The 23 K superconducting phase YPd2B2C |
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Authors: | YY Sun I Rusakova RL Meng Y Cao P Gautier-Picard CW Chu |
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Institution: | a Texas Center for Superconductivity, University of Houston, Houston TX 77204-5932, USA b Department of Physics, University of Houston, Houston, TX 77204-5932, USA |
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Abstract: | We have carried out a systematic structural, electric, and magnetic study on Y---Pd---B---C samples with different compositions with emphasis on the as-cast and annealed YPd5B3C0.3 which was first reported to superconduct at 23 K by Cava et al. We found that the tetragonal body-centered YPd2B2C with lattice parameters a=3.71 Å and c=10.81 Å is the phase responsible for the 23 K superconductivity and that YPd2B2C is metastable, which is consistent with the suggestion made by Cava et al. 1]: it is not stable at high temperatures nor stabilizable by Ni doping, although its isostructural compound, YNi2B2C, exists. Two new phases with Y:Pd ratios of 1:7 and 2:3, respectively, have also bee detected. |
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