Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2

Details Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2 Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2

2009-02-26

arxiv.org/abs/0902.4476v2

Phys. Rev. B 79, 180502 (2009)

Physics

Condensed Matter

Superconductivity

Published in Phys Rev B: Rapid Communications

Scientific paper

10.1103/PhysRevB.79.180502

Heat capacity, resistivity, and magnetic susceptibility measurements confirm bulk superconductivity in single crystals of BaIr$_2$P$_2$ (T$_c$=2.1K) and BaRh$_2$P$_2$ (T$_c$ = 1.0 K). These compounds form in the ThCr$_2$Si$_2$ (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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