Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 56 for “"Density Waves"”.
-
Conduction noise in sliding charge-density waves
The conduction noise from sliding charge-density waves (CDWs) is studied in NbSe$\sb3$ and K$\sb{0.3}$MoO$\sb3$ (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 …
-
Conduction noise in sliding charge-density waves
The conduction 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 …
-
Investigation of elastic effects of sliding charge-density waves
… associated 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 …
-
An Nmr Test of Mcmillan's Theory of Incommensurate Charge Density Waves
… to test McMillan's 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 …
-
Fluctuation conductivity from charge density waves in pseudo-one-dimensional systems
… conductivity model, which describes a charge-density-wave phenomenon which can lead to enhanced electrical conductivity in pseudo-one-dimensional systems. The experimental facts concerning pseudo-one-dimensional systems which may illustrate aspects of the Fröhlich mechanism are reviewed. The …
-
A NMR test of McMillan's theory of incommensurate charge density waves
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-17T16:02:12Z No. of bitstreams: 1 1981_couturie.pdf: 1565475 bytes, checksum: 903ed887d6da78e22132b287b555a60a (MD5)
-
Effect of strong density gradients on density waves in spiral galaxies
Thesis. 1976. M.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
-
Charge Density Waves and Superconductivity in Rare Earth Compounds from First Principles
… electron-phonon coupling also leads to charge density waves and structural distortions which compete with superconductivity. To better understand this competition, I use first-principles simulations to study rare-earth tritellurides (RTe3) and doped rare-earth trihydrides (RH3), which host …
-
Structure and motion of charge density waves, and NMR study of NbSe3
… author reports Nb93 NMR studies of the charge density wave (COW) conductor, NbSe3 , using aligned, multicrystalline samples, observing the NMR with and without current flow in the crystals. Above 144 K, where no COW's are present, an orientation and field-dependence NMR study is presented. …
-
Exploring strongly interacting gapless states : cuprates, pair density waves, and fluctuating superconductivity
We study the physical property of pair density wave (PDW) and fluctuating PDW, and use it to build an effective theory of the strongly interacting pseudogap phase in cuprate high temperature superconductors. In Chapter 2, we study how Fulde-Ferrell state, the simplest form of PDW, responds to …
-
X-ray scattering studies of charge density waves in cuprate and pnictide superconductors
This Dissertation was approved for publication on 2020-12-17 at 08:47.
-
Studies of charge density waves in reduced dimensions by surface x-ray scattering
The student, Xinyue Fang, accepted the attached license on 2017-10-12 at 23:43.
-
Structure and Motion of Charge Density Waves: An Nmr Study of Niobium-Selenide(3)
… author reports Nb('93) NMR studies of the charge density wave (CDW) conductor, NbSe(,3), using aligned, multicrystalline samples, observing the NMR with and without current flow in the crystals.
-
Imaging and spectroscopy of tissue-like phantoms using photon density waves: Theory and experiments
The determination of the optical properties of turbid biological media is of primary importance in several areas of medicine and biotechnology. In particular, the quantitative determination and spatial localization of the optical scattering and absorbing properties of biological tissue would allow …
-
Transport studies and phenomenological model for sliding charge-density waves in quasi-one-dimensional conductors
… examining the 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$\sb3$, …
-
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 …
-
Quantum Tunneling of Charge-Density Waves in Quasi-One-Dimensional Conductors (Trichalcogenide, Tantalum Trisulfide, Niobium-Triselenide)
The charge-density wave (CDW) dynamics of the linear chain compound orthorhombic TaS(,3) is characterized by extensive measurements of dc conductivity, ac admittance, direct mixing, harmonic mixing, second harmonic generation, and third harmonic generation as functions of dc bias voltage, applied …
-
Spatial Localization and Temporal Analysis of Optical Property Fluctuations by Multiplexed Near -Infrared Photon Density Waves in Turbid Media: In Vitro and in Vivo Studies
Recently much attention has been given to the study of the processes in the human brain that lead to the changing of the optical parameters that characterize the tissue, measured by our frequency-domain instrumentation. These processes have been divided into two main categories with different …
-
Spatial localization and temporal analysis of optical property fluctuations by multiplexed near-infrared photon density waves in turbid media: In vitro and in vivo studies
In recent years the application of near infrared non-invasive methods for medical diagnostics and clinical studies has grown rapidly. The ease of use, low cost and portability of these methods is a clear advantage over other techniques such as MRI. The limitations in detection of optical property …
-
Light scattering from tantalum diselenide
… a 120 K phase transition, incommensurate charge density waves appear which introduce .additional structure into the Raman spectra. The charge density waves become commensurate below a 110 K phase transition, with a consequent tripling of the size of the unit cell. Several Raman-active modes are …
Page 1 of 3