Charge density waves in nanocrystalline thin films of blue bronze K0.3MoO3

Starešinić, Damir; Dominko, Damir; Salamon, Krešimir; Biljaković, Katica; Tomeljak, A.; Schäfer, H.; Huber, Tim; Demšar, Jure; Socol, G.; Ristoscu, Carmen; Siketić, Zdravko; Radović, Iva Bogdanović; Pletikapić, Galja; Svetličić, Vesna; Đekić, Maja; Samic, H.; Marcus, J.

doi:10.1016/j.physb.2012.01.056

Cited by 5 publications

(3 citation statements)

References 14 publications

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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%

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

View full text Add to dashboard Cite

show abstract

“…At the same temperature, the Raman-active CDW amplitude mode appears in fs-TRS [3,5]. The films with lower resistance and a more pronounced anomaly at 150 K also had better texture, the grains preferably ordered in orthogonal directions, as observed by atomic force microscopy (AFM) [4,5].…”

Section: Introductionmentioning

confidence: 91%

“…Standard characterization techniques showed that our films are composed of nanocrystalline grains [3][4][5], while the presence of the CDW in grains below 150 K was unambiguously demonstrated by the observation of CDW amplitude mode in femto-second time resolved spectroscopy (fs-TRS) [3]. In contrast to this, initial transport measurements showed no evidence of the sharp Peierls transition (characteristics of the nominally pure bulk samples) in the temperature dependence of the resistance R(T) of the films, and the data could be fit to a one-dimensional (1d) variable range hopping (VRH) dependence [3].…”

Section: Introductionmentioning

confidence: 99%