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Showing 1 to 20 of 75 for “"superconducting state"”.
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Nuclear resonance studies of the superconducting state of YBa2Cu3O7
Submitted by Carolyn Rauber (crauber2@illinois.edu) on 2012-01-20T22:35:03Z No. of bitstreams: 1 1993_martindale.pdf: 5380064 bytes, checksum: 4893b0ad106455429225a36167a26bbb (MD5)
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Nuclear magnetic resonance studies of YBa2̳Cu3̳07̳ in the superconducting state
… measurements of the 63Cu Knight shift in the · superconducting state for the plane (Cu(2)) and Chain (Cu(l)) sites in YBa2Cu307. We also have measured the temperature and field dependent 63Cu(2) nuclear spin relaxation rates (63Wla) in the superconducting state. The accurate determination of the …
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Nuclear magnetic resonance studies of yttrium barium copper oxide in the superconducting state
… of the $\sp{63}$Cu Knight shift in the superconducting state for the plane (Cu(2)) and chain (Cu(1)) sites in YBa$\sb2$Cu$\sb3$O$\sb7$. We also have measured the temperature and field dependent $\sp{63}$Cu(2) nuclear spin relaxation rates ($\sp{63}$W1$\alpha$) in the superconducting …
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Microwave Response in Superconducting Nanowires
We fabricate superconducting wires using molecular templating technique to study their transport properties when exposed to microwave radiation (MW), at cryogenic temperatures. Our wires have a diameter on the order of the zero temperature coherence length, which makes them quasi-one-dimensional at …
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Transport properties of anisotropic superconductors
… (UPt3, and UBe13 under pressure) the normal state transport properties at low temperatures behave qualitatively as one would expect if electron-impurity interactions were the dominant source of scattering. The experimental data on ultrasonic attenuation and thermal conduction in the …
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Low-temperature specific heat of several high-temperature superconductors in the superconducting and mixed states
… sintered polycrystalline samples of superconducting Ba$\sb{0.6}$K$\sb{0.4}$BiO$\sb3,$ YBa$\sb2$Cu$\sb3$O$\sb{6.7},$ and Bi$\sb2$Sr$\sb2$CaCu$\sb2$O$\sb{\rm 8+x}$ were measured in the superconducting state. Careful analysis of the data below 10K indicate that the contribution to the …
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Thermal conductivity of superconducting niobium
… dependence of the thermal conductivity of superconducting niobium have been measured in magnetic fields which ranged .. from zero to above the critical fields, and for temperatures which ranged from 0.31 K to above the transition temperature. Measurements were made on a single crystal …
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The magnetic properties of the cuprate superconductors
… cuprate superconductors in both the normal and superconducting states. The magnetic properties are studied by making comparison to the results of nuclear magnetic resonance experiments. The author gives a simplification of the method used to calculate the nuclear magnetic resonance spin-echo …
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Light scattering on the high-temperature superconductors
… limits: the insulating phase, the normal and superconducting state of the superconducting phase, and an optically induced metastable phase. In all cases, the analysis and proposed phenomenological models involved either an examination of the inelastic background scattering or the phonon …
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Spin transport through nanopillar superconducting spin valves
… the central Nb. This trend occurs 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 …
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An Ultrasonic Study of Trapped Hydrogen Tunneling Systems in Niobium and Tantalum
… to H in Nb was measured in both the normal and superconducting state at 10.8 MHz and 33 MHz at temperatures between 0.5 K and 18 K. The attenuation and velocity change due to trapped D in Nb was measured in both the superconducting and normal states for two concentrations of oxygen trapping …
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High Pressure Studies of Superconductivity
… vital in furthering our understanding of the superconducting state. Pressure allows researchers to enhance the properties of existing superconductors, to find new superconductors, and to test the validity of theoretical models. This thesis presents a series of high pressure measurements …
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Quantum many body physics in single and bilayer graphene
… phenomena. However, the vanishing density of states in charge neutral single layer graphene suppresses many body effects, and one has to alter the system to observe strongly ordered states. We consider three ways of accessing quantum many body physics using graphene. First, we consider doping …
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Superconducting transition temperatures of amorphous bismuth alloy films
… widths of the transitions of the films into the superconducting state were extremely small (- 5 millidegrees). This observation has a direct bearing on our understanding of coherence lengths in superconductors.
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Imaging topological superconductivity in UTe_2
… has ignited a new wave of interest in p-wave superconducting states as it offers the exciting prospect of measuring unusual surface electronic states, such as zero-energy Andreev bound states, and helical or chiral topological surface states. The latter state being a prerequisite for …
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Transport and relaxation properties in anisotropic superconductors
The nature of the superconducting state formed in some of the heavy fermion (HF) metals remains a subject of debate. In this thesis we give a theoretical analysis of some experiments which help to decide the issue. We give a detailed calculation of the nuclear spin relaxation time (T1 ) in …
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Spin-mixing and transport through superconducting interlayers in ferromagnetic Josephson junctions
The creation of spin-polarization in the superconducting state raises possibilities for low-energy logic and memory elements. Supercurrents of spin-aligned triplet Cooper pairs (or ’triplet pairs’) can be generated at magnetically inhomogeneous superconductor/ferromagnet interfaces, and have a …
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Optimization of superconducting magnetic bearings using finite element modeling
… project investigated the possibility of using superconducting bearings in large (3 - 100 MW) electric drives. Superconducting bearings are used to levitate the rotors inside electric drives via the Meiissner effect, whereby superconductors tend to repel magnetic flux. The Finite Element Method …
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Transmission of far infrared radiation through thin films of superconducting amorphous bismuth and gallium
… radiation transmitted through a thin film in the superconducting state to that transmitted through it in the normal state has been measured for several samples of amorphous bismuth and gallium. The transition temperature Tc of each film was also measured. Thicknesses were approximately in the …
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Thermally activated dislocation motion including inertial effects in solid solutions
… a dislocation does not change during the normal-superconducting transition when the damping coefficient decreases~ However, inertial effects in the superconducting state cause an increase in the amount of plastic strain for each breakaway process. The apparent decrease in the strength of a …
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