We report on the results of the Pt-195 NMR measurements for MPt4Ge12 (M =3D Sr, Ba) to clarify the microscopic electronic states at low temperatures. In SrPt4Ge12 and BaPt4Ge12, the isotropic component of the Knight shift, that is, the contribution from the Pt 5s states is smaller than that in LaPt4Ge12. In the superconducting state, 1/T-1 shows a small coherence peak just below T-C, followed by an exponential decrease at low temperatures revealing on energy gap Delta/k(B)T(C) =3D 1.6, which suggests a conventional BCS superconductor. (C) 2009 Elsevier B.V. All rights reserved.
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