Physics – Condensed Matter – Superconductivity
Scientific paper
2010-11-03
Phys. Rev. B 84, 020509(R) (2011)
Physics
Condensed Matter
Superconductivity
Typo in names corrected. Minor changes to the text
Scientific paper
10.1103/PhysRevB.84.020509
We used angle resolved photoemission spectroscopy and thermoelectric power to study the poorly explored, highly overdoped side of the phase diagram of Ba(Fe1-xCox)2As2 high temperature superconductor. Our data demonstrate that several Lifshitz transitions - topological changes of the Fermi surface - occur for large x. Tc starts to decrease with doping when the cylindrical, central hole pocket changes to ellipsoids centering at the Z point, and goes to zero before these ellipsoids disappear around x = 0.2. Changes in thermoelectric power occur at similar x-values. Beyond this doping level the central pocket changes to electron-like and superconductivity does not exist. Our observations reveal the crucial importance of the underlying Fermiology in this class of materials. A necessary condition for superconductivity is the presence of the central hole pockets rather than perfect nesting between central and corner pockets.
Bud'ko Sergey L.
Canfield Paul. C.
Fernandes Rafael M.
Hodovanets H.
Kaminski Adam
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