RVB Contribution to Superconductivity in $MgB_2$

Details RVB Contribution to Superconductivity in $MgB_2$ RVB Contribution to Superconductivity in $MgB_2$

2001-03-14

arxiv.org/abs/cond-mat/0103308v2

Physical Review, B65, 212505 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figure, RevTex. Based on a talk given at the Institute Seminar Week, IMSc, Madras (12-16, Feb. 2001)

Scientific paper

10.1103/PhysRevB.65.212505

We view $MgB_2$ as electronically equivalent to (non-staggered) graphite ($B^-$ layer) that has undergone a zero gap semiconductor to a superconductor phase transition by a large c-axis (chemical) pressure due to $Mg^{++}$ layers. Further, like the \ppi bonded planar organic molecules, graphite is an old resonating valence bond (RVB) system. The RVB's are the `preexisting cooper pairs' in the `parental' zero gap semiconducting $B^-$ (graphite) sheets that manifests themselves as a superconducting ground state of the transformed metal. Some consequences are pointed out.

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