Impact of the charge density wave state in the electrodynamic response of ZrTe3xSex: Optical evidence for a pseudogap phase

M. Chinotti, J. Ethiraj, C. Mirri, Xiangde Zhu, Lijun Li, C. Petrovic, and L. Degiorgi
Phys. Rev. B 97, 045117 – Published 12 January 2018

Abstract

The emergence of superconductivity upon progressively suppressing the long-range, charge-density-wave (CDW) order characterizes the phase diagram of several materials of interest in the on-going solid-state physics research. Se-doped ZrTe3 compounds provide the most recent, suitable arena in order to investigate the interplay of otherwise competing orders in layeredlike two-dimensional systems. We present an optical study of the CDW state in ZrTe3xSex at selected Se dopings, based on the measurement of the reflectivity from the far-infrared up to the ultraviolet, as a function of temperature. We particularly focus our attention to the redistribution of the spectral weight, which images the impact of the CDW state within the optical conductivity across the phase diagram of the title compounds. The electrodynamic response is consistent with a scenario based on a long-range CDW condensate at low Se doping. Upon increasing the Se content, this then gives way to local, short-range order CDW segments. Our spectral weight analysis reveals the presence of a pseudogap phase, as fingerprint of the CDW precursor effects and thus shaping the charge dynamics of the title compounds in their normal state, preceding the onset of superconductivity.

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  • Received 5 October 2017
  • Revised 10 December 2017

DOI:https://doi.org/10.1103/PhysRevB.97.045117

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. Chinotti1, J. Ethiraj1,*, C. Mirri1, Xiangde Zhu2,3, Lijun Li2,4, C. Petrovic2, and L. Degiorgi1

  • 1Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland
  • 2Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3AnHui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, High Magnetic Field Laboratory, Chinese Academy of Sciences and University of Science and Technology, Hefei 230031, China
  • 4Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China

  • *Present address: National Center for Catalysis Research, Indian Institute of Technology-Madras, Chennai 600036, Tamilnadu, India.

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Issue

Vol. 97, Iss. 4 — 15 January 2018

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