Electronic phase diagram of the iron-based high- Tc superconductor Ba (Fe1-x Cox) 2 As2 under hydrostatic pressure (0≤x≤0.099)

K. Ahilan, F. L. Ning, T. Imai, A. S. Sefat, M. A. McGuire, B. C. Sales, D. Mandrus

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Abstract

We report comprehensive resistivity measurements of single-crystalline samples of the Ba (Fe1-x Cox) 2 As2 high- Tc superconductor under hydrostatic pressure up to 2.75 GPa and over a broad concentration range, 0≤x≤0.099. We show that application of pressure progressively suppresses the spin-density wave (SDW) transition temperature, TSDW, in the underdoped regime (x□0.051). There is no sign of pressure-induced superconductivity in the undoped BaFe2 As2 down to 1.8 K but applied pressure dramatically enhances Tc in the underdoped regime 0.02□x□0.051. The effect of pressure on Tc is very small in the optimally and overdoped regimes 0.082□x□0.099. As a consequence, the dome of the superconducting phase extends to x□0.02 under pressure. We discuss the implications of our findings in the context of a possible quantum phase transition between the SDW and superconducting phases.

Original languageEnglish
Article number214520
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume79
Issue number21
DOIs
StatePublished - Jun 18 2009

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