J. C. Lasjaunias

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Previous Cp experiment [1] gave first evidence for 1D quantum confinement of vibrational modes in SWNT, crossing over to 3-D behaviour at very low T where tubetube interactions become important. These measurements were limited to 2 K. The data did not follow a linear extrapolation to T = 0, which provided a strong motivation to extend the measurement to mK(More)
– Measurements of the magnetic susceptibility and its anisotropy in the quasi-one-dimensional system o-TaS3 in its low-T charge density wave (CDW) ground state are reported. Both sets of data reveal below 40 K an extra paramagnetic contribution obeying a power-law temperature dependence χ(T)=AT −0.7. The fact that the extra term measured previously in(More)
Measurements of thermopower S(a)(T) along the highly conducting a axis and specific heat of the Bechgaard salts (TMTSF)(2)ClO(4) for various cooling rates through the anion ordering temperature T(a) = 24 K were carried out. Sign reversal in S(a)(T) is found below T(a) and it decreases with increasing cooling rate, which is attributed to the change of a(More)
Nonexponential relaxation is found in extremely diverse physical systems such as structural glasses, spin glasses, polymers and random systems in general, all of which can be classified as complex [1]. More recently, pinned density-wave (DW) systems with either charge or spin modulation have been added to this list [2]. Although a wide variety of mechanisms(More)
Equilibrium heat relaxation experiments provide evidence that the ground state of the commensurate spin-density-wave compound (TMTTF)2Br after the application of a sufficient magnetic field is different from the conventional ground state. The experiments are interpreted on the basis of the local model of strong pinning as the deconfinement of(More)
We show that the specific heat of incommensurately modulated crystals with broken translational periodicity presents similar features at low temperatures to those of amorphous and glass materials. Here we demonstrate that the excess to the constant C_{p}(T)/T^{3} law (or Debye limit) is made up of an upturn below 1 K and of a broad bump at T≈10 K that(More)
We present the first low-temperature thermodynamic investigation of the controlled physisorption of He4 gas in carbon single-wall nanotube (SWNT) samples. The vibrational specific heat measured between 100 mK and 6 K demonstrates an extreme sensitivity to outgassing conditions. For bundles with a few number of nanotubes the extra contribution to the(More)
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