Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005njph....7..112w&link_type=abstract
New Journal of Physics, Volume 7, Issue 1, pp. 112 (2005).
Physics
2
Scientific paper
We report a systematic angle-resolved photoemission study in Ca2-xSrxRuO4 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 t2g orbitals is observed to be similar for all Sr levels, the low-energy quasi-particle (QP) weight changes significantly with x. At xc = 0.5, all the three t2g bands, γ (dxy), α, β (mixing of dyz and dzx) 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 xc = 0.5. There is a mild change on the γ FS, which changes to hole-like in Ca1.5Sr0.5RuO4 from electron-like in Sr2RuO4. 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.
Ding Hong
Wang Shancai
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