Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa2Fe4As4F2

We report the critical current density (Jc) and vortex pinning properties in single crystals of a novel iron-based superconductor (IBS) KCa2Fe4As4F2 with large <i&...

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Main Authors:	Sunseng Pyon, Soichi Taya, Yuto Kobayashi, Ayumu Takahashi, Wenjie Li, Toshihiro Taen, Teng Wang, Gang Mu, Hisashi Kitamura, Ataru Ichinose, Tsuyoshi Tamegai
Format:	Article
Language:	English
Published:	MDPI AG 2021-09-01
Series:	Materials
Subjects:	iron-based superconductors (IBS) vortex dynamics ion irradiation KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
Online Access:	https://www.mdpi.com/1996-1944/14/18/5283

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spelling	doaj-179025acb972421e9f9d3720d68f02e62021-09-26T00:36:41ZengMDPI AGMaterials1996-19442021-09-01145283528310.3390/ma14185283Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>Sunseng Pyon0Soichi Taya1Yuto Kobayashi2Ayumu Takahashi3Wenjie Li4Toshihiro Taen5Teng Wang6Gang Mu7Hisashi Kitamura8Ataru Ichinose9Tsuyoshi Tamegai10Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanDepartment of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanDepartment of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanDepartment of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanDepartment of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanInstitute for Solid State Physics, The University of Tokyo, Kashiwa 277-8581, JapanState Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, ChinaNational Institute of Radiological Sciences, National Institutes for Quantum and Radiological Science and Technology, Anagawa, Chiba-shi 263-8555, JapanCentral Research Institute of Electric Power Industry, Grid Innovation Research Laboratory, 2-6-1, Nagasaka, Yokosuka-shi 240-0196, JapanCentral Research Institute of Electric Power Industry, Grid Innovation Research Laboratory, 2-6-1, Nagasaka, Yokosuka-shi 240-0196, JapanDepartment of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanWe report the critical current density (<i>J</i><sub>c</sub>) and vortex pinning properties in single crystals of a novel iron-based superconductor (IBS) KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> with large <i>J</i><sub>c</sub> in the pristine state, before and after introduction of artificial defects by swift-particle irradiation. The effects of 2.6 GeV U and 3 MeV proton irradiations in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> single crystals on transition temperature <i>T</i><sub>c</sub> and <i>J</i><sub>c</sub>, including its dose dependence, are systematically studied. <i>J</i><sub>c</sub>~8 MA/cm<sup>2</sup> under a self-field at 2 K in the pristine crystal is strongly enhanced up to 19.4 and 17.5 MA/cm<sup>2</sup> by irradiation of 2.6 GeV U-ions and 3 MeV protons, respectively. Suppression of <i>T</i><sub>c</sub> and dose dependence of <i>J</i><sub>c</sub> in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> is different from that in a representative IBS of (Ba,K)Fe<sub>2</sub>As<sub>2</sub>, which can be explained by considering the presence of embedded defects in pristine KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>. The vortex dynamics in the pristine and proton irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> single crystals are also investigated from the analyses of the field dependence of <i>J</i><sub>c</sub> and the normalized magnetic relaxation rate. In addition to the contribution of embedded defects, weak collective pinning is considered for comprehensive analyses. Vortex dynamics in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> is similar to those in (Ba,K)Fe<sub>2</sub>As<sub>2</sub> to some extent, and different from that in anisotropic Li<sub>0.8</sub>Fe<sub>0.2</sub>OHFeSe. Large anisotropy, due to the presence of insulating blocking layers in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>, which leads to much lower irreversibility field (<i>H</i><sub>irr</sub>) compared with 122-type IBSs, strongly affect the vortex dynamics.https://www.mdpi.com/1996-1944/14/18/5283iron-based superconductors (IBS)vortex dynamicsion irradiationKCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Sunseng Pyon Soichi Taya Yuto Kobayashi Ayumu Takahashi Wenjie Li Toshihiro Taen Teng Wang Gang Mu Hisashi Kitamura Ataru Ichinose Tsuyoshi Tamegai
spellingShingle	Sunseng Pyon Soichi Taya Yuto Kobayashi Ayumu Takahashi Wenjie Li Toshihiro Taen Teng Wang Gang Mu Hisashi Kitamura Ataru Ichinose Tsuyoshi Tamegai Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> Materials iron-based superconductors (IBS) vortex dynamics ion irradiation KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
author_facet	Sunseng Pyon Soichi Taya Yuto Kobayashi Ayumu Takahashi Wenjie Li Toshihiro Taen Teng Wang Gang Mu Hisashi Kitamura Ataru Ichinose Tsuyoshi Tamegai
author_sort	Sunseng Pyon
title	Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
title_short	Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
title_full	Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
title_fullStr	Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
title_full_unstemmed	Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
title_sort	critical current density and vortex dynamics in pristine and irradiated kca<sub>2</sub>fe<sub>4</sub>as<sub>4</sub>f<sub>2</sub>
publisher	MDPI AG
series	Materials
issn	1996-1944
publishDate	2021-09-01
description	We report the critical current density (<i>J</i><sub>c</sub>) and vortex pinning properties in single crystals of a novel iron-based superconductor (IBS) KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> with large <i>J</i><sub>c</sub> in the pristine state, before and after introduction of artificial defects by swift-particle irradiation. The effects of 2.6 GeV U and 3 MeV proton irradiations in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> single crystals on transition temperature <i>T</i><sub>c</sub> and <i>J</i><sub>c</sub>, including its dose dependence, are systematically studied. <i>J</i><sub>c</sub>~8 MA/cm<sup>2</sup> under a self-field at 2 K in the pristine crystal is strongly enhanced up to 19.4 and 17.5 MA/cm<sup>2</sup> by irradiation of 2.6 GeV U-ions and 3 MeV protons, respectively. Suppression of <i>T</i><sub>c</sub> and dose dependence of <i>J</i><sub>c</sub> in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> is different from that in a representative IBS of (Ba,K)Fe<sub>2</sub>As<sub>2</sub>, which can be explained by considering the presence of embedded defects in pristine KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>. The vortex dynamics in the pristine and proton irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> single crystals are also investigated from the analyses of the field dependence of <i>J</i><sub>c</sub> and the normalized magnetic relaxation rate. In addition to the contribution of embedded defects, weak collective pinning is considered for comprehensive analyses. Vortex dynamics in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> is similar to those in (Ba,K)Fe<sub>2</sub>As<sub>2</sub> to some extent, and different from that in anisotropic Li<sub>0.8</sub>Fe<sub>0.2</sub>OHFeSe. Large anisotropy, due to the presence of insulating blocking layers in KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>, which leads to much lower irreversibility field (<i>H</i><sub>irr</sub>) compared with 122-type IBSs, strongly affect the vortex dynamics.
topic	iron-based superconductors (IBS) vortex dynamics ion irradiation KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>
url	https://www.mdpi.com/1996-1944/14/18/5283
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Critical Current Density and Vortex Dynamics in Pristine and Irradiated KCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub>

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