Abstract
We analyze and discuss two distinct resonance phenomena at high nuclear polarizations, which give independent experimental information about the exchange couplings, direct or indirect, between the nuclear spins in solids. In cases of more than one isotope with a nuclear spin, there is an isotopic-interference effect, sometimes referred to as a suppression-enhancement effect. Even in cases with just one spin species, one may observe harmonic lines of the ordinary Larmor resonance. By analyzing the shifts and intensities of the resonance lines as functions of the nuclear polarization, one can find the sign and magnitude of the exchange couplings. The focus of this paper is in experiments on nuclear magnetic ordering in pure metals. We present studies on copper, silver, rhodium, thallium, and gold, and discuss shortly our ongoing work on lithium.
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