Revealing the pseudogap in Sr3(Ru0.985Fe0.015)2 O7 by optical spectroscopy

W. J. Ban, B. Xu, W. H. Li, Y. Wang, J. J. Ge, P. G. Li, R. Yang, Y. M. Dai, Z. Q. Mao, H. Xiao

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We report resistivity, magnetization, and optical spectroscopy study on single-crystal sample of Sr3(Ru0.985Fe0.015)2O7. An upturn is observed in resistivity at about 30 K. Below 30 K, the dip in resistivity R(ω), the suppression in scattering rate 1/τ(ω), the peaklike feature in optical conductivity σ1(ω), and the remainder of spectral weight all suggest the formation of a pseudogap. In addition, one phonon peak at about 600cm-1 is distinguished at all temperatures, which has asymmetric line shape. Such asymmetric line shape can be fit by a Fano function, and the resulting Fano factor 1/q2 and linewidth γ show significant increases below 30 K, giving further evidence for the formation of a pseudogap, which might originate from the partial k-space gap opening due to density wave instability.

Original languageEnglish (US)
Article number205111
JournalPhysical Review B
Issue number20
StatePublished - Nov 6 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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