Three-Body Collective Excitations in the Superconducting Phase of $MgB_2$

Details Three-Body Collective Excitations in the Superconducting Phase of $MgB_2$ Three-Body Collective Excitations in the Superconducting Phase of $MgB_2$

2005-07-12

arxiv.org/abs/cond-mat/0507269v1

J.Phys.:Condens.Matter, v18 pg.1553 (2006)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1088/0953-8984/18/5/007

It is shown that coherent behavior of Cooper's pairs and electrons in the two-band superconductors $MgB_2$ is possible as a result of a strong two-phonon-electron coupling. The spin-$\frac 12$ triples with zero angular momentum are made up of three spin-$\frac 12$ fermions with charge $\emph{e}$. They are gapped Fermi excitations with gap induced by the gaps of the single fermions. Their contribution to the thermodynamics of the $MgB_2$ superconductors is considered.

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