Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$

Ayumu Takahashi; Sunseng Pyon; Tadashi Kambara; Atsushi Yoshida; Tsuyoshi Tamegai

doi:10.7566/JPSJ.89.094705

paper

Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$

arXiv:2007.13536 · doi:10.7566/JPSJ.89.094705

Abstract

In order to enhance the critical current density ( $J_{c}$ ) of superconductors, introduction of columnar defects (CDs) through swift-particle irradiation is effective. By dispersing the direction of CDs (splayed CDs), not only further enhancement of $J_{c}$ has been confirmed but also an anomalous peak effect (APE) in $J_{c}$ at a certain magnetic field determined by the irradiation dose was observed. It has been proposed that the APE arises from the suppression of kink motion and/or the effects of vortex entanglement in systems with splayed CDs. In this study, we measure $J_{c}$ properties of optimally K-doped Ba-122-type iron-based superconductor Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$ single crystals with splayed CDs that are introduced asymmetrically with respect to the $c$ -axis by irradiating 2.6 GeV U ions. We discuss the significance of the average direction of splayed CDs to the APE. We also discuss the relationship between the APE and the entanglement of vortices.

19 pages, 7 figures, to be published in Journal of the Physical Society of Japan

Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$

Abstract

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Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba0.6​K0.4​Fe2​As2​

Abstract

References in corpus (9)

Cited by in corpus (2)

Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba $_{0.6}$ K $_{0.4}$ Fe $_{2}$ As $_{2}$