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Berlin 2015 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Properties and Electronic Structure

TT 17.12: Talk

Monday, March 16, 2015, 18:00–18:15, H 2053

Magnetic characterization of Ag-addet Bulk MgB2 — •Alex Wiederhold1, Michael Koblischka1, Kazuo Inoue2, Miryala Muralidhar2, Masato Murakami2, Thomas Hauet3, and Uwe Hartmann11Institute of Experimental Physics, Saarland University, P. O. Box 151150, D-66123 Saarbrücken, Germany — 2Department of Material Science and Engeneering, Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo 135-8548, Japan — 3Institute Jean Lamour, Université de Lorraine, Vandœuvre-les-Nancy, France

n earlier studies, it was found that bulk sintered MgB2 samples contained numerous voids which hinder the current flow. Therefore, a series of bulk MgB2 superconductors with Ag contents of 0-10 wt% was prepared in order to improve the critical current densities and the mechanical performance. Several samples were fabricated using a solid state reaction in pure Ar atmosphere at the optimal reaction temperature of 775 C. Thorough microstructural observations obtained from scanning electron microscopy (SEM) and atomic force microscopy (AFM) indicate that metallic Ag particles are embedded in the void regions.Furthermore, nanometer-sized AgMg3 particles are also present within the MgB2 matrix, leading to improved flux pinning. Small samples cut from the bulks were characterized by transport measurements (R(T,B) and I/V characteristics) in magnetic fields up to 8 T and by magnetization loops measured using a SQUID magnetometer.

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