Boron substitution in ternary metal phosphide superconductors

R. E. Schaak, R. J. Cava

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Partial substitution of boron for phosphorus in the ternary phosphide superconductors ZrRuP and LaRu2P2 induces highly anisotropic structural changes and suppresses the superconducting transition temperatures. Undoped ZrRuP [hexagonal, a=6.445(4)Å, c=3.765(2)Å] systematically expands for ZrRuP1-xBx (x=0.05, 0.10, 0.15, 0.20, 0.40) in the a direction to 6.949(4)Å and shrinks in the c direction to 3.601(3)Å. Superconductivity is still present in the boron-substituted samples, although Tc drops from 10.1K in ZrRuP to 5.6K in ZrRuP0.6B0.4. LaRu2P2 [tetragonal, a=4.032(2)Å, c=10.632(7)Å] remains essentially unchanged along the a axis [a=4.037(1)Å] upon substitution at a starting composition of LaRu2P1.6B0.4, but shrinks along the c axis to 10.477(5)Å. Accordingly, the superconducting Tc drops from 4.0K for LaRu2P2 to 2.0K for LaRu 2P1.6B0.4.

Original languageEnglish (US)
Pages (from-to)1231-1235
Number of pages5
JournalMaterials Research Bulletin
Issue number9
StatePublished - Jul 2 2004

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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