Longitudinal detection of pulsed low-frequency, low-temperature nuclear magnetic resonance using a dc SQUID

We present our new setup of longitudinal nuclear magnetic resonance detected by a superconducting quantum interference device, It was built specifically for the study of metallic single crystals at low frequency, We report the main difficulties encountered with such measurements, mainly thermal effects which are usually barely discussed in the literature although they put the true limit of such measurements, We also illustrate in detail the actual performances of our experiment on different test samples up to the first measurement of a metallic single crystal with such a technique. (C) 1998 American Institute of Physics.