Ni2X2 (X = pnictide,chalcogenide, or B) based superconductors |
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| Authors: | F Ronning ED Bauer T Park N Kurita T Klimczuk R Movshovich AS Sefat D Mandrus JD Thompson |
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| Institution: | 1. Los Alamos National Laboratory, Los Alamos, NM 87545, USA;2. Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea;3. Faculty of Applied Physics and Mathematics, Gdansk University of Technology, Narutowicza 11/12, 80-952 Gdansk, Poland;4. Material Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
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| Abstract: | We review the properties of Ni-based superconductors which contain Ni2X2 (X = As, P, Bi, Si, Ge, B) planes, a common structural element found also in the recently discovered FeAs superconductors. Strong evidence for the fully gapped nature of the superconducting state has come from field dependent thermal conductivity results on BaNi2As2. Coupled with the lack of magnetism, the majority of evidence suggests that the Ni-based compounds are conventional electron–phonon mediated superconductors. However, the increase in Tc in LaNiAsO with doping is anomalous, and mimics the behavior in LaFeAsO. Furthermore, comparisons of the properties of Ni- and Fe-based systems show many similarities, particularly with regards to structure–property relationships. This suggests a deeper connection between the physics of the FeAs superconductors and the related Ni-based systems which deserves further investigation. |
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