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We report on the synthesis and measurements of the temperature dependence ofresistivity, R(T), the penetration depth, l(T), and upper critical magneticfield, Hc2(T), for polycrystalline samples of dodecaboride ZrB12 and diborideMgB2. We conclude that ZrB12 as well as MgB2 behave like simple metals in thenormal state with usual Bloch-Gruneisen temperature dependence of resistivityand with rather low resistive Debye temperature, TR=280 K, for ZrB12 (ascompared to MgB2 with TR=900 K). The R(T) and l(T) dependencies of ZrB12 reveala superconducting transition at Tc=6.0 K. Although a clear exponentiall(T)dependence in MgB2 thin films and ceramic pellets was observed at lowtemperatures, this dependence was almost linear for ZrB12 below Tc/2. Thesefeatures indicate s-wave pairing state in MgB2, whereas a d-wave pairing stateis possible in ZrB12. A fit to the data gives a reduced energy gap2D(0)/kTc=1.6 for MgB2 films and pellets, in good agreement with published datafor 3D \pi - sheets of the Fermi surface. Contrary to conventional theories wefound a linear temperature dependence of Hc2(T) for ZrB12 (Hc2(0)=0.15 T).Comment: 8 pages, 10 figures, submitted to JET

Electron transport, penetration depth, and the upper critical magnetic field in ZrB12 and MgB2