Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2

N. Berry; C. Capan; G. Seyfarth; A. D. Bianchi; J. Ziller; Z. Fisk

doi:10.1103/PhysRevB.79.180502

Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2

Superconductivity 2009-05-06 v2

Authors: N. Berry , C. Capan , G. Seyfarth , A. D. Bianchi , J. Ziller , Z. Fisk

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Abstract

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.

Keywords

single crystal superconductivity iron-based superconductor superconductivity

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@article{arxiv.0902.4476,
  title  = {Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2},
  author = {N. Berry and C. Capan and G. Seyfarth and A. D. Bianchi and J. Ziller and Z. Fisk},
  journal= {arXiv preprint arXiv:0902.4476},
  year   = {2009}
}

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Published in Phys Rev B: Rapid Communications

Superconductivity without Fe or Ni in the phosphides BaIr2P2 and BaRh2P2

Abstract

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