Steven D. Conradson
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View article: Nanoscale Lattice Heterostructure in High-Tc Superconductors
Nanoscale Lattice Heterostructure in High-Tc Superconductors Open
Low-temperature superconductivity has been known since 1957 to be described by BCS theory for effective single-band metals controlled by the density of states at the Fermi level, very far from band edges, the electron–phonon coupling const…
View article: Nanoscale lattice heterostructure in high Tc superconductors
Nanoscale lattice heterostructure in high Tc superconductors Open
Low temperature superconductivity was known since 1957 to be described by BCS theory for an effective single band metals controlled by the density of states at the Fermi level, very far from band edges, the electron phonon coupling, and th…
View article: Non-stoichiometric and Subnano-heterogeneous Ln-incorporated UO2: its defect chemistry and thermal oxidation
Non-stoichiometric and Subnano-heterogeneous Ln-incorporated UO2: its defect chemistry and thermal oxidation Open
The defect chemistry and thermal oxidation of lanthanide (Ln) incorporated-UO2 are critical for understanding and predicting their behavior as enhanced fuels, mixed oxide (MOX) fuels, spent nuclear fuels (SNF), and particles for safeguard …
View article: Charge-lattice coupling and the dynamic structure of the U–O distribution in UO2+x
Charge-lattice coupling and the dynamic structure of the U–O distribution in UO2+x Open
The different structures and behaviors of UO 2+x observed in crystallographic and local structure measurements were examined by extended X-ray absorption fine structure (EXAFS) measurements of pristine UO 2.0 , p + and He 2+ irradiated UO …
View article: Environmental stability of a uranium-plutonium-carbide phase
Environmental stability of a uranium-plutonium-carbide phase Open
A plutonium-rich carbide, (U,Pu)(Al,Fe) 3 C 3 , was discovered in a hot particle from the Maralinga nuclear testing site in South Australia. The particle was produced between 1960 and 1963 and has been exposed to ambient conditions since t…
View article: Extrinsic colloid formation mechanisms: inhomogeneities in U/PuO(2+x)
Extrinsic colloid formation mechanisms: inhomogeneities in U/PuO(2+x) Open
View article: Probing the luminescence spectroscopy of uranyl and neptunyl heteropolyoxotungstate complexes
Probing the luminescence spectroscopy of uranyl and neptunyl heteropolyoxotungstate complexes Open
View article: Actinide oxides. Structure, bonding and environmental transport
Actinide oxides. Structure, bonding and environmental transport Open
View article: Environmental chemistry of actinide species at contaminated sites
Environmental chemistry of actinide species at contaminated sites Open
View article: Solution route to high quality epitaxial actinide films: from oxides to carbides
Solution route to high quality epitaxial actinide films: from oxides to carbides Open
View article: Actinide speciation and chemical behavior at contaminated sites
Actinide speciation and chemical behavior at contaminated sites Open
View article: Covalency trends in MCl62: a Cl K-edge study of metal-ligand bonding
Covalency trends in MCl62: a Cl K-edge study of metal-ligand bonding Open
View article: Corrosion in Ga-Stabilized Plutonium
Corrosion in Ga-Stabilized Plutonium Open
View article: Quantifying Orbital Mixing In Actinide-Oxygen & Carbon Bonds With Ligand K-edge X-ray Absorption Spectroscopy
Quantifying Orbital Mixing In Actinide-Oxygen & Carbon Bonds With Ligand K-edge X-ray Absorption Spectroscopy Open
No abstract prepared.
View article: X-ray absorption fine structure spectroscopic determination of plutonium speciation at the Rocky Flats environmental technology
X-ray absorption fine structure spectroscopic determination of plutonium speciation at the Rocky Flats environmental technology Open
X-ray Absorption Fine Structure spectroscopy was used to probe the speciation of the ppm level Pu in thirteen soil and concrete samples from the Rocky Flats Environmental Technology Site in support of the site remediation effort that has b…
View article: Pu speciation in actual and simulated aged wastes
Pu speciation in actual and simulated aged wastes Open
X-ray Absorption Fine Structure Spectroscopy (XAFS) at the Pu L{sub II/III} edge was used to determine the speciation of this element in (1) Hanford Z-9 Pu crib samples, (2) deteriorated waste resins from a chloride process ion-exchange pu…
View article: Co-operativity among defect sites in AnO2+ and An4O9 (An = U, Np or Pu)
Co-operativity among defect sites in AnO2+ and An4O9 (An = U, Np or Pu) Open
Actinide dioxides derived from the AnO{sub 2} fluorite lattice are of high technological relevance due to their application in nuclear reactor fuels. Oxidation of AnO{sub 2} compounds emerges as a central theme in fuel fabrication, reactor…
View article: Correlation of strontium anharmonicity with charge-lattice dynamics of the apical oxygens and their coupling to cuprate superconductivity
Correlation of strontium anharmonicity with charge-lattice dynamics of the apical oxygens and their coupling to cuprate superconductivity Open
