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Showing 1 to 20 of 67 for “"CDW"”.
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Elucidation of Charge Density Wave Stability and Defect Interactions in the Highly-Ordered Structural Transition Metal Dichalcogenide System 1T-TaS2
… has a rich and complex charge density wave (CDW) phase character that has been broadly studied. CDWs are a highly correlated state between electron density and lattice distortion, originally predicted to only exist in one dimension. The discovery of CDWs in two-dimensional systems spiked …
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Emergence of charge density wave domain walls above the superconducting dome in TiSe2
… such as antiferromagnetism, charge density wave (CDW), or stripe order. This suggests a fundamental connection between SC and fluctuations in some other order parameter. 1T-TiSe2 is a prototypical CDW material in the transtion-metal dichalcogenide family and was previously shown to exhibit SC when …
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Investigation of elastic effects of sliding charge-density waves
… with the sliding of a charge-density wave (CDW), driven by an electric field, is investigated in o-TaS$\sb3$ by use of a vibrating-reed technique. Experiments performed with a dc sliding CDW find the magnitude of the change in Young's modulus, Y, to be proportional to the square of the CDW …
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Time resolved dynamics of charge density waves in solids : an uncorrelated and a correlated case
Charge density wave (CDW) is a periodic charge modulation in a metal, induced by electron-phonon or electron-electron interaction, which breaks the translational symmetry of the underlying electron gas. The charge density wave order is ubiquitous among condensed matter systems, and its equilibrium …
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Inelastic Light Scattering Studies of Quantum Phase Transitions in Copper Titanium Diselenium and Multiferroic Terbium Manganese Trioxygen
… and pressure on the charge-density-wave (CDW) order in this system. All these parameters---temperature, pressure and Cu-intercalation---suppress the CDW state in TiSe2. Our Raman measurements on CuxTiSe2 show that the x-dependent mode softening exhibits identical scaling behavior to …
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Effects of doping on the electronic properties of niobium triselenide
… and doped samples of the Charge Density Wave (CDW) material NbSe3 are reported. The magnetic studies show that both magnetic(V) and nonmagnetic(Ta) impurities may be introduced into NbSe3; a sensitive electron microscopy technique for measuring the impurity concentration is described. Magnetic …
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Low-dimensional purple and blue bronzes: Crystal growth, characterization and optical properties
… bronzes are a family of charge-density-wave (CDW) conductors with distinctive properties originating from their low-dimensional crystal structure and associated Fermi surface instabilities. Single crystals of potassium blue and purple bronzes and sodium purple bronze have been synthesized …
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Raman Scattering From the Superconductor Niobium-Diselenide
… into an incommensurate charge density wave (CDW) state. The Raman spectrum shows amplitude modes of A and E symmetry near 40 cm('-1) induced by the CDW. At 7 K this material becomes superconducting, and at 2 K we observe additional Raman peaks near 20 cm('-1), one each of A and E symmetry. …
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An Nmr Test of Mcmillan's Theory of Incommensurate Charge Density Waves
… proposal regarding charge density waves (CDW). We compare the temperature dependence of the NMR lineshape from 4.2 K to 130 K with predictions based on McMillan's theory, utilizing the recent x-ray diffraction results of Fleming, Moncton, McWhan, and DiSalvo. We employ a theory by Suits to …
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Transport studies and phenomenological model for sliding charge-density waves in quasi-one-dimensional conductors
… dynamics of one-dimensional charge-density wave (CDW) condensates are reported. Results using rf and dc, linear and nonlinear electrical transport techniques have been obtained at temperatures below the CDW transition in the quasi-one-dimensional materials o-TaS$\sb3$, K$\sb{0.03}$MoO$\sb3$, …
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The influence of topography on ice-ocean interactions in coastal Antarctica
… an inflow of warmer Circumpolar Deep Water (CDW) in a narrow, prograde trough. We find that the trough organizes mesoscale, cyclonic eddies in the dense outflow into a chain pattern. These cyclones then, as an efficient group, entrain filaments of CDW towards the coast. In Chapter 3, we use …
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The influence of topography on ice-ocean interactions in coastal Antarctica
… an inflow of warmer Circumpolar Deep Water (CDW) in a narrow, prograde trough. We find that the trough organizes mesoscale, cyclonic eddies in the dense outflow into a chain pattern. These cyclones then, as an efficient group, entrain filaments of CDW towards the coast. In Chapter 3, we use …
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Western South Atlantic holocene and glacial deepwater hydrography derived from benthic foraminiferal Cd/Ca and stable carbon isotope data
… Atlantic in this region. Circumpolar deep water (CDW) fills the depths below AAIW and above and below northern source waters. A depth transect of cores from 1567-3909 m water depth in the western South Atlantic are ideally located to monitor inter-ocean exchange of deep water, and variations in …
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Western South Atlantic holocene and glacial deepwater hydrography derived from benthic foraminiferal Cd/Ca and stable carbon isotope data
… Atlantic in this region. Circumpolar deep water (CDW) fills the depths below AAIW and above and below northern source waters. A depth transect of cores from 1567-3909 m water depth in the western South Atlantic are ideally located to monitor inter-ocean exchange of deep water, and variations in …
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Quantum critical matter: Casimir pairing, emergent orders and topological defects
… study of incommensurate charge density wave (CDW) in cuprates. Proceeding with a combined analysis of recent experimental data on the CDW, we find the amplitude and the spatial pattern of the CDW. From nuclear magnetic resonance data we extract the s, s' and d-wave amplitudes of the CDW and …
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A nanoscale probe of the quasiparticle band structure for two dimensional electron systems
… the spectroscopic study of charge density wave (CDW) order in the dichalcogenide 2H-NbSe2 - a model system for understanding the interplay of coexisting CDW and superconducting phases. We detail the observation of a previously unknown unidirectional (stripe) CDW smoothly interfacing with the …
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An X-ray study of charge-density-wave pinning and a measurement of the thermal conductivity in blue bronze
Two different aspects of the charge-density-wave (CDW) state were studied in the quasi-onedimensional metal blue bronze (Ko.3oMo03). In the primary experiment reported in this thesis, pinning of the CDW phase by lattice imperfections was examined. Pinning determines most of the dynamics of CDW …
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Ladungstransport indimensionsreduzierten Festkörpern
… diskutiert. Ladungsdichtewellen-Systeme (CDW) zeigen ein charakteristisches Rauschspektrum: Oberhalb einer Schwellenspannung entsteht ein Breitband- und Schmalband-Rauschen im Signal des CDW-Stroms. In dieser Arbeit wird gezeigt, dass der CDW-Strom sich aus Einzelsignalen zusammensetzt. …
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Biosynthesis and characterisation of polyhydroxyalkanoate biopolymers and their oligomers for circular economy
… the most PHA yield with high purity (29% CDW and 40% CDW respectively). While cultures with [text redacted] had the highest yield (32-68% CDW), characterisation results showed this was due to high contamination from the [text redacted] starting material. Electrospray ionisation mass …
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Conduction noise in sliding charge-density waves
… noise from sliding charge-density waves (CDWs) is studied in NbSe3 and Ko.3Mo03 (blue bronze). A statistical analysis of the fluctuations in the noise is presented: the probability distributions of the fluctuating spectral components, the power spectra of these fluctuations (i.e. the …
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