Superconductivity in the Ladder Material Sr<sub>0.4</sub>Ca<sub>13.6</sub>Cu<sub>24</sub>O<sub>41.84</sub>
M. Uehara(Aoyama Gakuin University), Takashi Nagata(Aoyama Gakuin University), Jun Akimitsu(Aoyama Gakuin University), Hiroki Takahashi(The University of Tokyo), Nobuo Môri(The University of Tokyo), Kyôichi Kinoshita(NTT (United States))
Cited by 749
Abstract
We have observed superconductivity in the ladder material Sr 0.4 Ca 13.6 Cu 24 O 41.84 under pressures of 3 GPa and 4.5 GPa by means of electrical measurements. The superconducting transition temperatures T c (onset) are 12 K and 9 K at 3 and 4.5 GPa, respectively. The superconducting volume fraction was obtained to be about 5% from magnetization measurement under 3.5 GPa at 4.2 K, indicating the bulk nature of the superconductivity in this system.
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