  In this letter, we investigate the magnetic properties, electronic
structures, Slater-Pauling behaviours of some quanternary Heusler alloys with
4d and 3d transition metal elements. The energy levels of the minority-spin
electronic band structures for all our calculated alloys are discussed. We have
summaried 21 quanternary Heusler alloys. Our calculations indicate that the
half metals ZrCoCrSi, ZrCoCrIn, ZrCoFeSi, ZrFeVAl, ZrFeVGa and NbFeCrAl have
large spin-flip gaps.
