Enhancement of Superconductivity Near a Structural Instability in Ba(Ni$_{\mathrm{1-x}}$Co$_{\mathrm{x}})_{\mathrm{2}}$As$_{\mathrm{2}}$
ORAL
Abstract
We present a comprehensive study of single crystals of Ba(Ni$_{\mathrm{1-x}}$Co$_{\mathrm{x}})_{\mathrm{2}}$As$_{\mathrm{2\thinspace }}$synthesized using a flux method. With cobalt substitution, we track the evolution of the structural triclinic phase of BaNi$_{\mathrm{2}}$As$_{\mathrm{2}}$ and the superconducting ground state with heat capacity and resistivity measurements. We will present our study of the systematic suppression of the low temperature triclinic state with increasing Co concentration as well as a more than threefold enhancement in the superconducting critical temperature, discussing its relation to iron-based superconductors.
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