Single crystal-like thin films of blue bronze

Dominko, Damir; Starešinić, Damir; Biljaković, Katica; Đekić, Maja; Fetić, Amra Salčinović; Hrvat, K.; Lozančić, Matej; Demšar, Jure; Grigorev, Vladimir; Potočnik, Tjaša Parkelj; Spreitzer, Matjaž

doi:10.1016/j.tsf.2021.138745

Cited by 2 publications

(1 citation statement)

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“…Here we are pursuing THz transmission studies of thin exfoliated flakes, although the small lateral dimensions of sufficiently thin samples (thickness <10 µm) are limited, requiring specialized spectroscopic methods. Here deposited K 0.3 MoO 3 thin films [41,42], which exhibit nearcrystalline AM response, could provide essential experimental results, if their morphological properties maintain the PM response for macroscopic field interaction. The TDGL model can be readily applied to account for the collective modes, and serves as a versatile framework which can be applied to systems with multiple, coupled order parameters and for ultrafast non-equilibrium studies [11,12,43].…”

Section: Discussionmentioning

confidence: 99%

Combined investigation of collective amplitude and phase modes in a quasi-one-dimensional charge-density-wave system over a wide spectral range

Warawa¹,

Nicolas²,

Sobolev³

et al. 2023

Preprint

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We investigate experimentally both the amplitude and phase channels of the collective modes in the quasi-1D charge-density-wave (CDW) system, K0.3MoO3, by combining (i) optical impulsive-Raman pump-probe and (ii) terahertz time-domain spectroscopy (THz-TDS), with high resolution and a detailed analysis of the full complex-valued spectra in both cases. This allows an unequivocal assignment of the observed bands to CDW modes across the THz range up to 9 THz. We revise and extend a time-dependent Ginzburg-Landau model to account for the observed temperature dependence of the modes, where the combination of both amplitude and phase modes allows one to robustly determine the bare-phonon and electron-phonon coupling parameters. While the coupling is indeed strongest for the lowest-energy phonon, dropping sharply for the immediately subsequent phonons, it grows back significantly for the higher-energy phonons, demonstrating their important role in driving the CDW formation. We also include a reassessment of our previous analysis of the lowest-lying phase modes, whereby assuming weaker electronic damping for the phase channel results in a qualitative picture more consistent with quantum-mechanical treatments of the collective modes, with a strongly coupled amplitudon and phason as the lowest modes.

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Section: Discussionmentioning

confidence: 99%