Physics – Condensed Matter – Superconductivity
Scientific paper
2010-10-19
J. Phys. Soc. Jpn., Vol.79, No.12, p.124705 (2010)
Physics
Condensed Matter
Superconductivity
14 pages, 4 figures, to be published in JPSJ Vol. 79 No. 12. The copyright is held by The Physical Society of Japan
Scientific paper
10.1143/JPSJ.79.124705
In the iron arsenide compound BaFe2As2, superconductivity can be induced either by a variation of its chemical composition, e.g., by replacing Fe with Co, or by a reduction of the unit-cell volume through the application of hydrostatic pressure p. In contrast to chemical substitutions, pressure is expected to introduce no additional disorder into the lattice. We compare the two routes to superconductivity by measuring the p dependence of the superconducting transition temperature Tc of Ba(Fe(1-x)Cox)2As2 single crystals with different Co content x. We find that Tc(p) of underdoped and overdoped samples increases and decreases, respectively, tracking quantitatively the Tc(x) dependence. To clarify to which extent the superconductivity relies on distinct structural features we analyze the crystal structure as a function of x and compare the results with that of BaFe2As2 under pressure.
Adelmann Peter
Drotziger Sandra
Grube Kai
Löhneysen Hilbert v.
Meingast Christoph
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