Abstract
We present a study on the transport and magnetic properties of superconducting Fe1−ySe single crystals. In the superconducting state, the in-plane electrical resistivity of the crystal is measured for fields up to 16 T and as a function of field direction, in order to understand how the vortex dynamics is affected by the presence of defects. A strong deviation from the slightly anisotropic crystal (electronic anisotropy constant 7 ∼ 1.08) is observed as a steep angular dependence, which is interpreted as a signature of the presence of correlated defects. The influence of the correlated defects on the critical current is studied through the angular dependence of the magnetization, and compared to numerical simulations.
Highlights
A new iron-based superconductor family was found, of which F eSe, the compound focused on here, is a member [1]
In order to study the influence of correlated defects on the dynamics of the vortex lattice we measured the angular dependence of ρ in terms of the orientation of H
We used a constant Lorentz force configuration, i.e. the external field is always at a right angle to the applied current. This avoids spurious angular dependencies of the pinning force related to the nonperpendicularity between current density and magnetic field
Summary
A new iron-based superconductor family was found, of which F eSe, the compound focused on here, is a member [1]. Tetragonal F eSe shows two preferential orientations of the c axis, one parallel and the other at 57◦ from the platelet normal. 3. Results and discussion Figure 1 shows in plane electrical resistivity, ρ, measurements for an F e0.92Se crystal with magnetic field, H, perpendicular to the crystal plane.
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