Pinning characteristics in chemically modified (Nd, Eu, Gd)–Ba–Cu–O superconductors

Muralidhar, M.; Sakai, N.; Nishiyama, M.; Jirsa, M.; Machi, T.; Murakami, M.
February 2003
Applied Physics Letters;2/10/2003, Vol. 82 Issue 6, p943
Academic Journal
In melt-processed (Nd[sub 0.33]Eu[sub 0.38]Gd[sub 0.28])Ba[sub 2]Cu[sub 3]O[sub y] (NEG-123) materials we found a new type of nanometer-scale pinning defects. Structural analysis was made with a dynamic force microscope and a scanning tunneling microscope (STM) that both showed the formation of a nanometer-scale lamellar structure. The high magnification STM showed that the nanolamellas are in fact rows (or planes) of aligned NEG-rich clusters 3-4 nm in size. This new pinning medium led to an increase of B[sub irr] at 77 K for the H[sub II] c axis up to 12 T (measured by a superconducting quantum interference device) or 15 T (measured by a vibrating sample magnetometer). A secondary peak as high as 70 kA/cm² was observed at 4.5 T and decreased to 49 and 22 kA/cm² at 7 and 10 T, respectively.


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