Pinning of charge density waves in irradiated blue bronzes K 0.30MoO3 and Rb0.30MoO3
نویسندگان
چکیده
2014 Non linear conductivity due to the depinning of charge density waves has been studied in the Peierls distorted state of the blue bronzes K0.30MoO3 and Rb0.30MoO3 as a function of concentration of defects created by electron irradiation. The threshold electric field for the onset of non linearity is found to increase linearly with the defect concentration, as expected for strong pinning centres. The hysteretic properties are also modified by the irradiation centres. J. Physique Lett. 45 (1984) L-729 L-736 15 JUILLET 1984,
منابع مشابه
Ion channeling in the quasi-one dimensional blue bronzes A0.30MoO 3 (A = K, Rb)
2014 We have measured backscattering yields of 1 MeV protons in the quasi-one dimensional blue bronzes Ka0.30MoO3 and Rb0.30MoO3 at temperatures between 50 and 350 K. Large hysteresis and time dependent effects involving long time scales are found. The measurements are discussed in terms of charge density wave domains and domain walls coupled to lattice defects. J. Physique 48 (1987) 1779-1786 ...
متن کاملHysteresis and memory effects in irradiated potassium blue bronzes
2014 Molybdenum blue bronzes exhibit below the Peierls transition time-dependent phenomena. These properties, which are related to the charge density wave instability, are often associated to the presence of defects. In this paper we show that the hysteresis observed during temperature cycling is amplified when defects are introduced by irradiation. We describe two new phenomena observed after ...
متن کاملX - Ray Diffraction from Pinned Charge Density Waves
We present an x-ray study of doped charge density waves systems. When a 2k f-charge density wave is strongly pinned to impurities, an interference effect gives rise to an asymmetry between the intensities of the +2k f and −2k f satellite reflections. Moreover, profile asymmetry of the satellite reflections indicates the existence of Friedel oscillations (FOs) around the defects. We have studied...
متن کاملNanoscale friction: kinetic friction of magnetic flux quanta and charge density waves.
In analogy with the standard macroscopic friction, here we present a comparative study of the friction force felt by moving vortices in superconductors and charge density waves. Using experiments and a model for this data, our observations (1) provide a link between friction at the micro- and macroscopic scales, (2) explain the roundness of the static-kinetic friction transition in terms of the...
متن کاملBoundary effect on CDW: Friedel oscillations, STM image
– We study the effect of open boundary condition on charge density waves (CDW). The electron density oscillates rapidly close to the boundary, and additional non-oscillating terms (∼ ln(r)) appear. The Friedel oscillations survive beyond the CDW coherence length (vF /∆), but their amplitude gets heavily suppressed. The scanning tunneling microscopy image (STM) of CDW shows clear features of the...
متن کامل