Pressure versus Concentration Tuning of the Superconductivity in Ba(Fe1-xCox)2As2

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概要

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• 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 $T_{\text{c}}$ of Ba(Fe1-xCox)2As2 single crystals with different Co content $x$. We find that $T_{\text{c}}( p)$ of underdoped and overdoped samples increases and decreases, respectively, tracking quantitatively the $T_{\text{c}}(x)$ 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.

• 2010-12-15

著者

• Meingast Christoph

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Wolf Thomas

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Drotziger Sandra

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Schweiss Peter

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Grube Kai

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Adelmann Peter

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Löhneysen Hilbert

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Adelmann Peter

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Schweiss Peter

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Grube Kai

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

• Drotziger Sandra

  Karlsruhe Institute of Technology, Institut für Festkörperphysik, P. O. Box 3640, D-76021 Karlsruhe, Germany

関連論文

• Pressure versus Concentration Tuning of the Superconductivity in Ba(Fe1-xCox)2As2
• Decoupling between Field-Instabilities of Antiferromagnetism and Pseudo-Metamagnetism in Rh-Doped CeRu2Si2 Kondo Lattice

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