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In this communication we present a first principle study ofPr$_{1-x}$Sr$_{x}$MnO$_3$ with $x = 0.25$. While the parent compounds of thissystem are antiferromagnetic insulators with different structural and magneticground states, the $x = 0.25$ is in the colossal magnetoresistance regime ofthe Pr$_{1-x}$Sr$_{x}$MnO$_3$ phase diagram [C. Martin, A. Maignan, M. Hervieu,B. Raveau, Phys. Rev. B 60 (1999) 12191]. Our band structure calculations forthe end-point compounds matches well with the existing theoretical andexperimental results [C. Martin, A. Maignan, M. Hervieu, B. Raveau, Phys. Rev.B 60 (1999) 12191; Rune Sondena, P. Ravindran, Svein Stolen, Tor Grande,Michael Hanfland, Phys. Rev. B 74 (2006) 144102]. Interestingly, ourcalculations show that the Pr$_{0.75}$Sr$_{0.25}$MnO$_3$ has a half-metalliccharacter with a huge band gap of 2.8 eV in the minority band. We believe thisresult would fuel further interest in some of these special compositions ofcolossal magnetoresistive manganites as they could be potential candidates forspintronic devices. We discuss the half-metallicity of thePr$_{0.75}$Sr$_{0.25}$MnO$_3$ in the light of changes in the orbitalhybridization as a result of Sr doping in PrMnO$_3$. Further, we highlight theimportance of half-metallicity for a consolidated understanding of colossalmagnetoresistance effect.

Half Metallicity in Pr$_{0.75}$Sr$_{0.25}$MnO$_3$: A first Principle study