Vortex pinning by mesoscopic defects: A way to levitation at liquid oxygen temperature

Muralidhar, M.; Sakai, N.; Jirsa, M.; Koshizuka, N.; Murakami, M.
December 2003
Applied Physics Letters;12/15/2003, Vol. 83 Issue 24, p5005
Academic Journal
The addition of long-term Zr[sub 2]O[sub 3]-ball milled Gd[sub 2]BaCuO[sub 5] particles to a standard (Nd,Eu,Gd)Ba[sub 2]Cu[sub 3]O[sub y] superconductor led to a spontaneous formation of extremely small (20–50 nm) Zr-rich (Nd,Eu,Gd)–Ba–Cu–O particles during the melt-growth process. This pinning medium, approaching the interesting physical limit of point-like pins from the side of large normal ones, dramatically enhanced supercurrents up to 90 K, both in low and intermediate fields. As a result, levitation experiment could be performed with liquid oxygen as a coolant. The particle size effect resemblance with fast neutron irradiation of RE–Ba–Cu–O single crystals is discussed. © 2003 American Institute of Physics.


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