# Intrinsic pinning by naturally occurring correlated defects in FeSe$_\text{1-x}$Te$_\text{x}$ superconductors

## TL;DR

This study investigates how naturally occurring correlated defects, specifically magnetic phase inclusions, influence vortex pinning and dissipation in FeSe and Fe(Se,Te) superconductors through angular-dependent transport measurements.

## Contribution

It reveals the role of magnetic phase inclusions in forming correlated defect structures that affect vortex pinning in FeSe(1-x)Te(x) superconductors.

## Key findings

- Correlated defects are linked to magnetic phase inclusions.
- Defect orientation is determined by atomic structure matching.
- Defects influence dissipation and vortex behavior.

## Abstract

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.