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Phase diagram as a function of doping level and pressure in Eu_(1-x)La_xFe₂As₂ system

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arxiv 1201.1706 v1 pith:BOM4263G submitted 2012-01-09 cond-mat.supr-con cond-mat.str-el

Phase diagram as a function of doping level and pressure in Eu_(1-x)La_xFe₂As₂ system

classification cond-mat.supr-con cond-mat.str-el
keywords pressurecoexistsdiagramdopingfunctionlevelorderphase
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We establish the phase diagram of Eu$_{1-x}$La$_x$Fe$_2$As$_2$ system as a function of doping level x and the pressure by measuring the resistivity and magnetic susceptibility. The pressure can suppress the spin density wave (SDW) and structural transition very efficiently, while enhance the antiferromagnetic (AFM) transition temperature T$_N$ of Eu$^{2+}$. The superconductivity coexists with SDW order at the low pressure, while always coexists with the Eu$^{2+}$ AFM order. The results suggests that Eu$^{2+}$ spin dynamics is disentangeld with superconducting (SC) pairing taken place in the two-dimensional \emph{Fe-As} plane, but it can strongly affect superconducting coherence along c-axis.

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