Analysis of ²⁷Al- and ⁹³Nb-NMR spectra of PrNb₂Al₂₀ single crystal

We report the results of ²⁷Al- and ⁹³Nb- nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements in PrNb₂Al₂₀ single crystals. The field angle dependence of the observed ⁹³Nb-NMR lines for the single crystal at around 5 T and at 50 K is reproduced by a simulation using previously reported NQR parameters ν_Q,Nb ≈ 1.82 MHz and η_Nb ≈ 0, while ²⁷Al-NMR lines were not reproduce by the previously reported NQR parameters ν_Q,Al(3) ≈ 1.53 MHz and η_Al(3) ≈ 0.17. By reexamining and reconsidering the NMR and NQR lines for powder samples, we obtained a correct NQR parameters for Al(3) site to be ν_Q,Al(3),new ≈ 1 MHz and η_Al(3),new ≈ 0.4.