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  • Letter
  • Open Access

Dominant role of charge ordering on high harmonic generation in Pr0.6Ca0.4MnO3

A. Nakano1,*, K. Uchida1, Y. Tomioka2, M. Takaya3, Y. Okimoto4, and K. Tanaka1,5,†

  • *Contact author: nakano.aiko.75n@st.kyoto-u.ac.jp
  • †Contact author: kochan@scphys.kyoto-u.ac.jp
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Phys. Rev. Research 6, L042032 – Published 31 October, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L042032

Abstract

High harmonic generation (HHG) is a typical high-order nonlinear optical phenomenon and can be used to probe electronic structures of solids. Here, we investigate the temperature dependence of HHG from Pr0.6Ca0.4MnO3 in the range of 7–294 K, including the charge ordering (CO) transition and magnetic transition temperatures. The high harmonic (HH) intensity remains almost constant in the high-temperature charge-disordered phase. However, as the temperature is lowered, it starts to increase near the CO transition temperature where an optical gap related to the CO appears. The anomalous gap energy dependence resembles the one recently reported in a Mott insulator. We attribute the suppression of the HH intensity at high temperatures to the destructive interference among HH emissions from thermally activated multiple charge configurations. Our results suggest that HHG is a promising tool for probing the fluctuation of local order in strongly correlated systems.

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Phys. Rev. Research 6, L042032– Published 31 October, 2024
  • Received 14 September 2023
  • Revised 25 May 2024
  • Accepted 31 July 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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