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Collective transport of charges in charge density wave systems based on traveling soliton lattices

A. Rojo-Bravo, V. L. R. Jacques, and D. Le Bolloc’h

  Phys. Rev. B 94, 201120(R) (2016)

    Coherent x-ray diffraction shows that collective transport of charges observed in CDW materials could be due to a soliton lattice in motion.

 

 

 

 

 

 

Laser-Induced Charge-Density-Wave Transient Depinning in Chromium

V. L. R. Jacques, C. Laulhé, N. Moisan, S. Ravy, and D. Le Bolloc’h

Phys. Rev. Lett. 117, 156401 (2016)  

 

When an ultrafast laser pulse hits chromium, the CDW can be depinned from the host lattice during few tens of nanoseconds. A new way to get sliding CDW and sliding SDW ?  

 

 

 

Effect of dimensionality on sliding charge density waves : The quasi-two-dimensional TbTe3 system probed by coherent x-ray diffraction

D. Le Bolloc’h, A.A. Sinchenko, V.L.R. Jacques, L. Ortega, J.E. Lorenzo, G. Chahine, P. Lejay and P. Monceau

Physica B 460 (2015) 96–99

Phys. Rev. B 93, 165124

    When a dc external current is applied to a quasi-2D CDW compound like TbTe3, the CDW displays a sudden change of his topology. The depinning process of the CDW under current is viewed as a shear process (see the blue wave fronts in the figure) .

 

 

 

 

 

  Charge- and spin-density waves observed through their spatial fluctuations by coherent and simultaneous x-ray diffraction

V. L. R. Jacques, E. Pinsolle, S. Ravy, G. Abramovici and D. Le Bolloc’h

  Physical Review B 89, 245127 (2014)

    By using a coherent x-ray beam and simultaneous diffraction, a comparison between two coexisting phases can be observed. This is the case of chromium where the SDW displays a long range order despite a short range CDW. An explanation based on surface nesting is proposed.

 

 

 

 

 

  Estimation of coherence properties of an undulator-generated x-ray beam from near-field and far-field slit diffraction visibilities

V. L. R. Jacques, D. Le Bolloc’h, E. Pinsolle, F.-E. Picca and S. Ravy

  Physical Review B 86, 144117 (2012)

    Precise measurements of contrast of fringes due to the diffraction a micrometer slit by a coherent x-ray beam, from the Fresnel to the Fraunhofer regime, allows us to determine the degree of coherence of the beam.

 

 

 

  Creep, Flow, and Phase Slippage Regimes : An Extensive View of the Sliding Charge-Density Wave Revealed by Coherent X-ray Diffraction

E. Pinsolle, N. Kirova, V. L.R. Jacques, A.A. Sinchenko and D. Le Bolloc’h

  Phys. Rev. Lett. 109, 256402 (2012)

  Physica B 407, 1848-1851 (2012)

  When a dc external current is applied to a quasi-1D CDW compound, the CDW may slide through the atomic lattice, creating a new current in the sample. By using coherent diffraction, we observe here the precise behavior of the CDW : For small currents, the CDW strongly disorders leading to speckles. Above the threshold current, in the sliding state, the CDW reorders by motion : speckles disappear.

 

 

 

 

  Coherent diffraction through the fractional Fourier transform

D. Le Bolloc’h et J.F. Sadoc

  Eur. Phys. J. B 81, 481 (2011)

  The use of the Fractional Fourier Transform is well suited to treat the propagation of a coherent beam from the Fresnel to the Fraunhofer regime. This technique is particularly efficient when dealing with the diffraction of two successive slits.

 

 

 

 

Etude du coeur d’une dislocation de volume par diffraction cohérente de rayons X

V.L.R. Jacques, S. Ravy, D. Le Bolloc’h, E. Pinsolle, M. Sauvage-Simkin, and F. Livet   Phys. Rev. Lett. 106, 065502 (2011)

 

  Etude du coeur d’une dislocation de volume par diffraction cohérente de rayons X

Brève de l’INP (Juin 2011)

 

Correlations up to the micrometer scale observed by coherent x-ray diffraction

D. Le Bolloc’h, V. L. Jacques, N. Kirova, J. Dumas, S. Ravy, et al.

Phys. Rev. Lett. 100, 096403 (2008)

Plein SUD 2008 (Journal Univ. Orsay)

V. L. R. Jacques, D. Le Bolloc’h, S. Ravy, J. Dumas, C. V. Colin,and C. Mazzoli

Phys. Rev. B. 85, 035113 (2012)

 

 

SrTiO3 displacive transition revisited by coherent x-ray diffraction

S. Ravy, Le Bolloc’h, R. Currat, et al.

Phys. Rev. Lett. 98, 105501 (2007)

 

 

Charge density wave dislocation as revealed by coherent x-ray diffraction

D. Le Bolloc’h, S. Ravy, J. Dumas et al.

Phys. Rev. Lett. 95, 116401 (2005)