B.R. Sekhar

Half metallicity in Pr0.75Sr0.25MnO3 : A first principle study

Abstract In this communication we present a first principle study of Pr1−xSrxMnO3 with x = 0.25 . While the parent compounds of this system are antiferromagnetic insulators with different structural and magnetic ground states, the x = 0.25 is in the colossal magnetoresistance regime of the Pr1−xSrxMnO3 phase diagram [C. Martin, A. Maignan, M. Hervieu, B. Raveau, Phys. Rev. B 60 (1999) 12191]. Our band structure calculations for the end-point compounds matches well with the existing theoretical and experimental 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, our calculations show that the Pr0.75Sr0.25MnO3 has a half-metallic character with a huge band gap of 2.8xa0eV in the minority band. We believe this result would fuel further interest in some of these special compositions of colossal magnetoresistive manganites as they could be potential candidates for spintronic devices. We discuss the half-metallicity of the Pr0.75Sr0.25MnO3xa0in the light of changes in the orbital hybridization as a result of Sr doping in PrMnO3. Further, we highlight the importance of half-metallicity for a consolidated understanding of colossal magnetoresistance effect.

Near Fermi level electronic structure of Pr 1 − x Sr x Mn O 3 : Photoemission study

In this study, we report the observation of a pseudogap associated with the insulator-metal transition in compositions of

Pseudogap behavior of phase-separatedSm1−xCaxMnO3: A comparative photoemission study with double exchange

{mathrm{Pr}}_{1ensuremath{-}x}{mathrm{Sr}}_{x}mathrm{Mn}{mathrm{O}}_{3}

Electronic structure of single crystal and highly oriented pyrolytic graphite from ARPES and KRIPES

system with no charge ordering. Our valence-band photoemission study shows that the observed shifts in the near Fermi level density of states are abrupt at the Curie transition and occur over an energy scale of

Electronic structure of the electron-doped Ca0.86Pr0.14MnO3

ensuremath{sim}1phantom{rule{0.3em}{0ex}}mathrm{eV}

Resonant photoemission spectroscopy studies of the magnetic phase transitions in

, strongly suggesting that the charge-ordering gap observed earlier in other manganites and the pseudogap observed here may indeed have the same origin. These results could be understood within the framework of models based on electronic phase separation where it has been shown that the pseudogap is a generic feature of the mixed-phase compositions. Also, our band-structure calculations on

Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr0.5Sr0.5MnO3

{mathrm{Pr}}_{0.75}{mathrm{Sr}}_{0.25}mathrm{Mn}{mathrm{O}}_{3}

Resonant photoemission spectroscopy studies of the magnetic phase transitions in Pr0.5Sr0.5MnO3Pr0.5Sr0.5MnO3

show the possible existence of half metallicity in this system.

Electronic structure of Pr1-xCaxMnO3Pr1-xCaxMnO3 from photoemission and inverse photoemission spectroscopies

Using valence band photoemission we have demonstrated the presence of a pseudogap in the near Fermi level electronic spectrum of some of the mixed phase compositions of Sm

Electronic structure of from photoemission and inverse photoemission spectroscopies

_{1-x}