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Magnetization, AC susceptibility and $\mu$SR measurements have been performedin neutral phthalocyaninato lanthanide ([LnPc$_2]^0$) single molecule magnetsin order to determine the low-energy levels structure and to compare thelow-frequency spin excitations probed by means of macroscopic techniques, suchas AC susceptibility, with the ones explored by means of techniques ofmicroscopic character, such as $\mu$SR. Both techniques show a high temperaturethermally activated regime for the spin dynamics and a low temperaturetunneling one. While in the activated regime the correlation times for the spinfluctuations estimated by AC susceptibility and $\mu$SR basically agree, cleardiscrepancies are found in the tunneling regime. In particular, $\mu$SR probesa faster dynamics with respect to AC susceptibility. It is argued that thetunneling dynamics probed by $\mu$SR involves fluctuations which do not yield anet change in the macroscopic magnetization probed by AC susceptibiliy. Finallyresistivity measurements in [TbPc$_2]^0$ crystals show a high temperaturenearly metallic behaviour and a low temperature activated behaviour.

Spin and charge dynamics in [TbPc$_2$]$^0$ and [DyPc$_2$]$^0$ single molecule magnets