Critical current density and vortex dynamics in uranium irradiated Co-doped BaFe2As2

Observation of lock-in phenomena in heavy-ion-irradiated single crystal ofBa(Fe0.93Co0.07)2Taen1, Yagyuda2, Nakajima3 et al. 2014Phys. Rev. B6041View full textAdd to dashboardCite

“…We can observe dip structures at low fields when H is almost parallel toň, as we reported in Refs. [33,34]. At θ = 0 • , this structure extends up to H 3 kOe, where 4πM irr reaches the maximum.…”

Effects of heavy-ion irradiations in K-doped BaFe2As2

“…It is known that J c in superconductors can be further enhanced by introducing defects using swift particle irradiations [2]. In our previous studies, remarkable effects have been demonstrated in IBS using heavy-ions [3][4][5][6][7][8] and protons [9] into Co-doped Ba-122 single crystals. In these reports, we irradiated heavy-ions such as 200 MeV Au, 800 MeV Xe, and 2.6 GeV U to create columnar defects, which have excellent geometrical matching with vortices, and are expected to be ideal pinning centers.…”

Effects of Asymmetric Splayed Columnar Defects on the Anomalous Peak Effect in Ba0.6K0.4Fe2As2

“…Furthermore, magneto-optical imaging of a DyBa 2 Cu 3 O 7 single crystal with splayed CDs directly demonstrated the anisotropic enhancement of J c [20]. Such an enhancement of J c by introduction of CDs has also been confirmed in iron-based superconductors (IBSs) [3][4][5][6][7][8][9][10][11][12], and IBSs offer new playgrounds for vortex physics in superconductors [22][23][24][25][26]. Transmission electron microscope (TEM) observations showed that introduced CDs in IBSs tend to be discontinuous compared with those in cuprates [3,7,27].…”

“…Introduction of columnar defects (CDs) to superconductors through swift-particle irradiation enhances their critical current density (J c ) [1][2][3][4][5][6][7][8][9][10][11][12]. Various models for describing the mechanism of the formation of CDs, such as thermal spike model [13], have been discussed.…”