Avoided quantum criticality and magnetoelastic coupling in BaFe${}_{2-x}$Ni${}_x$As${}_2$

Abstract

We study the structural and magnetic orders in electron-doped BaFe2-xNixAs2 by high-resolution synchrotron X-ray and neutron scatterings. Upon Ni-doping x, the nearly simultaneous tetragonal-to-orthorhombic structural T_s and antiferromagnetic (T_N) phase transitions in BaFe2As2 are gradually suppressed and separated, resulting in T_s>T_N with increasing x as was previously observed. However, the temperature separation between T_s and T_N decreases with increasing x for x> 0.065$,tendingtowardsaquantumbi-criticalpointnearoptimalsuperconductivityatx=\mathrm{0.1.}Thezero-temperaturetransitionispreemptedbytheformationofasecondaryincommensuratemagneticphaseintheregion0.088<x<0.104,resultinginafinitevalueof{T}_N\approx T_c+10$ K above the superconducting dome around $x\approx 0.1$. Our results imply an avoided quantum critical point, which is expected to strongly influence the properties of both the normal and superconducting states.

7 pages; 5 figures

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