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

作     者：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 

作者机构：Center for High Pressure Science and Technology Advanced Research Beijing 100094 China University of Fribourg Department of Physics and Fribourg Center for Nanomaterials Chemin du Musée 3 CH-1700 Fribourg Switzerland Institute of Physics Chinese Academy of Sciences Beijing 100190 China Department of Physics and Engineering Physics Tulane University New Orleans Louisiana 70118 USA Center for Superconducting Physics and Materials National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2018年第98卷第20期

页      面：205111-205111页

核心收录：

基　　金：U.S. Department of Energy, USDOE Office of Experimental Program to Stimulate Competitive Research, EPSCoR NSAF Joint Fund 

主　　题：Band gap Nesting Optical conductivity Phonons Pseudogap Spin density waves Strong interaction Superconductors Magnetization measurements Resistivity measurements 

摘      要：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.