A supercurrent is a superconducting current, that is, electric current which flows without dissipation in a superconductor. Under certain conditions, an electric current can also flow without dissipation in microscopically small non-superconducting metals. However, currents in such perfect conductors are not called supercurrents, but persistent currents.
References
Jones, Andrew Zimmerman. "supercurrent - definition of a supercurrent". About.com Physics. Archived from the original on 6 September 2015. Retrieved 5 June 2013. https://web.archive.org/web/20150906072232/http://physics.about.com/od/physicsqtot/g/supercurrent.htm ↩
Christopher L. Henley. "Lecture 6.4 - Supercurrent and critical currents". States in Solids (PDF). (unpublished). Archived from the original (PDF) on 22 December 2011. https://web.archive.org/web/20111222125818/http://people.ccmr.cornell.edu/~clh/BT-GL/6.4.pdf ↩
Hirsch, J. E. (2004). "Electrodynamics of superconductors". Physical Review B. 69 (21): 214515. arXiv:cond-mat/0312619. Bibcode:2004PhRvB..69u4515H. doi:10.1103/PhysRevB.69.214515. S2CID 119086582. /wiki/ArXiv_(identifier) ↩