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We report on the isotropic pinning obtained in epitaxial Fe(Se,Te) thin filmsgrown on CaF2 (001) substrate. High critical current density values larger than1 MA/cm2 in self field in liquid helium are reached together with a very weakdependence on the magnetic field and a complete isotropy. Analysis throughTransmission Electron Microscopy evidences the presence of defects looking likelattice disorder at a very small scale, between 5 and 20 nm, which are thoughtto be responsible for such isotropic behavior in contrast to what observed onSrTiO3, where defects parallel to the c-axis enhance pinning in that direction

Highly effective and isotropic pinning in epitaxial Fe(Se,Te) thin films grown on CaF2 substrates