Determination of the phase diagram of the electron doped superconductor Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$

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dc.creatorChu, Jiun-Haw
dc.creatorAnalytis, James G.
dc.creatorKucharczyk, Chris
dc.creatorFisher, Ian R.
dc.date2008-11-15
dc.date.accessioned2026-07-07T13:10:20Z
dc.date.available2026-07-07T13:10:20Z
dc.descriptionSystematic measurements of the resistivity, heat capacity, susceptibility and Hall coefficient are presented for single crystal samples of the electron-doped superconductor Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$. These data delineate an $x-T$ phase diagram in which the single magnetic/structural phase transition that is observed for undoped BaFe$_2$As$_2$ at 134 K apparently splits into two distinct phase transitions, both of which are rapidly suppressed with increasing Co concentration. Superconductivity emerges for Co concentrations above $x \sim 0.025$, and appears to coexist with the broken symmetry state for an appreciable range of doping, up to $x \sim 0.06$. The optimal superconducting transition temperature appears to coincide with the Co concentration at which the magnetic/structural phase transitions are totally suppressed, at least within the resolution provided by the finite step size between crystals prepared with different doping levels. Superconductivity is observed for a further range of Co concentrations, before being completely suppressed for $x \sim 0.018$ and above. The form of this $x-T$ phase diagram is suggestive of an association between superconductivity and a quantum critical point arising from suppression of the magnetic and/or structural phase transitions.
dc.identifierhttps://arxiv.org/abs/0811.2463
dc.identifierhttp://arxiv.org/abs/0811.2463
dc.identifierPhys. Rev. B 79, 014506 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.014506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/228990
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleDetermination of the phase diagram of the electron doped superconductor Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$
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