Pressure Dependence of the Internal Field at the 59Co Nucleus in a 99.5% Ni-0.5% Co Alloy

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Abstract
The room‐temperature nuclear magnetic resonance absorption of 59Co in an alloy of 0.5% Co in Ni has been measured under hydrostatic pressures of up to 7 kbars. The change in the resonance frequency with pressure is Δv/Δp=159±5 Hz/bar. This is in the same direction (increasing frequency for increasing pressure) as for 61Ni in Ni. The ratio of the resonance frequency at absolute zero to the change in frequency with pressure v0: Δv/Δp is 750 kbar for 59Co and 1200 kbar for 61Ni in Ni. The internal field at the 59Co nucleus decreases with increasing temperature more slowly than that at the 61Ni nucleus in Ni‐rich Ni‐Co alloys. This discrepancy in the temperature dependences remains as large, when plotted at constant volume, as it was at constant pressure.