Optical investigation of the electronic structures ofY2Ru2O7

Ferromagnetic transition in the correlated4dperovskitesSrRu1−xRhYamaura1, Young2, Takayama‐Muromachi3 2004Phys. Rev. B253210View full textAdd to dashboardCite

“…The electrically conducting state of SrRuO 3 is probably dominated by Ru4d electrons and a small amount of O-2p holes, 9,10 and is clearly affected by the ferromagnetic order (T c ∼160 K). 11,12,13,14,15 So far experimental studies on the material reveal strongly correlated features and substantial influences of spin fluctuations through measurements of optical conductivity, 16 far-infrared transmission,…”

Quasiparticle Mass Enhancement and Temperature Dependence of the Electronic Structure of FerromagneticSrRuO3Thin Films

“…Although early angle-integrated photoemission [18] and optical conductivity measurements [25] suggested that electron-electron interactions might be responsible for the large effective masses, later optical [26] and angle-integrated photoemission measurements [27] indicate that electron-electron interactions could be relatively weak. Our observation of an abrupt kink in the β 1 band provides direct evidence that strong electron-boson coupling in SrRuO 3 is a dominant factor in the large observed effective masses.…”

Optical investigations onY2−xBixRu2O7: Electro

“…We estimated the energy position ω p−d of the peak by fitting σ(ω) with a series of the Lorentz oscillators. 10 As shown in Fig. 4(a), ω p−d shows a gradual decrease with increase of x.…”

“…7 The other explanation is based on the fact that Pb or Bi 6p electrons should have very large wavefunctions, which could hybridize with the Ru t 2g wavefunctions. This hybridization could result in large bandwidths of the Ru t 2g bands and a net transfer of charge to the Ru t 2g bands, 8,9,10,11 so the ruthenates could experience a MIT, called the 'filling-controlled MIT'. Hsu et al compared the x-ray photoemission spectroscopy spectra of Pb 2 Ru 2 O 6.5 and Bi 2 Ru 2 O 7 with band-structure calculations and argued that the unoccupied Pb or Bi 6p states should be closely related to their metallic conductivity through mixing with the Ru 4d states via the ligand oxygen 2p states.…”