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

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

doi:10.1103/physrevb.98.205111

Title: Revealing the pseudogap in Sr₃(Ru_0.985Fe_0.015)₂O₇ by optical spectroscopy

Journal Article · 05 November 2018 · Physical Review B

DOI: https://doi.org/10.1103/physrevb.98.205111 · OSTI ID:1611796

Ban, W. J. ^[1]; Xu, B. ^[2]; Li, W. H. ^[3]; Wang, Y. ^[4]; Ge, J. J. ^[4]; Li, P. G. ^[4]; Yang, R. ^[3]; Dai, Y. M. ^[5]; Mao, Z. Q. ^[4]; Xiao, Hong ^[6]

Center for High Pressure Science and Technology Advanced Research, Beijing (China); DOE/OSTI
University of Fribourg (Switzerland)
Chinese Academy of Sciences, Beijing (China)
Tulane University, New Orleans, LA (United States)
Nanjing University (China)
Center for High Pressure Science and Technology Advanced Research, Beijing (China)

We report resistivity, magnetization, and optical spectroscopy study on single-crystal sample of Sr₃(Ru_0.985Fe_0.015)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.

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Research Organization:: Louisiana State Univ., Baton Rouge, LA (United States); Louisiana State University, Baton Rouge, LA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0012432

OSTI ID:: 1611796

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 20 Vol. 98; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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

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Title: Revealing the pseudogap in Sr₃(Ru_0.985Fe_0.015)₂O₇ by optical spectroscopy