Nuclear Magnetic Resonance in Metals. II. Temperature Dependence of the Resonance Shifts

Abstract

The temperature dependence of the nuclear resonance shift in metals has been investigated in lithium, sodium, rubidium, cesium, and gallium. The resonance shifts were found to change by no more than 5 to 6 percent over temperature ranges of 200°, including the melting point. For sodium, the observed temperature dependence of the resonance shift is correlated directly with the volume dependence predicted theoretically for the mass magnetic susceptibility due to the conduction electrons. In the other metals, effects appear which are related apparently to the volume dependence of the wave functions for electrons at the top of the conduction band. The room temperature resonance shifts of Sn¹¹⁷ and Sn¹¹⁹ and the temperature dependence of the Rb⁸⁷ line width are also reported for the metals. The resonance shift of tin is 0.705×10⁻². The estimation of activation energies for self‐diffusion from the temperature dependence of the line widths is discussed.