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Excess Conductivity Analysis of Polycrystalline FeSe Samples with the Addition of Ag

Authors :
Michael Rudolf Koblischka
Yassine Slimani
Anjela Koblischka-Veneva
Thomas Karwoth
XianLin Zeng
Essia Hannachi
Masato Murakami
Source :
Materials, Vol 13, Iss 21, p 5018 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

Bulk FeSe superconductors of the iron-based (IBS) “11” family containing various additions of silver were thoroughly investigated concerning the microstructure using optical microscopy and electron microscopy (TEM and SEM). The measurements of electrical resistivity were performed through the four-point technique in the temperature interval T= 2–150 K. The Aslamazov–Larkin model was employed to analyze the fluctuation-induced conductivity (FIC) in all acquired measurements. In all studied products, we found that the FIC curves consist of five different regimes of fluctuation, viz. critical region (CR), three-dimensional (3D), two-dimensional (2D), one-dimensional (1D), and shortwave fluctuation (SWF) regimes. The critical current density (Jc), the lower and upper critical magnetic fields (Bc1 and Bc2), the coherence length along the c-axis at zero-temperature (ξc(0)), and further parameters were assessed with regards to the silver amount within the products. The analyses discloses a diminution in the resistivity and a great reduction in ξc(0) with Ag addition. The optimal silver doping amount is achieved for 7 wt.%, which yields the best superconducting transition and the greatest Jc value.

Details

Language :
English
ISSN :
19961944
Volume :
13
Issue :
21
Database :
Directory of Open Access Journals
Journal :
Materials
Publication Type :
Academic Journal
Accession number :
edsdoj.484ca1e57b2f46aeae88a287161b8a7d
Document Type :
article
Full Text :
https://doi.org/10.3390/ma13215018