paper

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 $_{8 + I^´}$

arXiv:1005.4320 · doi:10.1103/PhysRevB.83.064519

Abstract

Here we report extensive ultrafast time-resolved reflectivity experiments on overdoped Bi $_{2}$ Sr $_{2}$ Ca $_{1 - x}$ Y $_{x}$ Cu $_{2}$ O $_{8 + I^´}$ single crystals (T $_{C}$ =78 K) aimed to clarify the nature of the superconducting-to-normal-state photoinduced phase transition. The experimental data show the lack of the quasiparticles decay time divergence at the fluence required to induce this phase transition, in contrast to the thermally-driven phase transition observed at T $_{C}$ and at variance with recently reported photoinduced charge-density-wave and spin-density-wave to metal phase transitions. Our data demonstrate the non-thermal character of the superconducting-to-normal-state photoinduced phase transition. The data have been analyzed using an ad-hoc developed time-dependent Rothwarf-Taylor model, opening the question on the order of this non-equilibrium phase transition.

10 pages, 6 figures

Evidence of a photoinduced non-thermal superconducting-to-normal-state phase transition in overdoped Bi2​Sr2​Ca0.92​Y0.08​Cu2​O8+I^´​

Abstract

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 $_{8 + I^´}$