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We present magnetization, specific heat, resistivity, and Hall effectmeasurements on the cubic B20 phase of MnGe and CoGe and compare tomeasurements of isostructural FeGe and electronic structure calculations. InMnGe, we observe a transition to a magnetic state at $T_c=275$ K as identifiedby a sharp peak in the ac magnetic susceptibility, as well as second phasetransition at lower temperature that becomes apparent only at finite magneticfield. We discover two phase transitions in the specific heat at temperaturesmuch below the Curie temperature one of which we associate with changes to themagnetic structure. A magnetic field reduces the temperature of this transitionwhich corresponds closely to the sharp peak observed in the ac susceptibilityat fields above 5 kOe. The second of these transitions is not affected by theapplication of field and has no signature in the magnetic properties or ourcrystal structure parameters. Transport measurements indicate that MnGe ismetal with a negative magnetoresistance similar to that seen in isostructuralFeGe and MnSi. Hall effect measurements reveal a carrier concentration of about0.5 carriers per formula unit also similar to that found in FeGe and MnSi. CoGeis shown to be a low carrier density metal with a very small, nearlytemperature independent diamagnetic susceptibility.

Magnetic, thermodynamic, and electrical transport properties of the noncentrosymmetric B20 germanides MnGe and CoGe