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²5Mg NMR study of the MgB₂ superconductor

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arxiv cond-mat/0111022 v2 pith:N56PVSZB submitted 2001-11-01 cond-mat.supr-con

²5Mg NMR study of the MgB₂ superconductor

M. Mali (1) , J. Roos (1) , A. Shengelaya (1) , H. Keller (1) , K. Conder (2) ((1) Physics Institute , University of Zurich , Switzerland , (2) Laboratory for Neutron Scattering
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ETH Zurich PSI Villigen Switzerland)
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^25Mg NMR spectra and nuclear spin-lattice relaxation time, T_1, have been measured in polycrystalline ^25MgB_2 with a superconducting transition temperature T_c = 39.0 K in zero magnetic field. From the first order and second order quadrupole perturbed NMR spectrum a quadrupole coupling frequency nu_Q = 222(1.5) kHz is obtained. T_1T = 1090(50) sK and Knight shift K_c = 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 nu_Q, T_1T, and K_c with the corresponding values obtained by LDA calculations shows an excellent agreement for all three quantities.

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