Superconductivity of Ba1 ? xKxBiO3 (0.35 < x < 1) Synthesized by the High Pressure and High Temperature Technique |
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Authors: | D C Kim A N Baranov J S Kim H R Kang B J Kim Y C Kim J S Pshirkov E V Antipov and Y W Park |
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Affiliation: | (1) School of Physics and Condensed Matter Research Institute, Seoul National University, Seoul, 151-747, Korea;(2) Department of Physics, Pusan National University, Pusan, 609-735, Korea;(3) Department of Chemistry, Moscow State University, 119899 Moscow, Russia |
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Abstract: | Ba1 – x
K
x
BiO3 (BKBO) samples with 0.35 < x < 1 were synthesized by the high pressure and high temperature technique. XRD analysis showed that the BKBO samples were single phase for the whole range of the potassium doping concentration. The change of superconducting transition temperature, T
c, as well as lattice parameters have been investigated upon doping concentration. As the K doping concentration (x) increases from x = 0.37, T
c decreases from 30.4 K to almost zero at x = 0.74. However, in some BKBO samples without including any barium in the starting composition (x = 1), which is denoted as KBO samples, superconductivity is observed with T
c as high as 9 K with partial substitutions of Bi at the K site. Depending on the synthesis condition of the KBO samples, T
c and lattice parameters were different from sample to sample. Compared with other superconducting bismuthates, the evolution of T
c by potassium doping in the cubic BKBO system is discussed in terms of its electronic band structure. |
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Keywords: | Ba1 – x
K
x
BiO3 high pressure and high temperature technique K doping concentration KBO |
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