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Single crystals of Ca(Fe1-xRux)2As2 (0<x<0.065) andCa1-yLay(Fe0.973Ru0.027)2As2 (0<y<0.2) have been synthesized and studied withrespect to their structural, electronic and magnetic properties. The partialsubstitution of Fe by Ru induces a decrease of the c-axis constant leading forx<0.023 to a suppression of the coupled magnetic and structural (tetragonal toorthorhombic) transitions. At x_cr=0.023 a first order transition to acollapsed tetragonal (CT) phase is found, which behaves like a Fermi liquid andwhich is stabilized by further increase of x. The absence of superconductivitynear x_cr is consistent with truly hydrostatic pressure experiments on undopedCaFe2As2. Starting in the CT regime at x=0.027 we investigate the additionaleffect of electron doping by partial replacement of Ca by La. Most remarkably,with increasing y the CT phase transition is destabilized and the system istuned back into a tetragonal ground state at y>0.08. This effect is ascribed toa weakening of interlayer As-As bonds by electron doping. Upon further electrondoping filamentary superconductivity with Tc of 41 K at y=0.2 is observed.

Reversible Tuning of the Collapsed Tetragonal Phase Transition in CaFe2As2 by Separate Control of Chemical Pressure and Electron Doping