Discovery of the type-II superconductor Ta4Rh2C1−δ with a high upper critical field
KeYuan Ma, Sara López-Paz, Karolina Gornicka, Harald O. Jeschke, Tomasz Klimczuk, Fabian O. von Rohr
DOI 10.1103/PhysRevResearch.7.023147 · Physical Review Research
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Abstract
We report on the discovery of superconductivity in the previously unknown compound Ta4Rh2C1−δ. Ta4Rh2C1−δ crystallizes in the η-carbide structure type, in the cubic space group Fd3¯m (No. 227) with a unit cell parameter of a=11.7947 Å. Temperature-dependent magnetic susceptibility, resistivity, and specific-heat capacity measurements reveal that Ta4Rh2C1−δ is a type-II bulk superconductor with a critical temperature of Tc=6.4K and a normalized specific-heat jump ΔC/γTc=1.56. Notably, we find that Ta4Rh2C1−δ has a high upper critical field of μ0Hc2(0)=17.4T, which exceeds the BCS weak-coupling Pauli limit of μ0HPauli=11.9T.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ta4Rh2C1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.3 | Pressure not reported | onset |
| Ta4Rh2C1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.4 | Pressure not reported | midpoint |
| Ta4Rh2C1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.2 | Pressure not reported | onset |
| Ta4Rh2C1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | zero_resistance |
| Ta4Rh2C1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.4 | Pressure not reported | unknown |
| Ti4Co2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Ti4Ir2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nb4Rh2C1-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Zr4Pd2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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