0533111 - FZÚ 2021 RIV GB eng J - Journal Article
Jirsa, Miloš - Rameš, Michal - Miryala, M. - Svora, Petr - Duchoň, Jan - Molnárová, Orsolya - Arvapalli, S.S. - Murakami, M.
Flux pinning and microstructure of a bulk MgB₂ doped with diverse additives.
Superconductor Science and Technology. Roč. 33, č. 9 (2020), s. 1-8, č. článku 094007. ISSN 0953-2048. E-ISSN 1361-6668
R&D Projects: GA MŠMT(CZ) LM2018096
Grant - others:AV ČR(CZ) StrategieAV21/3
Program: StrategieAV
Institutional support: RVO:68378271
Keywords : MgB₂ * MgB₄ * Ag-doping * flux pinning * microstructure analysis * critical currents
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 3.219, year: 2020
Method of publishing: Open access

In MgB2 doped with Ag, the Ag reacts with Mg, forming Mg–Ag phases acting as a vortex pinning medium. In this work, we analyzed the electromagnetic and pinning properties of bulk MgB2 doped with 1 wt% MgB4, 4 wt% Ag, and 1 wt% Dy2O3. In three compounds of MgxB2 + 4 wt% Ag with x = 1, 1.075, and 1.1, the effect of Mg excess was studied. The magnetic moment was measured by a vibrating sample magnetometer. Pinning was studied in terms of the field dependence of the normalized pinning force density, Fn = F/Fmax. In all studied samples, the peak of the Fn(b) dependence (b = B/Birr, Birr being the irreversibility field) was observed at around b = 0.2, indicating a prevailing flux pinning at grain boundaries.
Permanent Link: http://hdl.handle.net/11104/0311595