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 32 for “"superconducting order parameter"”.
-
Superconducting order parameter domains in Sr2RuO4 probed by Josephson interferometry
There is evidence for degenerate chiral order parameters of px±ipy symmetry in the superconducting ruthenate Sr2RuO4 which can lead to the presence of chiral order parameter domains in the material. We study bi-metallic Josephson junctions made of Sr2RuO4 and a conventional superconductor. Their …
-
Superconducting Order Parameter Domains in Strontium Ruthenate Probed by Josephson Interferometry
There is evidence for degenerate chiral order parameters of px +/- ipy symmetry in the superconducting ruthenate Sr 2RuO4 which can lead to the presence of chiral order parameter domains in the material. We study bi-metallic Josephson junctions made of Sr2RuO4 and a conventional superconductor. …
-
Determining the superconducting order parameter of UPt3 with Josephson junction interferometry
Made available in DSpace on 2010-05-14T20:51:19Z (GMT). No. of bitstreams: 2 Strand_Joel.pdf: 3215583 bytes, checksum: 56bc27939f1df7406b5bd380bfc02090 (MD5) license.txt: 4060 bytes, checksum: 7daff777161209135fcbaaaff684d71b (MD5)
-
Probing the superconducting order parameter of Iron-based superconductors through the Josephson effect
… Josephson effect to probe the symmetry of the superconducting order parameter of Co-doped Ba(FeAs)2 crystals (Ba122). This measurements were carried out to test the validity of the s± model, which predicts the pairing in the multiband Ba122 compounds being mediated by the exchange of spin …
-
Experimental determination of the symmetry of the superconducting pairing state in yttrium barium copper oxide
… measurements of bimetallic Pb-Au-YBCO dc SQUIDs (Superconducting QUantum Interference Devices) and Josephson junctions that provide an important clue to the origin of the pairing mechanism for high temperature superconductivity in the cuprates. By probing the momentum space anisotropy of the phase …
-
Exploring exotic superconducting order in La-based cuprate materials using Josephson interferometry
… especially useful devices for studying exotic superconducting materials, because the transmission of superconductivity through a junction depends on the difference in phase of the superconducting order parameter across the junction. We present the results of two measurements which involve the …
-
Self-Consistent Study of Topological Superconductivity in Two-Dimensional Quasicrystals
… superconductivity (TSC) results in a novel superconducting state characterized by a nonzero topological invariant in the bulk. There is a relation between the bulk and edges or surfaces, which is called the bulk-edge correspondence. The bulk-edge correspondence implies that the topological …
-
Switching Current Distributions of Superconducting Nanowires: Evidence of Quantum Phase Slip Events
… topological fluctuation events that carry the superconducting order-parameter field between distinct current carrying states. Owing to these phase slips low-dimensional superconductors acquire electrical resistance. In quasi-one-dimensional nanowires it is well known that at higher temperatures …
-
Josephson Currents In Two-Gap Superconductor-Insulator- Superconductor Junctions
… interfaces due to an abrupt change in the superconducting order parameter, indicating that the two-gap superconductor SIS junction can yield a rich bound state structure in the energy gap. In this work, I study the mid-gap bound state energy of the two-gap superconductor-based short …
-
Inhomogeneous 1H NMR spin-lattice relaxation in the organic superconductor κ-(BEDT-TTF)2-Cu[N(CN)2]Br
… by thermal fluctuations in the phase of the superconducting order parameter. Below Tc, these fluctuations take the form of bound vortex-antivortex pairs that have no long-range effect on the phase. At Tc, they undergo a Kosterlitz-Thouless unbinding transition; the unbound vortices destroy …
-
Exploring strongly interacting gapless states : cuprates, pair density waves, and fluctuating superconductivity
… We discuss how Bogoliubov bands evolve when the superconducting order parameter is fluctuating. We compare theoretical predictions with existing experiments on angle-resolved photoemission spectroscopy (ARPES), infrared conductivity, diamagnetism, and lattice symmetry breaking. The material …
-
Superconducting Transition-Edge Sensor Physics
… record-setting performance demonstrated by superconducting Transition Edge Sensors (TESs) and growing utilization of the technology, a theoretical model of the physics governing TES devices superconducting phase transition has proven elusive. Earlier attempts to describe TESs assumed them to …
-
MATRIX FIELD THEORY: APPLICATIONS TO SUPERCONDUCTIVITY
… is developed to describe both clean and disordered s-wave and d-wave superconductors and the quantum phase transitions associated with them. The thesis can be divided into three parts. The first part includes chapters 1 to 3. In chapter one a general physical introduction is given. In …
-
Non-Sinusoidal Current -Phase Relations in Superconductor-Ferromagnet-Superconductor Josephson Junctions
… near Tpi, the temperature at which the first-order term switches between the 0-state and the pi-state. In SFS junctions, the interaction of the correlated electron states from the superconductor with the ferromagnet causes the superconducting order parameter to oscillate so that the ground …
-
Coexistence and Competition of Superconductivity and Magnetism
… which shows the coexistence of both forms of ordering. The temperature range over which this phase exists is seen to depend on the amount of nesting present in the Fermi surface and the relative strength of the magnetic interaction. The introduction of an anomolous term in the free energy …
-
Spin transport through nanopillar superconducting spin valves
… in the normal state, and also for devices in the superconducting state, which demonstrate a shorter spin decay length. This is supported by measurement of ∆Tc = TcAP − TcP , where Tc is the superconducting transition temperature of the device, and ∆Tc is negative for these CPP devices …
-
Ponto crítico quântico supercondutor em sistemas multi-bandas
… Nevertheless, the transitions involving superconducting phases are not as well explored theoretically as transitions involving magnetic phases. Thus, the study of superconduct- ing systems with treatments beyond mean ¯eld theories seems to be necessary to verify the behavior of …
-
Majorana qubits in non-Abelian topological superconductors
… topological degeneracy, thermal excitations and superconducting fluctuations which are not treated in the usual BCS mean-field theory. We calculate the tunneling splitting between non-Abelian vortices in both chiral p+ip superconductors and the superconductor/topological insulator het- …
-
Theory of voltage oscillations in ultra-small capacitance Josephson junctions
… quantum mechanical nature of the phase of the superconducting order parameter becomes important. Such quantum effects lead to novel behavior in the junction dynamics-supplying a constant current I to such a junction produces voltage or ""Bloch"" oscillations with a frequency WB = 211""1 /2e, …
-
Coupled one dimensional electron systems and stripe phases of high temperature superconductors
… which is indicative of the pinning of the CDW order at the impurity. Several dispersing features has been observed at frequencies above the spin gap, which provide a characteristic signature of spin-charge separation. This demonstrates that the boundary LDOS can be used to infer properties of …
Page 1 of 2