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Enhancement of superconductivity in Y(Ba1−xCax)2Cu4O8

✍ Scribed by T.H. Meen; F.L. Juang; Y.C. Chen; H.D. Yang

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
142 KB
Volume
194-196
Category
Article
ISSN
0921-4526

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✦ Synopsis

Y(Bal.xCax)2Cu40 s (0<x_~<0.1) have been investigated by means of x-ray diffraction and electricalresistivity measurements. X-ray-diffraction patterns show that all samples contain the single YBa2Cu408 phase. Lattice parameters a, b and c decrease with the Ca concentration. Zero resistance temperature Too increases from 79 K at x=0 to 90.5 K at x=0.075, and then decreases to 88 K at x=0.1. These results can be interpreted that the Ca is doped on the Ba site which induces an internal pressure resulting in the charge transfer from Cu-O chains to Cut 2 planes and a significant enhancement of T c.

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