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Titel: Excess Conductivity Analysis of Polycrystalline FeSe Samples with the Addition of Ag
VerfasserIn: Koblischka, Michael Rudolf
Slimani, Yassine
Koblischka-Veneva, Anjela
Karwoth, Thomas
Zeng, XianLin
Hannachi, Essia
Murakami, Masato
Sprache: Englisch
Titel: Materials
Bandnummer: 13
Heft: 21
Verlag/Plattform: MDPI
Erscheinungsjahr: 2020
Freie Schlagwörter: iron-based superconductors
FeSe
silver addition
microstructure
resistance
fluctuation-induced conductivity
DDC-Sachgruppe: 500 Naturwissenschaften
530 Physik
600 Technik
Dokumenttyp: Journalartikel / Zeitschriftenartikel
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.
DOI der Erstveröffentlichung: 10.3390/ma13215018
Link zu diesem Datensatz: urn:nbn:de:bsz:291--ds-326415
hdl:20.500.11880/30048
http://dx.doi.org/10.22028/D291-32641
ISSN: 1996-1944
Datum des Eintrags: 17-Nov-2020
Fakultät: NT - Naturwissenschaftlich- Technische Fakultät
Fachrichtung: NT - Physik
Professur: NT - Prof. Dr. Uwe Hartmann
Sammlung:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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