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.