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Scientific article
English

Superconductivity in the η-carbide-type oxides Zr4Rh2Ox

Published inJournal of alloys and compounds, vol. 796, p. 287-292
Publication date2019-08-05
Abstract

We report on the synthesis and the superconductivity in Zr4Rh2Ox (x = 0.4, 0.5, 0.6, 0.7, 1.0). These compounds crystallize in the η-carbide structure, which is a filled version of the complex intermetallic Ti2Ni structure. We find that in the system Zr4Rh2Ox, already a small amount (x ≥ 0.4) of oxygen addition stabilizes the η-carbide structure over the more common intermetallic CuAl2 structure-type, in which Zr2Rh crystallizes. We show that Zr4Rh2O0.7 and Zr4Rh2O are bulk superconductors with critical temperatures of Tc ≈ 2.8 K and 4.7 K in the resistivity, respectively. Our analysis of the superconducting properties reveal both compounds to be strongly type-II superconductors with critical fields up to μ0Hc1(0) ≈ 8.8 mT and μ0Hc2(0) ≈ 6.08 T. Our results support that the η-carbides are a versatile family of compounds for the investigation of the interplay of interstitial doping on physical properties, especially for superconductivity.

eng
Keywords
  • Oxides
  • Carbides
  • Superconductivity
  • Intermetallics
  • Ti2Ni-structure
  • CuAl2-structure
  • η-carbides
Affiliation Not a UNIGE publication
Research group
Citation (ISO format)
MA, KeYuan, LAGO, Jorge, VON ROHR, Fabian. Superconductivity in the η-carbide-type oxides Zr<sub>4</sub>Rh<sub>2</sub>O<sub>x</sub>. In: Journal of alloys and compounds, 2019, vol. 796, p. 287–292. doi: 10.1016/j.jallcom.2019.04.318
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ISSN of the journal0925-8388
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