By means of Cu K edge x-ray absorption spectra of overdoped high-pressure oxygenated superconducting and , we demonstrate a remarkably strong three way correlation between the superconductivity and the loca…
View article: Crystallization of polarons through charge and spin ordering transitions in 1T-TaS2
Crystallization of polarons through charge and spin ordering transitions in 1T-TaS2 Open
The interaction of electrons with the lattice in metals can lead to reduction of their kinetic energy to the point where they may form heavy, dressed quasiparticles—polarons. Unfortunately, polaronic lattice distortions are difficult to di…
View article: Tc Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates
Tc Saturation and Possible Electronic Phase Separation in Strongly Overdoped Cuprates Open
In order to elucidate the unusual superconducting properties of cuprates in the strongly overdoped region, i.e., at hole-doping levels p≳0.4/Cu in the CuO2 plane, we study the structural and superconducting properties of a series of Cu0.75…
View article: High-Tc superconductivity in strongly overdoped cuprates
High-Tc superconductivity in strongly overdoped cuprates Open
View article: The path to Wigner crystallization in the 2D polaron quantum spin liquid candidate system 1T-TaS2
The path to Wigner crystallization in the 2D polaron quantum spin liquid candidate system 1T-TaS2 Open
Interesting emergent behavior in quantum materials arises when the interaction of electrons with the lattice leads to localization and ordering. The triangular lattice of some transition metal dichalcogenides results in additional interpla…
View article: Kuramoto synchronization of quantum tunneling polarons for describing the dynamic structure in cuprate superconductors
Kuramoto synchronization of quantum tunneling polarons for describing the dynamic structure in cuprate superconductors Open
A major open topic in cuprates is the interplay between the lattice and electronic dynamics and the importance of their coupling to the mechanism of high-temperature superconductivity (HTSC). As evidenced by extended x-ray absorption fine …
View article: Oxidation pathways of UO<sub>2</sub> thin film under combined oxygen-humidity-radiation conditions probed by XAFS
Oxidation pathways of UO<sub>2</sub> thin film under combined oxygen-humidity-radiation conditions probed by XAFS Open
View article: Evolution of Charge-Lattice Dynamics across the Kuramoto Synchronization Phase Diagram of Quantum Tunneling Polarons in Cuprate Superconductors
Evolution of Charge-Lattice Dynamics across the Kuramoto Synchronization Phase Diagram of Quantum Tunneling Polarons in Cuprate Superconductors Open
Because of its sensitivity to the instantaneous structure factor, S(Q,t = 0), Extended X-ray Absorption Fine Structure (EXAFS) is a powerful tool for probing the dynamic structure of condensed matter systems in which the charge and lattice…
View article: Extremely Overdoped Superconducting Cuprates via High Pressure Oxygenation Methods
Extremely Overdoped Superconducting Cuprates via High Pressure Oxygenation Methods Open
Within the cuprate constellation, one fixed star has been the superconducting dome in the quantum phase diagram of transition temperature vs. the excess charge on the Cu in the CuO2-planes, p, resulting from O-doping or cation substitution…
View article: Correlation of strontium anharmonicity with charge-lattice dynamics of the apical oxygens and their coupling to cuprate superconductivity
Correlation of strontium anharmonicity with charge-lattice dynamics of the apical oxygens and their coupling to cuprate superconductivity Open
Cu K edge X-ray absorption spectra of overdoped superconducting $YSr_2Cu_{2.75}Mo_{0.25}O_{7.54}$ and $Sr_2CuO_{3.3}$ show a remarkably strong correlation of their superconductivity with the local dynamics of their Cu-Sr and Cu-apical-O pa…
View article: The nature of Pu-bearing particles from the Maralinga nuclear testing site, Australia
The nature of Pu-bearing particles from the Maralinga nuclear testing site, Australia Open
View article: Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr <sub>2</sub> Cu <sub>2.75</sub> Mo <sub>0.25</sub> O <sub>7.54</sub> and Sr <sub>2</sub> CuO <sub>3.3</sub>
Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr <sub>2</sub> Cu <sub>2.75</sub> Mo <sub>0.25</sub> O <sub>7.54</sub> and Sr <sub>2</sub> CuO <sub>3.3</sub> Open
Significance The Cu extended X-ray absorption fine structure of YSr 2 Cu 2.75 Mo 0.25 O 7.54 (with superconducting critical temperature, T c , = 84 K) and Sr 2 CuO 3.3 (T c = 95 K) through their superconducting transitions demonstrates tha…
View article: Local lattice distortions and dynamics in extremely overdoped superconducting YSr <sub>2</sub> Cu <sub>2.75</sub> Mo <sub>0.25</sub> O <sub>7.54</sub>
Local lattice distortions and dynamics in extremely overdoped superconducting YSr <sub>2</sub> Cu <sub>2.75</sub> Mo <sub>0.25</sub> O <sub>7.54</sub> Open
Significance We show that a second-phase diagram is needed to describe “overdoped” cuprates prepared by high-pressure oxygen methods. The transition temperatures of HPO compounds continue to increase past the values of O stoichiometry and …