Conventional $s$-wave Superconductivity in LaRh$_2$As$_2$; the Analog without the 4$f$ Electrons of CeRh$_2$As$_2$

Superconductor LaRh $_{2}$ As $_{2}$ has the same crystal structures as CeRh $_{2}$ As $_{2}$ , which exhibits superconducting (SC) multiphase in the $c$ -axis magnetic field. Although the SC transition temperatures $T_{c}$ are similar, around 0.3 K, LaRh $_{2}$ As $_{2}$ shows conventional type-II superconductivity with a small upper critical field $H_{c 2} \sim$ 10 mT. At present, the SC properties of LaRh $_{2}$ As $_{2}$ have not been clarified yet. We performed $^{75}$ As-nuclear quadrupole resonance (NQR) measurements on LaRh $_{2}$ As $_{2}$ to investigate the SC properties and gap structure. $1 / T_{1}$ shows a clear coherence peak just below $T_{c}$ and an exponential decrease at lower temperatures, suggesting full-gap $s$ -wave superconductivity. The numerical calculations based on an $s$ -wave SC model reveal an SC gap size of $Δ (0) / k_{B} T_{c} \sim 1.48$ , consistent with the weak-coupling $s$ -wave superconductivity. These results suggest that the 4 $f$ electrons in CeRh $_{2}$ As $_{2}$ not only enhance the orbital limiting field but also contribute to the formation of unconventional superconductivity with SC multiphase.

Conventional $s$ -wave Superconductivity in LaRh $_{2}$ As $_{2}$ ; the Analog without the 4 $f$ Electrons of CeRh $_{2}$ As $_{2}$

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Conventional $s$ -wave Superconductivity in LaRh $_{2}$ As $_{2}$ ; the Analog without the 4 $f$ Electrons of CeRh $_{2}$ As $_{2}$

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Conventional ss-wave Superconductivity in LaRh22​As22​; the Analog without the 4ff Electrons of CeRh22​As22​

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Conventional ss-wave Superconductivity in LaRh22​As22​; the Analog without the 4ff Electrons of CeRh22​As22​

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Conventional $s$ -wave Superconductivity in LaRh $_{2}$ As $_{2}$ ; the Analog without the 4 $f$ Electrons of CeRh $_{2}$ As $_{2}$

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Conventional $s$ -wave Superconductivity in LaRh $_{2}$ As $_{2}$ ; the Analog without the 4 $f$ Electrons of CeRh $_{2}$ As $_{2}$

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