6 papers
Quasicrystal approximants with novel compositions and structures
M. Mihalkovic, M. Widom
We identify several new quasicrystal approximants in alloy systems in which quasicrystals have not been previously reported. Some occur in alloys with large size contrast between t…
Order-disorder transition in the Cd-Ca cubic approximant
M. Widom, M. Mihalkovic
Recent experiments discovered an order-disorder transition occuring at low temperatures in large unit 1/1 cell cubic approximants of the stable Cd-based binary alloy quasicrystals.…
Equilibrium structure of decagonal AlNiCo
S. Naidu, M. Mihalkovic, M. Widom
We investigate the high temperature decagonal quasicrystalline phase of AlNiCo using a quasilattice gas Monte-Carlo simulation. To avoid biasing towards a specifi…
Tile Hamiltonians for Decagonal Phases
M. Widom, I. Al-Lehyani, M. Mihalkovic
A tile Hamiltonian (TH) replaces the actual atomic interactions in a quasicrystal with effective interactions between and within tiles. We study Al-Co-Ni and Al-Co-Cu decagonal qua…
Total-energy-based structure prediction for d(AlNiCo)
Christopher L. Henley, Marek Mihalkovic, Michael Widom
One may predict a quasicrystal structure starting from electrons and quantum mechanics, as approximated by interatomic pair potentials calibrated with ab-initio total-energy calcul…
Structure determinations for random-tiling quasicrystals
C. L. Henley, V. Elser, M. Mihalkovic
How, in principle, could one solve the atomic structure of a quasicrystal, modeled as a random tiling decorated by atoms, and what techniques are available to do it? One path is to…