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Single crystals of CaFe$_2$(As$_{1-x}$P$_x$)$_2$ are found to exhibit thetetragonal (T) to collapsed-tetragonal (cT) transition at $T_{\rm cT}\lesssim100$\,K for $x>0.05$. The c-axis shrinks by $\sim9$% below $T_{\rmcT}$, which substantially diminishes the interband nesting between the hole andelectron bands. In sharp contrast to the superconducting T phase of$A$Fe$_2$(As$_{1-x}$P$_x$)$_2$ ($A=$ Ba, Sr), where the anomalous non-Fermiliquid transport properties are observed, the resistivity, Hall coefficient,and magnetoresistance data in the Ca-based system all indicate that thestandard Fermi liquid behaviors are recovered abruptly below $T_{\rm cT}$, andthe superconductivity disappears completely. The intimate link between thesuperconductivity and the non-Fermi liquid transport enlightens the essentialrole of interband-associated fluctuation effects in Fe-pnictides.

Abrupt recovery of Fermi-liquid transport by the c-axis collapse in CaFe2(As1-xPx)2 single crystals