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Superconductivity is a macroscopic quantum phenomenon and it is commonlybelieved that the in-plane superconducting transition temperature (Tc) shouldbe isotropic for superconductors with crystal structures of stacking layers(quasi two-dimensional). Here, we report the observation of piezostrain-inducedin-plane anisotropy of Tc in FeSe0.5Te0.5 (FST) thin films grown onferroelectrics. The as-prepared FST shows tetragonal phase with equal in-planelattice parameters and absence of in-plane anisotropy of Tc. Upon applyingelectric fields, piezostrain induces difference of the in-plane latticeparameters (a-b) and in-plane anisotropy of Tc. The in-plane anisotropy of Tccorrelates with a-b and becomes more remarkable for larger values of a-b. Somepossible extrinsic effects were ruled out by experiments and analysis. It issuggested that electronic nematicity with one direction induced by piezostrainand inhomogeneous superconductivity in FST are involved in this unusualphenomenon. This work reveals the exotic behavior of FST and will stimulateexploration of similar behavior in other unconventional superconductors.

Piezostrain-induced in-plane anisotropy of superconducting transition temperature for FeSe0.5Te0.5 thin films