Comparison of the 11B MAS (dashed grey line) and static spectra (solid black line) for a dilute sample of MgB2 (see text). (a) Normal state, 8.5 T, ω r /2π = 22 kHz MAS. (b) SC state, 8.5 T, ω r /2π = 11.2 kHz MAS. (c) Normal state, 4.7 T, ω r /2π = 22 kHz MAS. (d) SC state, 4.7 T, ω r /2π = 15 kHz MAS.
11B peak position for MgB2 versus temperature for static (triangles and dashed error bars) and MAS (squares and solid error bars) data. (a) 8.5 T. (b) 4.7 T. The confidence limits are the linewidths (half-width half-maximum).
1/T 1 versus temperature for MgB2 at (a) 4.7 T and static, (b) 4.7 T and spinning, (c) 8.5 T and static, (d) 8.5 T and spinning. Linear fits of data points above T c are field independent, with T 1 T = (152 ± 5) s K.
Static 1/T 1 versus temperature data for Mg(B0.94C0.06)2 at (a) 4.7 T and (b) 8.5 T. From linear fits of data points above T c , T 1 T = (160 ± 18) s K.
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