2001/03/31 by G. Baskaran
Materials Science · Physics and Astronomy · #Iron-based superconductors research #Physics of Superconductivity and Magnetism #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.65.212505
published as Physical Review, B65, 212505 (2002) · 4 pages, 2 figure, RevTex. Based on a talk given at the Institute Seminar Week, IMSc, Madras (12-16, Feb. 2001)
arxiv created 2001/05/20 · openalex publication_date 2002/05/28 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We view MgB2 as electronically equivalent to (nonstaggered) graphite (B^\ensuremath- layer) that has undergone a zero-gap-semiconductor-to-superconductor phase transition by large c-axis (chemical) pressure due to Mg++ layers. Further, like the p\ensuremathπ-bonded planar organic molecules, graphite is a resonating-valence-bond (RVB) system. The RVB's are the ``preexisting Cooper pairs'' in the ``parental'' zero-gap semiconducting B^\ensuremath- (graphite) sheets that manifest themselves as a superconducting ground state of the transformed metal. Some consequences are pointed out.