The order parameter-entropy relation in some universal classes: experimental evidenceThe asymptotic behaviour near phase transitions can be suitably characterized by the scaling of Δs/Q2 with ε=1-T/Tc, where Δs is the excess entropy and Q is the order parameter. As Δs is…J. M. Martin-Olalla, F. J. Romero, S. Ramos et al.·Jan 30, 2003SaveLearn
Modelling transverse dunesTransverse dunes appear in regions of mainly unidirectional wind and high sand availability. A dune model is extended to two dimensional calculation of the shear stress. It is applied to simulate…Veit Schwämmle, Hans J. Herrmann·Jan 30, 2003SaveLearn
Simulation of the Sedimentation of a Falling OblateWe present a numerical investigation of the dynamics of one falling oblate ellipsoid particle in a viscous fluid, in three dimensions, using a constrained-force technique Kai, Kaih and…Frank Fonseca, Hans J. Herrmann·Jan 29, 2003SaveLearn
The influence of the mutual drag of carrier-phonon system on the thermopower and the transverse Nernst-Ettingshausen effectThe thermopower and Nernst-Ettingshausen (NE) effect in degenerate semiconductors and semimetals placed in high electric and magnetic fields are calculated by taking into account the heating of both…M. M. Babaev, T. M. Gassym, M. Tas et al.·Jan 29, 2003SaveLearn
Spin-orbital gapped phase with least symmetry breaking in the one-dimensional symmetrically coupled spin-orbital modelTo describe the spin-orbital energy gap formation in the one-dimensional symmetrically coupled spin-orbital model, we propose a simple mean field theory based on an SU(4) constraint fermion…Guang-Ming Zhang, Hu Hui, Lu Yu·Jan 28, 2003SaveLearn
Three-Fluid Description of the Sympathetic Cooling of a Boson-Fermion MixtureWe present a model for sympathetic cooling of a mixture of fermionic and bosonic atomic gases in harmonic traps, based on a three-fluid description. The model confirms the experimentally observed…M. Wouters, J. Tempere, J. T. Devreese·Jan 28, 2003SaveLearn
Comment on "Self segregation versus clustering in the Evolutionary Minority Game"This is a comment on a paper by S. Hod and E. Nakar, published in Phys. Rev. Lett. 88, 238702 (2002)E. Burgos, Horacio Ceva, R. P. J. Perazzo·Jan 27, 2003SaveLearn
Monte Carlo simulations of ordering in ferromagnetic-antiferromagnetic bilayersMonte Carlo simulations have been used to study phase transitions on coupled anisotropic ferro/antiferromagnetic (FM/AFM) films of classical Heisenberg spins. We consider films of different…Shan-Ho Tsai, D. P. Landau, Thomas C. Schulthess·Jan 27, 2003SaveLearn
Critical dynamics of the simple-cubic Heisenberg antiferromagnet RbMnF3: Extrapolation to q=0Monte Carlo and spin dynamics simulations have been used to study the dynamic critical behavior of RbMnF3, treated as a classical Heisenberg antiferromagnet on a simple cubic lattice. In an…Shan-Ho Tsai, D. P. Landau·Jan 27, 2003SaveLearn
Power law distribution in High School Education: Effect of Economical, Teaching and study conditionsWe studied the statistical distribution of student's performance, which is measured through their marks, in university entrance examination (Vestibular) of UNESP (Universidade Estadual Paulista)…Hari M. Gupta, Jose R. Campanha, Fabio R. Chavarette·Jan 27, 2003SaveLearn
Collective excitations of a trapped boson-fermion mixture across demixingWe calculate the spectrum of low-lying collective excitations in a mesoscopic cloud formed by a Bose-Einstein condensate and a spin-polarized Fermi gas as a function of the boson-fermion repulsions.…P. Capuzzi, A. Minguzzi, M. P. Tosi·Jan 27, 2003SaveLearn
Cooling dynamics of ultracold two-species Fermi-Bose mixturesWe compare strategies for evaporative and sympathetic cooling of two-species Fermi-Bose mixtures in single-color and two-color optical dipole traps. We show that in the latter case a large heat…Carlo Presilla, Roberto Onofrio·Jan 27, 2003SaveLearn
Anomalous acoustic reflection on a sliding interface or a shear bandWe study the reflection of an acoustic plane wave from a steadily sliding planar interface with velocity strengthening friction or a shear band in a confined granular medium. The corresponding…C. Caroli, B. Velicky·Jan 27, 2003SaveLearn
