The TlCa1−x Lnx Sr2 Cu2 O7+δ(Ln = rare earth) system shows electron-superconductivity when x= 0.25 and hole-superconductivity when x> 0.25. The Tc is generally in the 60–90K in both these regimes. TlSr2−x Lax CuOy (1021) also show electron or hole superconductivity (Tc∼40K) depending on x.
Cnr Rao, R. Nagarajan, R. Vijayaraghavan, N.Y. Vasanthacharya, Giridhar U. Kulkarni, Guanghui Rao, A.M. Umarji, P. Somasundaram, G. N. Subbanna, A. R. Raju, A. K. Sood, N. Chandrabhas
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