25Mg NMR study of the MgB2 superconductor
M. Mali, J. Roos, A. Shengelaya, H. Keller, K. Conder
DOI 10.1103/PhysRevB.65.100518 · Physical Review B
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Abstract
25Mg NMR spectra and nuclear-spin-lattice relaxation time T1 have been measured in polycrystalline MgB2 with a superconducting transition temperature Tc=39 K in zero magnetic field. From the first-order and second-order quadrupole perturbed NMR spectrum a quadrupole coupling frequency νQ=222.0(1.5) kHz is obtained. T1T=1090(50) sK and Knight shift Kc=242(4) ppm are temperature independent in the normal conducting phase. The 25Mg Korringa ratio equals to 0.95 which is very close to the ideal value of unity for s electrons. The comparison of the experimental νQ, T1T, and Kc with the corresponding values obtained by LDA calculations shows an excellent agreement for all three quantities.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure unresolved | unknown |
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