Investigation of Transport Properties for FeSe$_{1-x}$Te$_x$ Thin Films under Magnetic Fields

摘要

We investigated the transport properties under magnetic fields of up to 9 Tfor FeSe$_{1-x}$Te$_x$ thin films on CaF$_2$. Measurements of the temperaturedependence of the electrical resistivity revealed that for $x = 0.2 - 0.4$,where $T_{\rm c}$ is the highest, the width of the superconducting transitionincreased with increasing magnetic field, while the width was almost the samewith increasing magnetic field for $x = 0 - 0.1$. In addition, the temperaturedependence of the Hall coefficient drastically changed between $x = 0.1$ and$0.2$ at low temperatures. These results indicate that clear differences in thenature of the superconductivity and electronic structure exist between$x=0-0.1$ and $x \ge 0.2$.