27Al-NMR studies of the structural phase transition in LaPd2Al2

We performed ²⁷Al-NMR measurements for the CaBe₂Ge₂ type single crystalline LaPd₂Al₂ in the temperature range from 100 K to 5 K to investigate the origin of the structural phase transition. We found that the line profile of the ²⁷Al-NMR spectrum does not change entirely on passing through the structural phase transition at $T_{\mathrm{st}}$. Meanwhile, the peak position of the central line slightly change ($\approx 30$ ppm) below 70 K, suggesting the orbital shift changes below $T_{\mathrm{st}}$. The present ²⁷Al-NMR studies evidence that the local electronic state at Al site is hardly affected by the structural phase transition.