Pressure effects on Knight shifts of rare-earth and pnictide nuclei, contained in intermetallic compounds, have been measured to 4 kbar as a function of temperature from 4 K to as high as 300 K. An attempt to separate the effects of crystal field and exchange was made. Even with the inclusion of exchange (via simple parameterization), the often used point-charge model is unable to account in a straightforward manner for the results. We attribute the behavior to conduction-electron effects.
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Weaver et al. (1976) studied this question.
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