in orthorhombic NiO (=Pr,Nd,Eu) perovskites has been studied over a wide temperature range by Ni K-edge x-ray absorption sp…
Spin-orbit induced mixed-spin ground state in NiO perovskites probed by XAS: new insight into the metal to insulator transition
C. Piamonteze, F. M. F. de Groot, H. C. N. Tolentino +4
We report on a Ni L edges x-ray absorption spectroscopy (XAS) study in NiO perovskites. These compounds exhibit a metal to insulator () transition as temperature…
Pressure dependence of the upper critical field of MgB2 and of YNi2B2C
H. Suderow, V. G. Tissen, J. P. Brison +5
We present measurements of H under pressure in MgB and in YNiBC. The changes in the shape of H are interpreted within current models and show the ev…