Field-driven transition in the Ba1−xKxFe2As2 superconductor with splayed columnar defects
Akiyoshi Park, Sunseng Pyon, Kengo Ohara, Nozomu Ito, Tsuyoshi Tamegai, Tadashi Kambara, Atsushi Yoshida, Ataru Ichinose
DOI 10.1103/PhysRevB.97.064516 · Physical Review B
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Abstract
Through 2.6 GeV U irradiations, we have induced bimodal splayed columnar defects in Ba1−xKxFe2As2 single crystals with splay angles, ±5∘, ±10∘, ±15∘, and ±20∘. Critical current densities through magnetization measurements were carefully evaluated, where a splay angle of ±5∘ brought about the highest Jc. Magneto-optical images close to Tc indicate highly anisotropic discontinuity lines in the remnant state, and with anisotropy increasing with greater splay angles. Moreover, amongst those with splayed columnar defects, anomalous nonmonotonic field dependences of Jc and S with an extrema at some fraction of the matching field are observed. We discuss that such Jc enhancement arises from a field-driven coupling transition in which intervortex interactions reorganize the vortex structure to be accommodated into columnar defects, thereby increasing pinning at higher fields.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.6 | Pressure not reported | unknown |
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.6 | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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