Comparison of the temperature and field dependencies of the critical current densities of bulk YBCO, MgB2 and iron-based superconductors

Anjela Koblischka-Veneva (1, 2) , Michael Rudolf Koblischka (1, 2) , Kévin Berger (3) , Quentin Nouailhetas (3) , Bruno Douine (3) , Miryala Muralidhar (2) , Masato Murakami (2)

1 Institute of Experimental Physics
2 Department of Materials Science and Engineering
3 GREEN - Groupe de Recherche en Energie Electrique de Nancy

We compare the temperature and field dependence of the critical current densities of high-Tc superconductor materials intended for various bulk applications like trapped-field magnets. This comprises bulk samples of YBa2Cu3Ox (YBCO), MgB2 and iron-based materials, including also various versions of the YBCO compound like melt-textured ones, infiltration-growth processed ones, and YBCO foams. Critical current densities and flux pinning forces were obtained from magnetization loops measured using Quantum Design SQUID and PPMS systems with applied magnetic fields of up to ±9 T. The obtained data are compared to each other with respect of the optimal cooling temperature possible using modern cryocoolers. Furthermore, we plot the temperature dependencies of the critical current densities versus the normalized temperature t = T /Tc. This enables a direct judgement of the performance of the material in the trapped field applications.

Mots clés: temperature dependence; YBCO; critical currents; MgB2; iron-based superconductors

Domaines: Supraconductivité [cond-mat.supr-con]; Energie électrique; Science des matériaux [cond-mat.mtrl-sci]

Anjela Koblischka-Veneva, Michael Rudolf Koblischka, Kévin Berger, Quentin Nouailhetas, Bruno Douine, et al.. Comparison of the temperature and field dependencies of the critical current densities of bulk YBCO, MgB2 and iron-based superconductors. IEEE Transactions on Applied Superconductivity, 2019, 29 (5), pp.1-5. ⟨10.1109/TASC.2019.2900932⟩. ⟨hal-01988008v1⟩