Doping Dependence of the Second Magnetization Peak, Critical Current Density, and Pinning Mechanism in BaFe2-xNixAs2 Pnictide Superconductors

被引：13

作者：

Sundar, Shyam ^{[1
]}

Salem-Sugui, Said, Jr. ^{[1
]}

Lovell, Edmund ^{[2
]}

Vanstone, Alexander ^{[2
]}

Cohen, Lesley F. ^{[2
]}

Gong, Dongliang ^{[3
]}

Zhang, Rui ^{[4
]}

Lu, Xingye ^{[5
,6
]}

Luo, Huiqian ^{[3
]}

Ghivelder, Luis ^{[1
]}

机构：

[1] Univ Fed Rio de Janeiro, Inst Fis, BR-21941972 Rio De Janeiro, RJ, Brazil

[2] Imperial Coll London, Phys Dept, Blackett Lab, London SW7 2AZ, England

[3] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[4] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

[5] Beijing Normal Univ, Ctr Adv Quantum Studies, Beijing 100875, Peoples R China

[6] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China

来源：

ACS APPLIED ELECTRONIC MATERIALS | 2019年 / 1卷 / 02期

基金：

中国国家自然科学基金;

关键词：

pnictide superconductor; second magnetization peak (SMP); magnetic relaxation; vortex pinning; vortex creep; critical current density; single crystal; IRON-BASED SUPERCONDUCTORS; CREEP ACTIVATION-ENERGY; FLUX-CREEP; CRYSTAL;

D O I：

10.1021/acsaelm.8b00014

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A series of high quality BaFe2-xNixAs2 pnictide superconductors were investigated using magnetic relaxation and isothermal magnetic measurements to study the second magnetization peak (SMP) and critical current behavior in the Ni-doped 122 family. The temperature dependence of the magnetic relaxation rate suggests a pinning crossover, whereas its magnetic field dependence hints at a vortex-lattice structural phase transition. The activation energy (U) estimated using the magnetic relaxation data was analyzed in detail for slightly underdoped, slightly overdoped, and an overdoped sample, using Maley's method and collective creep theory. Our results confirm that the SMP in these samples is due to the collective (elastic) to plastic creep crossover as has been observed for the other members of the 122-family. In addition, we also investigated the doping dependence of the critical current density (J(c)) and the vortex-pinning behavior in these compounds. The observed J(c) is higher than the threshold limit (10(5) A/cm(2)) considered for the technological potential and even greater than 1 MA/cm(2) for the slightly underdoped Ni content, x = 0.092 sample. The pinning characteristics were analyzed in terms of the models developed by Dew-Hughes and Griessen et al., which suggest the dominant role of delta 1-type pinning.

引用

页码：179 / 188

页数：19

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