Discovery of the Type-II Superconductor Ta$_4$Rh$_2$C$_{1-δ}$ with a High Upper Critical Field

We report on the discovery of superconductivity in the previously unknown compound Ta $_{4}$ Rh $_{2}$ C $_{1 - δ}$ . Ta $_{4}$ Rh $_{2}$ C $_{1 - δ}$ crystallizes in the $η$ -carbide structure type, in the cubic space group $F d \overset{ˉ}{3} m$ (No.227) with a unit cell parameter of $a =$ 11.7947 Å. Temperature-dependent magnetic susceptibility, resistivity, and specific heat capacity measurements reveal that Ta $_{4}$ Rh $_{2}$ C $_{1 - δ}$ is a type-II bulk superconductor with a critical temperature of $T_{c}$ = 6.4 K, and a normalized specific heat jump $Δ C / γ T_{c}$ = 1.56. Notably, we find Ta $_{4}$ Rh $_{2}$ C $_{1 - δ}$ has a high upper critical field of $μ_{0} H_{c 2} (0)$ = 17.4 T, which is exceeding the BCS weak coupling Pauli limit of $μ_{0} H_{P a u l i}$ = 11.9 T.

Discovery of the Type-II Superconductor Ta $_{4}$ Rh $_{2}$ C $_{1 - δ}$ with a High Upper Critical Field

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Discovery of the Type-II Superconductor Ta $_{4}$ Rh $_{2}$ C $_{1 - δ}$ with a High Upper Critical Field

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Discovery of the Type-II Superconductor Ta44​Rh22​C1−δ1−δ​ with a High Upper Critical Field

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Discovery of the Type-II Superconductor Ta44​Rh22​C1−δ1−δ​ with a High Upper Critical Field

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Discovery of the Type-II Superconductor Ta $_{4}$ Rh $_{2}$ C $_{1 - δ}$ with a High Upper Critical Field

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Discovery of the Type-II Superconductor Ta $_{4}$ Rh $_{2}$ C $_{1 - δ}$ with a High Upper Critical Field

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AI智能校验