Knight Shift and Nuclear Spin-Lattice Relaxation Rate in Solid and Liquid Copper

Measurements of the Knight shift

K

{Cu}^{63}

and the nuclear spin-lattice relaxation rate

{T_{1}}^{- 1}

{Cu}^{63}

and

{Cu}^{65}

are reported for solid and liquid copper. The temperature

T

range covered for the solid is 300°K to the melting point (1356°K). Measurements of

K

in the liquid extend from 1200°K (supercooled) to 1450°K; measurements of

{T_{1}}^{- 1}

cover the range 1200-1370°K. In the solid, the Knight shift shows a slight increase with temperature and, up to about 1000°K, the product

T_{1} T K^{2}

is constant. Above 1000°K, an additional contribution to

{T_{1}}^{- 1}

is observed which is attributed to a quadrupolar interaction with diffusing imperfections. There is a sudden increase of about 3.7% in

K

and 20% in the inferred magnetic contribution to

{T_{1}}^{- 1}

on going from the solid to the liquid state at 1356°K. In the liquid state, both

K

and

T_{1} T

are independent of

T

. The values of

{T_{1}}^{- 1}

in the liquid are consistent with a lack of quadrupolar contribution to

{T_{1}}^{- 1}

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