Tuning topological disorder in MgB$_{2}$

Details Tuning topological disorder in MgB$_{2}$ Tuning topological disorder in MgB$_{2}$

2006-02-21

arxiv.org/abs/cond-mat/0602506v1

Phys. Rev. B 74, 100505(R) (2006)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

We carried out Raman measurements on neutron-irradiated and Al-doped MgB$_2$ samples. The irradiation-induced topological disorder causes an unexpected appearance of high frequency spectral structures, similar to those observed in lightly Al-doped samples. Our results show that disorder-induced violations of the selection rules are responsible for the modification of the Raman spectrum in both irradiated and Al-doped samples. Theoretical calculations of the phonon density of states support this hypothesis, and demonstrate that the high frequency structures arise mostly from contributions at ${\bf q}\not=0$ of the E$_{2g}$ phonon mode.

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