Adriana Apetrei

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The aim of this paper is to introduce a new evolutionary formulation of the graph coloring problem, based on the interplay between orderings and colorings of vertices. The new formulation breaks symmetry in the solution space and provides opportunities for combining evolutionary and other search tehniques. Our formulation is very simple compared to previous(More)
We have studied (Tb1-xLax)2Mo2O7 pyrochlores by neutron diffraction and muSR at ambient and under applied pressure. (Tb,La) substitution expands the lattice and induces a change from a spin-glass-like state (x=0) to a noncollinear ferromagnet (x=0.2). In the ferromagnetic structure, the Tb moments orient close to their local anisotropy axes as for an(More)
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