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Effect of Hf and HfCa substitution on the superconductivity of ErBa2Cu3O7−δ

✍ Scribed by U.S. Joshi; K.M. Pansuria; D.G. Kuberkar; G.J. Baldha; R.G. Kulkarni

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
431 KB
Volume
261
Category
Article
ISSN
0921-4534

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✦ Synopsis

The structural and superconducting properties of (Erl_x_yCayHfx)Ba2Cu30 z samples are investigated using X-ray diffraction, resistivity, AC susceptibility and oxygen-content measurements. The effect of increasing the Hf concentration in Erl_xHfxBa2Cu30 z lowers the oxygen content and decreases T~ which is attributed to hole filling by Hf. The substitution of Ca for Er in (Ero.85_yCayHfo.15)Ba2Cu30 z provides a proper matching between the ionic radius and valence of Er 3+ (0.88 A) and the average ionic radius and valence of Hf 4+ (0.78 A) and Ca 2+ (0.99 A). As the Ca content increases, the T c increases from 70 K (y = 0.05) to 86 K (y = 0.25, compensated oxide), closer to the value of 91 K for pure ErBa2Cu307_ 8 due to the balance between the hole filling by Hf and hole doping by Ca.

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