Geographical Embedding of Scale-Free NetworksA method for embedding graphs in Euclidean space is suggested. The method connects nodes to their geographically closest neighbors and economizes on the total physical length of links. The…Daniel ben-Avraham, Alejandro F. Rozenfeld, Reuven Cohen et al.·Jan 26, 2003SaveLearn
Semiconductive and Photoconductive Properties of the Single Molecule Magnets Mn12-Acetate and Fe8Br8Resistivity measurements are reported for single crystals of Mn12-Acetate and Fe8Br8. Both materials exhibit a semiconductor-like, thermally activated behavior over the 200-300 K range.…J. M. North, D. Zipse, N. S. Dalal et al.·Jan 24, 2003SaveLearn
Comment on ``Ramsey Fringes in a Bose-Einstein Condensate between Atoms and Molecules''In Phys. Rev. Lett. 89, 180401 (2002) [cond-mat/0204504], Kokkelmans and Holland interpret the results of a recent experiment at JILA that demonstrated atom-molecule coherence in a Bose-Einstein…Eric Braaten, H. -W. Hammer, M. Kusunoki·Jan 24, 2003SaveLearn
Roton-maxon spectrum and stability of trapped dipolar condensatesWe find that pancake dipolar condensates can exhibit a roton-maxon character of the excitation spectrum, so far only observed in superfluid helium. We also obtain a condition for the dynamical…L. Santos, G. V. Shlyapnikov, M. Lewenstein·Jan 24, 2003SaveLearn
Universal interface width distributions at the depinning thresholdWe compute the probability distribution of the interface width at the depinning threshold, using recent powerful algorithms. It confirms the universality classes found previously. In all cases, the…Alberto Rosso, Werner Krauth, Pierre Le Doussal et al.·Jan 24, 2003SaveLearn
Zeta Function Regularization of Infrared Divergences in Bose-Einstein CondensationThe perturbative calculation of the effect of fluctuations in the nonzero frequency modes of a weakly interacting Bose gas on the condensation temperature is reviewed. These dynamic modes, discarded…Adriaan M. J. Schakel·Jan 24, 2003SaveLearn
Average Lattice Symmetry and Nanoscale Structural Correlations in Magnetoresistive ManganitesWe report x-ray scattering studies of nanoscale structural correlations in the paramagnetic phases of the perovskite manganites La0.75(Ca0.45Sr0.55)0.25MnO3,…V. Kiryukhin, T. Y. Koo, H. Ishibashi et al.·Jan 23, 2003SaveLearn
Pressure Induced Reentrant Electronic and Magnetic State in Pr0.7Ca0.3MnO3 ManganiteIn Pr0.7Ca0.3MnO3, pressure induces reentrant magnetic and electronic state changes in the range 1 atm to 6 GPa. The metal-insulator and magnetic transition temperatures…Congwu Cui, Trevor A. Tyson·Jan 23, 2003SaveLearn
Higher correlations, universal distributions and finite size scaling in the field theory of depinningRecently we constructed a renormalizable field theory up to two loops for the quasi-static depinning of elastic manifolds in a disordered environment. Here we explore further properties of the…Pierre Le Doussal, Kay Joerg Wiese·Jan 23, 2003SaveLearn
High Temperature Ferromagnetism with Giant Magnetic Moment in Transparent Co-doped SnO2-dOccurrence of room temperature ferromagnetism is demonstrated in pulsed laser deposited thin films of Sn1-xCoxO2-d (x<0.3). Interestingly, films of Sn0.95Co0.05O2-d grown on R-plane sapphire not only…S. B. Ogale, R. J. Choudhary, J. P. Buban et al.·Jan 23, 2003SaveLearn
Magnetism in Cobalt doped Cu2O thin films without and with Al, V, Zn codopantsThin films of 5 % Co doped Cu2O were grown on single crystal (001) MgO substrates by pulsed laser deposition, without and with 0.5 % codoping with Al, V or Zn. Structural, electrical, and magnetic…S. N. Kale, S. B. Ogale, S. R. Shinde et al.·Jan 23, 2003SaveLearn
Defect Melting Models for Cubic Lattices and Universal Laws for Melting TemperaturesWe set up simple harmonic lattice models for elastic fluctuations in bcc and fcc lattices and the excitation of dislocations and disclinations. From these we derive, in a lowest approximation,…Hagen Kleinert, Ying Jiang·Jan 23, 2003SaveLearn