Journal
PHYSICAL REVIEW B
Volume 79, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.180502
Keywords
barium compounds; crystal structure; electrical resistivity; iridium compounds; magnetic susceptibility; rhodium compounds; specific heat; stoichiometry; superconducting transition temperature
Funding
- NSF [DMR 0854781]
- Natural Sciences and Engineering Research Council of Canada
- Fonds Quebecios de la Recherche sur la Nature et les Technologies
- Canada Research Chair Foundation
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Heat capacity, resistivity, and magnetic susceptibility measurements confirm bulk superconductivity in single crystals of BaIr2P2 (T-c=2.1 K) and BaRh2P2 (T-c=1.0 K). These compounds form in the ThCr2Si2 (122) structure so they are isostructural to both the Ni and Fe pnictides but not isoelectronic to either of them. This illustrates the importance of structure for the occurrence of superconductivity in the 122 pnictides. Additionally, a comparison between these and other ternary phosphide superconductors suggests that the lack of interlayer P-P bonding favors superconductivity. These stoichiometric and ambient pressure superconductors offer an ideal playground to investigate the role of structure for the mechanism of superconductivity in the absence of magnetism.
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