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Search Results: 1 - 10 of 200625 matches for " P. Monceau "
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Dynamical transport properties of NbSe$_3$ with simultaneous sliding of both charge density waves
A. A. Sinchenko,P. Monceau
Physics , 2013, DOI: 10.1103/PhysRevB.87.045105
Abstract: Measurements of the nonlinear conductivity in NbSe$_3$ when the high-T and the low-T charge-density waves (CDWs) are simultaneously sliding have been performed. It is shown that the threshold electric field, $E_{t1}$, for depinning the high-T CDW increases 4 - 5 times at the temperature at which the low-T CDW is formed, indicating the strong pinning effect resulting from the interaction between both CDWs. Under application of a radio-frequency (rf) field, Shapiro steps are never observed simultaneously for both CDWs. At the electric field less then one for high-T CDW sliding only Sapiro steps for low-T CDW were observed, and at higher field only Shapiro steps for high-T CDW exist.
Sliding charge-density-wave in two-dimensional rare-earth tellurides
A. A. Sinchenko,P. Lejay,P. Monceau
Physics , 2012, DOI: 10.1103/PhysRevB.85.241104
Abstract: Nonlinear transport properties are reported in the layered DyTe$_3$ compound at temperature below the charge-density-wave (CDW) transition, $T_P=302$ K. Conductivity is increasing sharply above the threshold electric field. Under application of a rf field Shapiro steps are clearly observed. These features demonstrate for the first time CDW sliding in two-dimensional compounds.
Ferroelectric Mott-Hubbard phase in organic conductors
S. Brazovskii,P. Monceau,F. Nad
Physics , 2003,
Abstract: We present key issues of related phenomenons of the Ferroelectricity and the Charge Disproportionation in organic metals. In (TMTTF_2X the dielectric susceptibility demonstrates clear cases of the ferroelectric and anti-ferroelectric phase transitions. Both the susceptibility and the conductivity prove independence and occasional coexistence of "structurless" ferroelectric transitions and usual "anionic" ones. Their sequence gives access to physics of three types of solitons emerging upon cooling via several steps of symmetry breaking. The theory invokes a concept of the Combined Mott-Hubbard State which focuses upon weak processes of electronic Umklapp scattering coming from both the build-in nonequivalence of bonds and the spontaneous one of sites. We propose that the charge ordering in its form of the ferroelectricity exists hiddenly even in the Se subfamily (TMTSF)_2X, giving rise to the unexplained yet low frequency optical peak and the enhanced pseudogap.
Charge density wave transport in submicron antidot arrays in NbSe3
Yu. I. Latishev,B. Pannetier,P. Monceau
Physics , 1997,
Abstract: We demonstrate for the first time that a periodic array of submicrometer holes (antidots) can be patterned into thin single NbSe3 crystals. We report on the study of charge density wave (CDW) transport of the network of mesoscopic units between antidots. Size of the elementary unit can be as small as 0.5 micron along the chain axis and (0.2 micron) x (0.3 micron) in cross section. We observe size effects for Ohmic residual resistance and in CDW transport current-voltage characteristics in submicronic networks.
Critical dynamics and domain motion from permittivity of the electronic ferroelectric (TMTTF)2AsF6
S. Brazovskii,P. Monceau,F. Ya. Nad
Physics , 2015, DOI: 10.1016/j.physb.2014.11.044
Abstract: The quasi one-dimensional organic conductor (TMTTF)2AsF6 shows the charge ordering transition at Tc101K to a state of the ferroelectric Mott insulator which is still well conducting. We present and interpret the experimental data on the gigantic dielectric response in the vicinity of TCO, concentrating on the frequency dependence of the inverse $1/\epsilon$ of the complex permittivity $\epsilon=\epsilon^\prime+i\epsilon^{\prime\prime}$. Surprisingly for a ferroelectric, we could closely approach the 2nd order phase transition and to deeply reach the critical dynamics of the polarization. We could analyse the critical slowing-down when approaching Tc from both sides and to extract the anomalous power law for the frequency dependence of the order parameter viscosity. Moreover, below Tc we could extract a sharp absorption feature coming from a motion of domain walls which shows up at a frequency well below the relaxation rate.
Transverse conductivity in the sliding CDW state of NbSe_3
A. A. Sinchenko,P. Monceau,T. Crozes
Physics , 2012, DOI: 10.1103/PhysRevLett.108.046402
Abstract: The dynamical properties of longitudinal and transverse conduction of NbSe$_3$ single-crystals have been simultaneously studied when the current is applied along the b axis (chain direction). In the vicinity of the threshold electric field for CDW sliding, the transverse conduction sharply decreases. When a rf field is applied, voltage Shapiro steps for longitudinal transport are observed as usual, but also current Shapiro steps in the transverse direction. The possible mechanisms of this effect are discussed.
The ferroelectric Mott-Hubbard phase of organic (TMTTF)2X conductors
P. Monceau,F. Ya. Nad,S. Brazovskii
Physics , 2000, DOI: 10.1103/PhysRevLett.86.4080
Abstract: We present experimental evidences for a ferro-electric transition in the family of quasi one- dimensional conductors (TMTTF)2X. We interpret this new transition in the frame of the combined Mott-Hubbard state taking into account the double action of the spontaneous charge disproportionation on the TMTTF molecular stacks and of the X anionic potentials.
Spontaneous breaking of isotropy observed in the electronic transport of rare-earth tritellurides
A. A. Sinchenko,P. D. Grigoriev,P. Lejay,P. Monceau
Physics , 2013, DOI: 10.1103/PhysRevLett.112.036601
Abstract: We show that the isotropic conductivity in the normal state of rare-earth tritelluride RTe_3 compounds is broken by the occurrence of the unidirectional charge density wave (CDW) in the (a,c) plane below the Peierls transition temperature. In contrast with quasi-one-dimensional systems, the resistivity anomaly associated with the CDW transition is strong in the direction perpendicular to the CDW wave vector Q (a-axis) and very weak in the CDW wave vector Q direction (c-axis). We qualitatively explain this result by calculating the electrical conductivity for the electron dispersion with momentum-dependent CDW gap as determined by angle-resolved photoemission spectroscopy (ARPES).
Strong-Pinning Effects in Low-Temperature Creep: Charge-Density Waves in TaS_3
S. V. Zaitsev-Zotov,G. Remenyi,P. Monceau
Physics , 1996, DOI: 10.1103/PhysRevLett.78.1098
Abstract: Nonlinear conduction in the quasi-one dimensional conductor o-TaS_3 has been studied in the low-temperature region down to 30 mK. It was found that at temperatures below a few Kelvins the current-voltage (I-V) characteristics consist of several branches. The temperature evolution of the I-V curve proceeds through sequential freezing-out of the branches. The origin of each branch is attributed to a particular strong pinning impurity type. Similar behavior is expected for other physical systems with collective transport (spin-density waves, Wigner crystals, vortex lattices in type-II superconductors etc.) in the presence of strong pinning centers.
Recent results on energy relaxation in disordered charge and spin density waves
R. Mélin,K. Biljakovic,J. C. Lasjaunias,P. Monceau
Physics , 2005, DOI: 10.1051/jp4:2005131041
Abstract: We briefly review different approaches used recently to describe collective effects in the strong pinning model of disordered charge and spin density waves, in connection with the CRTBT very low temperature heat relaxation experiments.
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