Near Fermi level Electronic Structure of PrSrMnO: Photoemission Study
arXiv:0712.3109 · doi:10.1103/PhysRevB.76.195120
Abstract
In this study, we report the observation of a pseudogap associated with the insulator-metal transition in compositions of PrSrMnO 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 transtion and occur over an energy scale of 1 eV, strongly suggesting that the charge-ordering gap observed earlier in other manganites and the pseudogap observed here may indeed have 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 PrSrMnO show the possible existence of half-metallicity in this system.
arXiv comment5 pages, 5 figures
References in corpus (6)
- Theoretical Study of Half-Doped Models for Manganites: Fragility of the CE Phase with Disorder, Two Types of Colossal Magnetoresistances, and Charge-Ordered States for Electron-Doped Materials
- Novel stripe-type charge ordering in the metallic A-type antiferromagnet Pr{0.5}Sr{0.5}MnO{3}
- Pseudogap Formation in Models for Manganites
- Temperature-Dependent Pseudogaps in Colossal Magnetoresistive Oxides
- Chemical potential shift and spectral weight transfer in PrCaMnO revealed by photoemission spectroscopy
- Electronic structure of PrCaMnO near the Fermi level studied by ultraviolet photoelectron and x-ray absorption spectroscopy