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 20 for “"Sr2RuO4"”.
-
Numerical study of p-wave superconductivity in Sr2RuO4
… studies of the superconducting state of Sr2RuO4. This material's magnetic response displays hc=4e periodicity in multiply connected samples, a striking departure from hc=2e periodicity of the Little-Parks effect. One likely explanation for this is that, instead of the Cooper pairs …
-
Growth, Characterization and Measurement of Epitaxial Sr2RuO4 Thin Films
In this thesis, the growth of c-axis oriented Sr2RuO4 thin films using pulsed laser deposition and their electrical transport properties are systematically discussed. The deposition and optimization process involved several progressive steps. Specifically, the first focus was on the Sr2RuO4 phase …
-
Superconducting order parameter domains in Sr2RuO4 probed by Josephson interferometry
… 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 critical current modulations in an applied magnetic field …
-
Temperature dependence of the penetration depth in the unconventional superconductor Sr2RuO4
… single crystals of the perovskite superconductor Sr2RuO4 down to 0.04 K. We observe quadratic temperature dependence at low temperatures. There is no sign of the crossover or second phase transition predicted for a multi-band superconductor. We argue that power law behavior is consistent with an …
-
Investigation of half-quantized fluxoid states in Sr2RuO4 mesoscopic superconducting rings
… measurements performed on mesoscopic samples of Sr2RuO4, a spin-triplet superconductor. Satisfying the total anti-symmetric property of the Cooper pair wave function, Sr2RuO4 is theoretically suggested to have angular momentum and form domain structure with order parameter that corresponds to . …
-
Probing the chiral domain structure and dynamics in SR2RUO4 with nanoscale Josephson junctions
Previous work on Sr2RuO4 has shown that the superconducting state is unconventional with an order parameter symmetry of px ipy. Measurements using Josephson Interferometry have shown evidence for chiral order parameter domains on the order of 1 m in size. To further search for signatures of these …
-
Pulsed laser deposition of superconducting Sr2RuO4 thin-films and the role of crystallographic defects
Sr2RuO4 (SRO214) is a prototypical unconventional superconductor. However, since the discovery of superconductivity a quarter of a century ago, the symmetry of the bulk and surface superconducting states in single-crystal SRO214 remains highly controversial. Solving this problem is impeded by the …
-
Penetration Depth Studies of Unconventional Superconductors
… Y, Lu, Er, Ho), the spin-triplet superconductor Sr2RuO4, and elemental Pb. From these studies we see how superconductivity is affected by the presence of another order, such as paramagnetism/antiferromagnetism (in ErNi2B2C) or spin-density-wave (in Pb). We also see how the superfluid response is …
-
Collective modes in strongly correlated electron systems measured with momentum-resolved electron energy-loss spectroscopy
… material is the unconventional superconductor Sr2RuO4 that has been proposed to be a rare spin-triplet superconductor. The normal state of Sr2RuO4 is thought to have strong interaction effects that may be key to understanding the nature of the superconducting state. The dispersions of the …
-
Explorations of domain walls and half quantum vortices in unconventional superconductors
… superconducting order. An exception is Sr2RuO4, for which evidence is accumulating in favor of superconducting order of spin-triplet character, specifically of the equal-spin type of pairing and, furthermore, which may exibit spontaneously broken time reversal symmetry. Triplet …
-
Study of the effect of spin-orbit interaction in solids
… pak je porovnáme pro jednoduchý případ krystalu Sr2RuO4. Ukážeme, že oba modely dávají v tomto případě velmi podobné výsledky. 1
-
Some effects of dimensionality and defects on superconductivity
… of planar defects on the superconductivity of Sr2RuO4 thin films. We find that while parallel planar defects does not decrease the the transition temperature of superconductivity, defects that are perpendicular with each other are able to suppress the superconductivity. In Chapter 4, we study …
-
Temperature Dependence of the Penetration Depth in the Unconventional Superconductor Strontium Ruthenate
… single crystals of the perovskite superconductor Sr2RuO4 down to 0.04 K. We observe quadratic temperature dependence at low temperatures. There is no sign of the crossover or second phase transition predicted for a multi-band superconductor. We argue that power law behavior is consistent with an …
-
Beyond the isotropic two-dimensional Heisenberg model: Raman scattering studies of the transition between isotropic and anisotropic spin dynamics in Sr2IrO4
With discovery of novel superconductivity in Sr2RuO4 and the exciting theoretical results regarding strong spin-orbit couple regime, iridate compounds have come to a focus in many experimental and theoretical studies. Especially, Sr2IrO4 has come to special interest due to 3-d parent compoun …
-
Superconducting Order Parameter Domains in Strontium Ruthenate Probed by Josephson Interferometry
… We study bi-metallic Josephson junctions made of Sr2RuO4 and a conventional superconductor. Their critical current modulations in an applied magnetic field carry information about the phase of the order parameter of the ruthenate. In these junctions, we observe multiple phase interference in a …
-
Some properties of the magnetic response of mesoscopic superconducting rings
… superconductivity of a strongly layered compound Sr2RuO4 . We show that a half-quantum vortex (HQV) should be accompanied by the kinematic spin polarization which is caused by the velocity mismatch between different superfluid components. We also suggest that under appropriate conditions the …
-
Growth and Characterization of Epitaxial Oxide Thin Films
… Attempts were also made towards depositing Sr2RuO4 films on LaSrAlO4 (110) substrates, which can act as a bottom electrode for ferroelectric SBT films.
-
Imaging vortex dynamics in Josephson arrays using magnetic force microscopy
… such as the spin triplet pairing predicted in Sr2RuO4, or in topological insulators paired to s-wave superconductors, contain two condensates that may support two vortex lattices, and may display Majorana modes, signatures of which may have been seen in other superconducting systems[13–17]. The …
-
Stress and crystal imperfections: Tools for the exploration of unconventional superconductivity via scanning tunneling microscopy
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms