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Yamanouchi, Sachiko; Taguchi, Y.; Tokura, Y.

doi:10.1103/physrevlett.83.5555

Cited by 74 publications

(78 citation statements)

References 17 publications

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“…Pinning effects introduced by disorder that limits the length scale of CO may also provide another mechanism for phason damping. High-voltage resistivity measurements suggest that these effects are non-negligible 29 . Nevertheless, τ φ − ph is more than one order of magnitude slower than the electron-phonon relaxation time, which is estimated to be ~0.4 ps by extrapolating t ∆R R / fast to zero excitation density.…”

Section: Discussionmentioning

confidence: 99%

Phase fluctuations and the absence of topological defects in a photo-excited charge-ordered nickelate

et al. 2012

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The dynamics of an order parameter's amplitude and phase determines the collective behaviour of novel states emerging in complex materials. Time-and momentum-resolved pump-probe spectroscopy, by virtue of measuring material properties at atomic and electronic time scales out of equilibrium, can decouple entangled degrees of freedom by visualizing their corresponding dynamics in the time domain. Here we combine time-resolved femotosecond optical and resonant X-ray diffraction measurements on charge ordered La 1.75 sr 0.25 nio 4 to reveal unforeseen photoinduced phase fluctuations of the charge order parameter. such fluctuations preserve long-range order without creating topological defects, distinct from thermal phase fluctuations near the critical temperature in equilibrium. Importantly, relaxation of the phase fluctuations is found to be an order of magnitude slower than that of the order parameter's amplitude fluctuations, and thus limits charge order recovery. This new aspect of phase fluctuations provides a more holistic view of the phase's importance in ordering phenomena of quantum matter.

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Section: Discussionmentioning

confidence: 99%

Phase fluctuations and the absence of topological defects in a photo-excited charge-ordered nickelate

et al. 2012

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“…give erroneous results as the characteristic correlation length of the ordered/disordered state in CO manganites is quite large 15,16 .…”

Section: +mentioning

confidence: 99%

Current-induced metallic behavior inPr0.5Ca0.5MnO3thin films: Competitio

et al. 2004

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Current-induced metallic behavior in Pr 0.5 Ca 0.5 MnO 3 thin films: competition between Joule heating and nonlinear conduction mechanism. substrates. The effects of current-induced metallic-behavior of the films are investigated as a function of the temperature and the magnetic field. Calculations based on a heat transfer model across the substrate, and our resistivity measurements reveal effects of Joule heating on charge transport over certain ranges of temperatures and magnetic fields. Our results also indicate that a nonlinear conduction, which cannot be explained by homogeneous Joule heating of the film, is observed when the material is less resistive (<10 −2 Ω.cm).The origin of this behavior is explained with a model based on local thermal instabilities associated with phase-separation mechanism and a change in the * prellier@ismra.fr 1 long range charge-ordered state.

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“…Distinct mechanisms to explain these remarkable nonlinear effects have been suggested ranging from melting of charge order in θ-(BEDT-TTF) 2 CsM ′ (SCN) 4 (M ′ = Zn, Co) compounds 11 to dielectric breakdown and depinning and sliding of holes within charge stripes in La 2−x Sr x NiO 4+δ . 10 In the TMET-TTP organic system the electrothermal model originally developed to account for the hot electron dynamics was used to reproduce the measured nonlinear conductivity which featured NDR with no switching.…”

Section: Introductionmentioning

confidence: 99%

Cooperative dynamics in charge-ordered state ofα-(BEDT-TTF)2I3

et al. 2012

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Electric-field-dependent pulse measurements are reported in the charge-ordered state of α-(BEDT-TTF)2I3. At low electric fields up to about 50 V/cm only negligible deviations from Ohmic behavior can be identified with no threshold field. At larger electric fields and up to about 100 V/cm a reproducible negative differential resistance is observed with a significant change in shape of the measured resistivity in time. These changes critically depend whether constant voltage or constant current is applied to the single crystal. At high enough electric fields the resistance displays a dramatic drop down to metallic values and relaxes subsequently in a single-exponential manner to its low-field steady-state value. We argue that such an electric-field induced negative differential resistance and switching to transient states are fingerprints of cooperative domain-wall dynamics inherent to two-dimensional bond-charge density wave with ferroelectric-like nature.

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Dielectric Breakdown of the Insulating Charge-Ordered State inLa2−xSrxNiO

Cited by 74 publications

References 17 publications

Phase fluctuations and the absence of topological defects in a photo-excited charge-ordered nickelate

Phase fluctuations and the absence of topological defects in a photo-excited charge-ordered nickelate

Current-induced metallic behavior inPr0.5Ca0.5MnO3thin films: Competitio

Cooperative dynamics in charge-ordered state ofα-(BEDT-TTF)2I3

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