Discovery of the Type-II Superconductor Ta₄Rh₂C_1-δ with a High Upper Critical Field

2025/06/02 by Ma, KeYuan, López-Paz, Sara, Gornicka, Karolina +3
#FOS: Physical sciences #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.2506.02209

Abstract

We report on the discovery of superconductivity in the previously unknown compound Ta₄Rh₂C_1-δ. Ta₄Rh₂C_1-δ crystallizes in the η-carbide structure type, in the cubic space group Fd3m (No.227) with a unit cell parameter of a = 11.7947 Å. Temperature-dependent magnetic susceptibility, resistivity, and specific heat capacity measurements reveal that Ta₄Rh₂C_1-δ is a type-II bulk superconductor with a critical temperature of T_{\rm c} = 6.4 K, and a normalized specific heat jump ΔC/γT_{\rm c} = 1.56. Notably, we find Ta₄Rh₂C_1-δ has a high upper critical field of μ₀ H_{\rm c2}\rm (0) = 17.4 T, which is exceeding the BCS weak coupling Pauli limit of μ₀ H_{\rm Pauli} = 11.9 T.

Citations

• Ti4Ir2O a time-reversal-invariant fully gapped unconventional superconductor
• LaIr3Ga2: A Superconductor based on a Kagome Lattice of Ir
• Generalized Gradient Approximation Made Simple

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