Phase Diagram and Calorimetric Properties of NaFe${}_{1-x}$Co${}_x$As

Abstract

We measured the resistivity and magnetic susceptibility to map out the phase diagram of single crystalline NaFe${}_{1-x}$Co${}_x$As. Replacement of Fe by Co suppresses both the structural and magnetic transition, while enhances the superconducting transition temperature ($T_{\mathrm{c}}$) and superconducting component fraction. Magnetic susceptibility exhibits temperature-linear dependence in the high temperatures up to 500 K for all the superconducting samples, but such behavior suddenly breaks down for the non-superconducting overdoped crystal, suggesting that the superconductivity is closely related to the T-linear dependence of susceptibility. Analysis on the superconducting-state specific heat for the optimally doped crystal provides strong evidence for a two-band s-wave order parameter with gap amplitudes of ${\Delta }_1(0)/k_{\mathrm{B}}{T}_{\mathrm{c}}$= 1.78 and ${\Delta }_2(0)/k_{\mathrm{B}}{T}_{\mathrm{c}}$=3.11, being consistent with the nodeless gap symmetry revealed by angle-resolved photoemission spectroscopy experiment.

7 pages, 7 figures

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Cited by in corpus (7)

• Evolution from unconventional spin density wave to superconductivity and a novel gap-like phase in NaFe1-xCoxAs
• Giant enhancement in critical current density, up to a hundredfold, in superconducting NaFe0.97Co0.03As single crystals under hydrostatic pressure
• A crossover in phase diagram of NaFe${}_{1-x}$Co${}_x$As determined by electronic transport measurements
• Crystal growth and the electronic phase diagram of the 4$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Rh${}_x$As in comparison with 3$d$ doped Na${}_{1-\delta }$Fe${}_{1-x}$Co${}_x$As
• Pressure effects on superconducting properties of single-crystalline Co doped NaFeAs
• Strong similarities between the local electronic structure of insulating iron pnictide and lightly doped cuprate
• Simultaneous Vanishing of the Nematic Electronic State and the Structural Orthorhombicity in NaFe${}_{1-x}$Co${}_x$As Single Crystals