Intrinsic pinning by naturally occurring correlated defects in FeSe$_text{1-x}$Te$_text{x}$ superconductors

We study the angular dependence of the dissipation in the superconducting state of FeSe and Fe(Se$_text{1-x}$Te$_text{x}$) through electrical transport measurements, using crystalline intergrown materials. We reveal the key role of the inclusions of the non superconducting magnetic phase Fe$_text{1-y}$(Se$_text{1-x}$Te$_text{x}$), growing into the Fe(Se$_text{1-x}$Te$_text{x}$) pure $beta$-phase, in the development of a correlated defect structure. The matching of both atomic structures defines the growth habit of the crystalline material as well as the correlated planar defects orientation.