Microstructure and Flux Pinning of Reacted-and-Pressed, Polycrystalline Ba0.6K0.4Fe2As2 Powders

The flux pinning properties of reacted-and-pressed Ba0.6K0.4Fe2As2 powder were measured using magnetic hysteresis loops in the temperature range 20 K ≤ T ≤ 35 K. The scaling analysis of the flux pinning forces ( F p = j c × B , with j c denoting the critical current density) following the Dew-Hughes...

Full description

Saved in:
Bibliographic Details
Published in:Materials 2019-07, Vol.12 (13), p.2173
Main Authors: Koblischka, Michael R., Koblischka-Veneva, Anjela, Schmauch, Jörg, Murakami, Masato
Format: Article
Language:English
Subjects:
Condensed Matter
Critical current density
Crystal defects
Densification
Electric power
Electromagnetism
Electron backscatter diffraction
Engineering Sciences
Flux pinning
Grain boundaries
Hysteresis loops
Magnetic fields
Magnetic properties
Physics
Point defects
Potassium
Superconductivity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The flux pinning properties of reacted-and-pressed Ba0.6K0.4Fe2As2 powder were measured using magnetic hysteresis loops in the temperature range 20 K ≤ T ≤ 35 K. The scaling analysis of the flux pinning forces ( F p = j c × B , with j c denoting the critical current density) following the Dew-Hughes model reveals a dominant flux pinning provided by normal-conducting point defects ( δ l -pinning) with only small irreversibility fields, H irr , ranging between 0.5 T (35 K) and 16 T (20 K). Kramer plots demonstrate a linear behavior above an applied field of 0.6 T. The samples were further characterized by electron backscatter diffraction (EBSD) analysis to elucidate the origin of the flux pinning. We compare our data with results of Weiss et al. (bulks) and Yao et al. (tapes), revealing that the dominant flux pinning in the samples for applications is provided mainly by grain boundary pinning, created by the densification procedures and the mechanical deformation applied.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12132173