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Here we report extensive ultrafast time-resolved reflectivity experiments onoverdoped Bi$_{2}$Sr$_{2}$Ca$_{1-x}$Y$_x$Cu$_{2}$O$_{8+\delta}$ single crystals(T$_C$=78 K) aimed to clarify the nature of the superconducting-to-normal-statephotoinduced phase transition. The experimental data show the lack of thequasiparticles decay time divergence at the fluence required to induce thisphase transition, in contrast to the thermally-driven phase transition observedat T$_C$ and at variance with recently reported photoinducedcharge-density-wave and spin-density-wave to metal phase transitions. Our datademonstrate the non-thermal character of the superconducting-to-normal-statephotoinduced phase transition. The data have been analyzed using an ad-hocdeveloped time-dependent Rothwarf-Taylor model, opening the question on theorder of this non-equilibrium phase transition.

physical review. b, condensed matter and materials physics

Evidence of a photoinduced non-thermal superconducting-to-normal-state  phase transition in overdoped  Bi$_{2}$Sr$_{2}$Ca$_{0.92}$Y$_{0.08}$Cu$_{2}$O$_{8+\delta}$