تقرير
Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$
| العنوان: | Effects of asymmetric splayed columnar defects on the anomalous peak effect in Ba$_{0.6}$K$_{0.4}$Fe$_{2}$As$_{2}$ |
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| المؤلفون: | Takahashi, Ayumu, Pyon, Sunseng, Kambara, Tadashi, Yoshida, Atsushi, Tamegai, Tsuyoshi |
| المصدر: | Journal of the Physical Society of Japan 89, 094705 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | 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. Comment: 19 pages, 7 figures, to be published in Journal of the Physical Society of Japan |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.7566/JPSJ.89.094705 |
| URL الوصول: | http://arxiv.org/abs/2007.13536 |
| رقم الأكسشن: | edsarx.2007.13536 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.7566/JPSJ.89.094705 |
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