Conventional type-II superconductivity in locally noncentrosymmetric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">LaRh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">As</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math> single crystals

We report on the observation of superconductivity in $\mathrm{La}{\mathrm{Rh}}_{2}{\mathrm{As}}_{2}$, which is analog without $f$ electrons heavy-fermion system with two superconducting phases $\mathrm{Ce}{\mathrm{Rh}}_{2}{\mathrm{As}}_{2}$ [S. Khim et al., Science 373, 1012 (2021)]. A zero-resistivity transition, a specific-heat jump, and drop magnetic ac susceptibility consistently point to transition at temperature ${T}_{c}=0.28$ K. The magnetic-field phase diagrams determined from field-dependent ac-susceptibility measurements reveal small upper critical fields ${\ensuremath{\mu}}_{0}{H}_{c2}\ensuremath{\approx}12$ mT for $H\ensuremath{\parallel}ab$ ${\ensuremath{\mu}}_{0}{H}_{c2}\ensuremath{\approx}9$ $H\ensuremath{\parallel}c$. observed ${H}_{c2}$ larger than estimated thermodynamic critical-field ${H}_{c}$ derived heat-capacity data, suggesting that $\mathrm{La}{\mathrm{Rh}}_{2}{\mathrm{As}}_{2}$ type-II superconductor Ginzburg-Landau parameters ${\ensuremath{\kappa}}_{GL}^{ab}\ensuremath{\approx}1.9$ ${\ensuremath{\kappa}}_{GL}^{c}\ensuremath{\approx}2.7$. microscopic Eliashberg theory indicates be weak-coupling regime an electron-phonon-coupling constant ${\ensuremath{\lambda}}_{e\ensuremath{-}ph}\ensuremath{\approx}0.4$. Despite similar ${T}_{c}$ same crystal structure as Ce compound, displays conventional superconductivity, corroborating substantial role $4f$ extraordinary state $\mathrm{Ce}{\mathrm{Rh}}_{2}{\mathrm{As}}_{2}$.