  Employing $ab$ $intito$ electronic structure calculations, we have
investigated electronic and magnetic properties of the Zr-based quanternary
Heusler alloys: ZrCoVIn, ZrFeVGe, ZrCoFeP, ZrCoCrBe and ZrFeCrZ (Z=In and Ga).
Our $ab$ $intito$ calculation results show that all the alloys are (or nearly)
spin-gapless semiconductors. All the alloys have large band gaps, indicating
the stability of them at room temperature. The Slater-Pauling behaviours of
these alloys are discussed as well. The values of Curie temperature of all the
alloys are estimated. And it is found that the values of the Curie temperature
for all our calculated quanternary Heusler alloys are higher than that of room
temperature.
