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Synthesis of bulk high Tc superconductors of TlBa2Can −1CunO2n + 3 (n = 2 − 5)

1989; Elsevier BV; Volume: 158; Issue: 3 Linguagem: Inglês

10.1016/0921-4534(89)90246-3

1873-2143

Satoru Nakajima, Masae Kikuchi, Yasuhiko Syono, Takeo Oku, Daisuke Shindo, K. Hiraga, Norio Kobayashi, M. Iwasaki, Yoshio Mutô,

Superconductivity in MgB2 and Alloys

Bulk specimens of high Tc superconductors of TlBa2Can − 1CunO2n + 3 (n = 2 − 5) have been synthesized by heat treatment up to 10 hours. Crystal structures were analyzed by X-ray powder diffraction and high resolution electron microscopy, and superconducting properties were determined by resistivity and DC susceptibility measurements. Tc increases with increasing number of Cu layers up to n = 4, where it turns down.