2007 Volume 76 Issue 6 Pages 064714
The electronic and structural properties of Y2C3 are studied from first principles. We optimize all the structural parameters, the lattice constant and internal atomic positions, assuming the observed crystal structure symmetry. We also examine the lattice-constant and the C dimer bond length dependences of the electronic properties of Y2C3. It is found that there is a peak structure in close vicinity to the Fermi energy in the density of states for the optimized structure at all the lattice constants studied. This peak structure comes from a flat band along ΓN line.
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