Abstract
We report measurements of the Knight shift (κ55) and spin-lattice relaxation time (T1) for Mn55 in liquid Mn and in the solid γ (FCC) and δ (BCC) phases over the temperature range 1 350 ⩽ T ⩽ 1 575 K. The value of κ55 in liquid Mn at 1 525 K is - 0.820 ± 0.005 % and 1/T1 is 2.2 ± 0.1 × 104 s-1. Detailed analysis of the temperature dependent Knight shifts and magnetic susceptibilities (χ) show that the d-spin susceptibility (χd) is responsible for roughly 75 % of the total susceptibility, the remainder being due mainly to orbital paramagnetism (χorb). The values of χd in liquid and solid δ-Mn are equal to within about 2 % and both are greater than in γ-Mn by about 10 %. Core polarization hyperfine couplings in the range - 225 ± 25 kG/Bohr magneton are deduced for all three phases. The relaxation rates in liquid and solid are consistent with Korringa relaxation by itinerant d-electrons.
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