Now showing items 1-10 of 10

    • Alternative search strategy for minimal energy nanocluster structures: The case of rhodium, palladium, and silver 

      Rogan Castillo, José; García, Griselda; Loyola, Claudia; Orellana, W.; Ramírez, Ricardo; Kiwi Tichauer, Miguel (AMER INST PHYSICS, 2006-12-07)
      An alternative strategy to find the minimal energy structure of nanoclusters is presented and implemented. We use it to determine the structure of metallic clusters. It consists in an unbiased search, with a global minimum ...
    • Atomistic simulation of soldering iron filled carbon nanotubes 

      Munizaga, Vicente; García, Griselda; Bringa, Eduardo; Weissmann, Mariana; Ramírez, Ricardo; Kiwi Tichauer, Miguel (Elsevier, 2014)
      The melting and soldering processes of two iron filled carbon nanotubes is explored by means of classical molecular dynamics, in order to develop an understanding of the underlying mechanisms that govern the dynamics of ...
    • Diversity driven unbiased search of minimum energy cluster configurations 

      Rogan Castillo, José; Ramírez, Max; Muñoz, Víctor; Valdivia Hepp, Juan; García, Griselda; Ramírez, Ricardo; Kiwi Tichauer, Miguel (2009)
      The determination of the spatial distributions that atoms adopt to form condensed matter is a problem of crucial importance, since most physical properties depend on the atomic arrangement. This is especially relevant for ...
    • Electronic phase transitions of cerium metal 

      Kiwi Tichauer, Miguel; Ramírez, Ricardo (1972)
      The model recently proposed by Ramírez and Falicov is generalized by the incorporation of the spin-orbit splitting of the 4f shell. This generalization provides an understanding of the fractional valence and magnetic ...
    • Mechanical properties of iron filled carbon nanotubes: Numerical simulations 

      Munizaga, Vicente; Ramírez, Ricardo; Kiwi Tichauer, Miguel; García, Griselda (American Institute of Physics, 2017)
      The deformation process of Fe encapsulated in a carbon nanotube (CNT) is investigated by means of classical molecular dynamics. The [100], [110], and [111] Fe crystal orientations parallel to the CNT symmetry axis, as well ...
    • More on the electronic phase transitions of Ce1-xLax alloys 

      Ramírez, Ricardo; Kiwi Tichauer, Miguel (1973)
      The models for electronic phase transitions of Ce1-xLax alloys are critically examined. The ideas put forward in the preceding paper are shown to be inconsistent and to lead to unphysical results. Finally, an experimental ...
    • Nanocluster collisions as a way to understand the role of d-shell polarization 

      Kiwi Tichauer, Miguel; Muñoz, Francisco; García, Griselda; Ramírez, Ricardo; Rogan Castillo, José; Valdivia Hepp, Juan (2012)
      Collision processes between single gold and rhodium atoms and gold and rhodium nanoclusters, respectively, are used to study the interplay between the large elastic energies and the much smaller magnetic interactions. The ...
    • Small Pd clusters: A comparison of phenomenological and ab initio approaches 

      Rogan Castillo, José; García, Griselda; Valdivia Hepp, Juan; Orellana, W.; Romero, A. H.; Ramírez, Ricardo; Kiwi Tichauer, Miguel (2005)
      The lowest-energy structures of small Pd clusters (2≤N≤13) are computed by means of available phenomenological many-body potentials and by ab initio methods. The lowest-energy configuration is found by means of a genetic ...
    • Susceptibility of the Mattis model 

      Rössler, Jaime; Kiwi Tichauer, Miguel; Ramírez, Ricardo (1973)
      We have investigated the susceptibility of the Mattis Hamiltonian by means of Green's-function techniques and using a functional-integral formulation. It turns out that it is not possible to obtain an exact solution for ...
    • Temperature induced disorder in β-Zr 

      Gutiérrez Gallardo, Gonzalo; Kiwi Tichauer, Miguel; Ramírez, Ricardo (Sociedad Mexicana de Fisica, 1998)
      The behavior of free surfaces and of grain boundaries of a bcc Zr system, close to the melting temperature, are investigated using molecular dynamics in combination with a tight-binding potential. Our system consists in ...