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Common features in high Tc cuprates and diborides
A. Bianconi,S. Agrestini,G. Campi,M. Filippi,N. L. Saini 한국물리학회 2005 Current Applied Physics Vol.5 No.3
The normal state of magnesium diboride, the simplest metallic system showing the macroscopic quantum coherence at hightemperature (highTc superconductivityHTcS) shows some features that are common with the cuprates, shedding light on thepairing mechanism forTc amplication in HTcS: (1) two or more electronic components associated with multiple Fermi surfaceportions; (2) crossing of electronic topological transitions (ETT) where the Fermi surface changes its topology and (3) phononsoftening in extended Kohn anomalies (EKA) over a large wave-vector range..