Evolution of electronic structure in Ca 2-xSr xRuO 4 observed by photoemission

5Citations
Citations of this article
16Readers
Mendeley users who have this article in their library.

This article is free to access.

Abstract

We report a systematic angle-resolved photoemission study in Ca 2-xSr xRuO 4 for a wide range of Sr concentrations (0.3 ≤ x ≤ 2.0), with a focus on the Fermi surface (FS) topology at x = 0.5, which is believed to be a quantum critical point. While the dispersion of the valence bands formed by the t 2g orbitals is observed to be similar for all Sr levels, the low-energy quasiparticle (QP) weight changes significantly with x. At x c = 0.5, all the three t 2g bands, γ (d xy), α, β (mixing of d yz and d zx) remain metallic, with no major electron transfer among them. This is in contrast to the scenario of orbital-selective Mott transition proposed to explain the critical behaviour at x c = 0.5. There is a mild change on the γ FS, which changes to hole-like in Ca 1.5Sr 0.5RuO 4 from electron-like in Sr 2RuO 4. The doping dependence of the QP weight has a general trend of decreasing with decreasing x, but there is a local maximum at x = 0.5. This suggests that the QP weight is controlled by the competition between Mott localization and disorder-driven localization. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Cite

CITATION STYLE

APA

Wang, S., & Ding, H. (2005). Evolution of electronic structure in Ca 2-xSr xRuO 4 observed by photoemission. New Journal of Physics, 7. https://doi.org/10.1088/1367-2630/7/1/112

Register to see more suggestions

Mendeley helps you to discover research relevant for your work.

Already have an account?

Save time finding and organizing research with Mendeley

Sign up for free