Low-Temperature Thermal Conductivity of CeRh$_{2}$As$_{2}$

CeRh $_{2}$ As $_{2}$ is a rare unconventional superconductor ( $T_{c} = 0.26$ K) characterized by two adjacent superconducting phases for a magnetic field $H \parallel c$-axis of the tetragonal crystal structure. Antiferromagnetic order, quadrupole-density-wave order ( $T_{0} = 0.4$ K) and the proximity of this material to a quantum-critical point have also been reported: The coexistence of these phenomena with superconductivity is currently under discussion. Here, we present thermal conductivity and electrical resistivity measurements on a single crystal of CeRh $_{2}$ As $_{2}$ between 60 mK and 200 K and in magnetic fields ( $H ∥ c$ ) up to 8 T. Our measurements at low $T$ verify the Wiedemann-Franz law within the error bars. The $T$ dependence of the thermal conductivity $κ (T)$ shows a pronounced drop below $T_{c}$ which is also field dependent and thus interpreted as the signature of superconductivity. However, the large residual resistivity and the lack of sharp anomalies in $κ (T)$ at the expected transition temperatures clearly indicate that samples of much higher purity are required to gain more information about the superconducting gap structure.

Low-Temperature Thermal Conductivity of CeRh $_{2}$ As $_{2}$

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Low-Temperature Thermal Conductivity of CeRh $_{2}$ As $_{2}$

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Low-Temperature Thermal Conductivity of CeRh22​As22​

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Low-Temperature Thermal Conductivity of CeRh22​As22​

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Low-Temperature Thermal Conductivity of CeRh $_{2}$ As $_{2}$

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Low-Temperature Thermal Conductivity of CeRh $_{2}$ As $_{2}$

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