# Revealing the pseudogap in ${\mathrm{Sr}}_{3}{({\mathrm{Ru}}_{0.985}{\mathrm{Fe}}_{0.015})}_{2}{\mathrm{O}}_{7}$ by optical spectroscopy

• Ban, W. J. Center for High Pressure Science and Technology Advanced Research, Beijing, China
• Xu, Bing University of Fribourg, Department of Physics and Fribourg Center for Nanomaterials, Fribourg, Switzerland
• Li, W. H. Institute of Physics, Chinese Academy of Sciences, Beijing, China
06.11.2018
Published in:
• Physical Review B. - 2018, vol. 98, no. 20, p. 205111
English 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 600 cm−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.
Faculty
Faculté des sciences et de médecine
Department
Département de Physique
Language
• English
Classification
Physics