Abstract
The magnetization M of an Fe(Se, Te) single crystal has been measured as a function of temperature T and dc magnetic field H. The sample properties have been analyzed in the case of a magnetic field parallel to its largest face H||ab. From the M(T) measurement, the Tc of the sample and a magnetic background have been revealed. The superconducting hysteresis loops M(H) were between 2.5 K and 15 K showing a tilt due to the presence of a magnetic signal measured at T > Tc. From the M(H) curves, the critical current density Jc(H) has been extracted at different temperatures showing the presence of a second magnetization peak phenomenon. By extracting and fitting the Jc(T) curves at different fields, a pinning regime crossover has been identified and shown to be responsible for the origin of the second magnetization peak phenomenon. Then, the different kinds of pinning centers of the sample were investigated by means of Dew-Hughes analysis, showing that the pinning mechanism in the sample can be described in the framework of the collective pinning theory. Finally, the values of the pinning force density have been calculated at different temperatures and compared with the literature in order to understand if the sample is promising for high-current and high-power applications.
Highlights
Published: 10 September 2021In 2008, the discovery of the iron-based superconductors (IBSs) [1] was received with great interest by the scientific community primarily because it was largely believed that magnetism and superconductivity could not coexist
We present an analysis of the pinning properties of a single crystal having twin boundaries in the case of a magnetic field applied along its largest face (H||ab)
The superconducting critical temperature Tc of the sample was obtained by performing a M(T) measurement in zero field cooling (ZFC)-field cooling (FC) conditions with an applied field of 0.01 T
Summary
Published: 10 September 2021In 2008, the discovery of the iron-based superconductors (IBSs) [1] was received with great interest by the scientific community primarily because it was largely believed that magnetism and superconductivity could not coexist. Behavior of the grain boundary junctions [8,9,10]. Despite their low Tc values, it has been demonstrated that the IBSs can be suitable for magnet and wire production and/or highpower applications and high-current transport thanks to their high values of critical current density Jc , irreversibility field and upper critical field [11,12,13,14,15,16] as well as their good inter-grain connectivity [8,13,17,18]. The high values of critical current density and upper
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