Abstract
X-ray photoelectron spectroscopy (XPS), ultraviolet photoelectron spectroscopy (UPS) and X-ray diffraction (XRD) techniques along with calculations of tight-binding linear muffin tin orbitals within the atomic sphere approximation (TB-LMTO-ASA) have been used for studying the metal to insulator transition (MIT) in the series Sr2Ru1−xIrxO4. Rietveld analysis of the XRD data indicated that the samples of x=0 to 0.4 are of I4/mmm space group and x=0.6 and 1.0 are of I41/acd space group. A drastic increase of Ru (Ir)–O1 bond length is observed between x=0.4 and 0.6. UPS data showed finite density of states (DOS) at EF for the samples of x=0.0 to 0.4, whereas no DOS at EF was observed for x=0.6 and 1.0 samples, indicating an MIT between x=0.4 and 0.6. On the contrary, linear muffin tin orbitals (LMTO) calculations show a finite DOS at EF for Sr2IrO4 (x=1.0) with a gap of 1.2eV in the DOS which starts 0.3 above EF. A large spectral weight transfer is seen in UPS conduction bands. These results indicate that the MIT observed in the Sr2Ru1−xIrxO4 series is a combined effect of structure and electron correlation effects.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
