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The ultrafast manipulation of quantum material has led to many novel andsignificant discoveries. Among them, the light-induced transientsuperconductivity in cuprates achieved by melting competing stripe ordersrepresents a highly appealing accomplishment. However, recent investigationshave shown that the notion of photoinduced superconductivity remains a topic ofcontroversy, and its elucidation solely through c-axis time-resolved terahertzspectroscopy remains an arduous task. Here, we measure the in-plane andout-of-plane transient terahertz responses simultaneously in a stripe-orderednon-superconducting La$_{1.875}$Ba$_{0.125}$CuO$_4$ after near-infraredexcitations. We find that although a pump-induced reflectivity edge appears inthe c-axis reflectance spectrum, the in-plane scattering rate of quasiparticlesis transiently enhanced without any signature of the formation ofsuperconducting condensate within the CuO$_2$ planes. Therefore, we concludethe out-of-plane transient responses cannot be explained by an equivalent ofJosephson tunneling. Our results provide a critical evidence that transientsuperconductivity cannot be induced by melting the competing stripe orders withpump pulses whose photon energy is much higher than the superconducting gap ofcuprates.

Light-induced melting of competing stripe orders without introducing superconductivity in La$_\mathbf{1.875}$Ba$_\mathbf{0.125}$CuO$_\mathbf{4}$