Transport measurement of 32 K superconductivity in the Ba-K-Bi-O system

Jin, S.; Tiefel, T. H.; Sherwood, R. C.; Ramirez, A. P.; Gyorgy, E. M.; Kammlott, G. W.; Fastnacht, R. A.
September 1988
Applied Physics Letters;9/19/1988, Vol. 53 Issue 12, p1116
Academic Journal
We have successfully measured the electrical resistance of Ba-K-Bi-O as a function of temperature and magnetic field, and thus confirmed the existence of superconductivity in the compound by transport measurement. The results from dense, black-colored samples prepared from a starting composition with excess potassium (Ba0.6K1.2BiOx) indicate Tc (onset)∼32 K and Tc (R=0)∼22 K with a slightly negative temperature dependence of normal state resistance [R(300 K)/R(33 K)∼0.8]. The strong field dependence of the superconducting transition (500–1000 Oe/K) indicates the likelihood of a relatively low Hc in Ba-K-Bi-O.


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