Multiple dimensions of spin-gapless semiconducting states in tetragonal Sr2CuF6

Spin-gapless semiconductors (SGSs), with intrinsic magnetism, 100% spin polarization, and zero-gap band crossing points, have attracted great scientific interest owing to their potential applications in spintronics. In this Letter, using first-principles calculations and symmetry analysis, we demonstrate that the realistic material Sr2CuF6 is a spintronic material with multiple dimensions of spin-gapless semiconducting states. Tetragonal Sr2CuF6 has a zero-dimensional zero-gap nodal point, a one-dimensional zero-gap nodal line, and a twodimensional nearly zero-gap nodal surface in one spin direction. Moreover, it hosts a wide band gap in the other spin direction. Our results extend the SGS members from nodal point SGSs and nodal line SGSs to nodal surface SGSs. Furthermore, we report a SGS candidate in an experimentally realized material exhibiting different dimensions of zero-gap points in momentum space. It is hoped that spintronic materials with multiple dimensions of spin-gapless semiconducting states may have significant applications in new-generation spintronics.

Automated summary

In this Letter, the researchers demonstrate that Sr2CuF6 is a spintronic material with multiple dimensions of spin-gapless semiconducting states using first-principles calculations and symmetry analysis. Their findings extend the range of spin-gapless semiconductors and have significant implications for new-generation spintronics applications.