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Browsing by Author "Umarji, A M"

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Occurrence of maximum Tc at an optimal carrier concentration in superconducting bismuth and thallium cuprates

Somasundaram, P; Vijayaraghavan, R; Nagarajan, R; Seshadri, Ram; Umarji, A M; Rao, C N R (American Institute of Physics, 1990-01-29)

The superconducting transition temperatures in Bi2Ca1−xLnxSr2Cu2O8+δ, TlCa1−xLnxSr2Cu2O6+δ, and Tl0.8Ca1−xLnxBa2Cu23O6+δ (Ln=Y or rare earth) vary with composition and show a maximum at a specific value of x or δ. This ...
Superconducting cuprates of the series Bi2Ca1-xLnxSr2Cu2O8+ δ (Ln=rare earth or Y)

Rao, C N R; Nagarajan, R; Vijayaraghavan, R; Vasanthacharya, N Y; Kulkarni, G U; Rao, G Ranga; Umarji, A M; Somasundaram, P; Subbanna, G N; Raju, A R; Sood, A K; Narayana, Chandrabhas (IOP Publishing Ltd, 1990-05)

A systematic investigation of the properties of the series Bi2Ca1-xLnxSr2Cu2O8+ delta (Ln-rare earth or Y) of superconducting cuprates has been carried out by employing a variety of techniques. In these cuprates, the a and ...
Synthesis and characterization of superconducting YbBa2Cu3O7−δ and Y1−xLuxBa2Cu3O7−δ (0.0 < x < 0.75) : Lower limit of the rare-earth ion radius tolerated in the 123 cuprate system

Somasundaram, P; Ram, A M; Umarji, A M; Rao, C N R (Pergamon-Elsevier Science Ltd, 1990-03)

YbBa2Cu3O7−δ with a Tc (zero-resistance) of 89K has been prepared without contamination of Yb2BaCuO5. Monophasic LuBa2Cu3O7−δ cannot be prepared. Solid solutions of the type Y1 xLuxBa2Cu3O7−δ (0.0 < x ≤ slant 0.75) are, ...

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