Conditions for the onset of vaporization in superfluid liquid He II in the presence of heat flow

We report on the synthesis and the superconductivity of Zr 4 Rh 2 O x (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 Ti 2 Ni structure. We find that in the system Zr 4 Rh 2 O x , already a small amount (x ≥ 0.4) of oxygen addition stabilizes the η-carbide structure over the more common intermetallic CuAl 2 structure-type, in which Zr 2 Rh crystallizes. We show that Zr 4 Rh 2 O 0.7 and Zr 4 Rh 2 O are bulk superconductors with critical temperatures of T c ≈ 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 µ 0 H c1 (0) ≈ 8.8 mT and µ 0 H c2 (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.

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Conditions for the onset of vaporization in superfluid liquid He II in the presence of heat flow

Cited by 3 publications

References 9 publications

Heat Transfer from Thin Wires to Superfluid Helium under Reduced Gravity

Heat Transfer from Thin Wires to Superfluid Helium under Reduced Gravity

Liquid Disorder Effects on the Solid He II Kapitza Resistance

Superconductivity in the η-carbide-type oxides Zr4Rh2Ox

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