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Showing 1 to 20 of 69 for “"coherence length"”.
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Resolution and Coherence Length at a Pulsed Neutron Reflectometer
Made available in DSpace on 2017-07-06T18:55:28Z (GMT). No. of bitstreams: 3 Munter_Alan_E_MS.pdf: 40474809 bytes, checksum: f2e28c39fc5abcce0b18692a47c9824b (MD5) Munter_Alan_E_MS_ABS.pdf: 1029800 bytes, checksum: e2d468ba1ac6fcf8ef50b822d99e2b5f (MD5) license.txt: 4813 bytes, checksum: …
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[mu]SR measurement of the magnetic penetration depth and coherence length in the high-T superconductor YBa₂Cu₃O₆ 95
… where L is the intervortex spacing and e is the coherence length. The anisotropy of A leads to variation in the measured field inhomogeneity as a function of the angle between the applied field and e axis of the crystal. Measurements in 100 G are consistent with an anisotropy of five. If the …
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Energy efficient multiple antenna communication
… the capacity and analyze its dependence on coherence length, number of antennas and receive signal-to-noise ratio (SNR) per degree of freedom. We establish conditions on the coherence length and number of antennas for the non-coherent channel to have a "near coherent" performance in the …
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An X-ray study of charge-density-wave pinning and a measurement of the thermal conductivity in blue bronze
… CDW systems and can be characterized by a phase coherence length L. Pinning sites were introduced into blue bronze by electron irradiation, then the anisotropy of L and its dependence on pinning site density npin were determined by high-resolution X-ray diffraction. The main results are that the …
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Thermal Conductivity of Tl(2)Ba(2)CuO(6+delta) and Fluctuation Diamagnetism of YBa(2)Cu(3)O(6+x)
… c}$/m$\sb{\rm ab}$)$\sp{1/2}$ and the in-plane coherence length increase by a factor of two as the transition temperature is lowered from 92 K to 70 K, with little change in the c-axis coherence length.
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Non-equilibrium Green's function study of transport in disordered double-layer graphene systems
… that spread throughout the top layer past the coherence length have a reduced effect compared to the ideal case. However, vacancies concentrated near the metal contacts within the coherence length significantly alter the interlayer superfluid transport properties.
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Rotation measures in galaxy clusters from background and embedded sources: estimating the cluster magnetic fields
… observed RMs. We applying a density dependent RM coherence length to our models and find that the magnetic field estimates are improved over models with a constant RM coherence length. We also suggest that a magnetic field model only need be characterized by a coherence length, the central …
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The superconducting penetration depth in thin films of lead
… to know the value of the electromagnetic coherence length as a function of temperature. To this end and to compare our experimental results with theory, we calculated the coherence length and the superconducting conductivity at finite temperatures by using the strong-coupling theory of …
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Development of a portable low-cost digital shearography system
… special properties of lasers, namely their high coherence length and monochromatic light, to detect flaws such as cracks, debonds and delaminations in materials.
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Current flow in inhomogeneous superconductors
… ~('f), varies quickly or slowly compared to a coherence length, ~ (T), to see how well such solutions conserve charge c flux. These solutions are then used to compute the linear current response of a superconductor in these two limits. Scatter'ing is included using the Mattis-Bardeen scattering …
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Fiber Optic Pressure Sensor Fabrication Using MEMS Technology
… split into two channels. One channel with longer coherence length can test the effective interference generated by the FP cavity, while the other channel with shorter coherence length can get signal proportional only to the source power, fiber attenuation, and other optical losses. The ratio of …
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Investigations of Crossed Andreev Reflection in Hybrid Superconductor-Ferromagnet Structures
… at a distance less than the superconducting coherence length. This thesis searches for signatures of this process, called crossed Andreev reflection (CAR), in three device geometries. The first devices studied are lateral spin valves. In these structures, when electrons with energies less …
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Josephson coupling and proximity effects through helimagnetic rare earth interfaces
… reported below but still below the thermal coherence length implying that the transport processes are diffusive. The decay length of the critical current (Ic) in the helimagnetic state is over 100 nm and consistent with the non-magnetic coherence length in the dirty limit. The external …
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Resistivity and paraconductivity in the high temperature superconductor YBa2̳Cu3̳O7̳-̳y̳
… samples. The value of the BCS superconducting-coherence length in the clean limit, ~ 0 {0) = 13.4 ± 4.2A, has been extracted from the analysis. The Ginzburg criterion have been used to estimate Hc 2 ~ 500 kG. We have measured the ab plane resistivity of a twinnedsingle crystal of YBa2cu3o7_y· …
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Modeling superconductors using surface impedance techniques
… frequency and material parameters (such as the coherence length and the normal state conductivity). The surface impedance calculations apply the Mattis Bardeen and Zimmermann formulations of conductivity for superconductors to classical transmission line theory. When the tool is used with the …
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Search for the onset of color transparency through neutral rho meson electroproduction on nuclei
… was measured as a function of Q2 and Coherence Length (l c), and was found to be independent of the (l c on the range scanned in the experiment. The increase in Nuclear Transparency observed with an increase in Q2 signify the onset of the Color Transparency effect.</p>
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Investigations of nonlocal transport and current noise in mesoscopic normal metal-superconductor hybrid structures
… pairs can be split without losing wavefunction coherence. In Cooper pair-splitter devices the electrodes (or quantum dots) are coupled to a superconductor with a separation of less than or equal to the superconducting coherence length. At such distances coherent nonlocal subgap transport takes …
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MICA optical : a low-cost, educational Michelson interferometer
… experiments include the measurement of light wavelengths, coherence length, as well as thermal expansion coefficients with the addition of a few simple parts. The initial benchmarking, the design process, and the final manufacturing methods for this module are discussed. The result of this project …
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Electron-phonon interactions in double layer graphene superfluids
… scattering has a strong dependence on the device coherence length, the maximum distance that individual electrons or holes may travel into the gapped superfluid region.
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A study of vortex lattices and pulsar glitches
… comparable to the penetration depth λ and the coherence length ξ of a superconductor. We learn about the types of phase transitions that the vortex configurations undergo and the stability of the resulting states. Our aim is to investigate how vortex configurations reorganize after phase …
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