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Violation of Ioffe-Regel condition but saturation of resistivity of the high Tc cuprates
M. Calandra, O. Gunnarsson
We demonstrate that the resistivity data of a number of high Tc cuprates, in particular La(2-x)SrxCuO4, are consistent with resistivity saturation, although the Ioffe-Regel conditi…
Electrical resistivity at large temperatures: Saturation and lack thereof
M. Calandra, O. Gunnarsson
Many transition metal compounds show saturation of the resistivity at high temperatures, T, while the alkali-doped fullerenes and the high-Tc cuprates are usually considered to sho…
Phonon dispersion and lifetimes in MgB2
Abhay Shukla, Matteo Calandra, Matteo d'Astuto +9
We measure phonon dispersion and linewidth in a single crystal of MgB_2 along the Gamma-A, Gamma-M and A-L directions using inelastic X-Ray scattering. We use Density Functional Th…
Metal-insulator transition and charge ordering in the extended Hubbard model at one-quarter filling
M. Calandra, J. Merino, Ross H. McKenzie
We study with exact diagonalization the zero temperature properties of the quarter-filled extended Hubbard model on a square lattice. We find that increasing the ratio of the inter…