A5047679420- Physics of Superconductivity and Magnetism
- Advanced Condensed Matter Physics
- Rare-earth and actinide compounds
- Magnetic properties of thin films
- Iron-based superconductors research
- Theoretical and Computational Physics
- Superconducting Materials and Applications
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Organic and Molecular Conductors Research
- Magnetic Properties of Alloys
- Magnetism in coordination complexes
- High-pressure geophysics and materials
- Advanced Battery Technologies Research
- Quantum and electron transport phenomena
- Geomagnetism and Paleomagnetism Studies
- Hybrid Renewable Energy Systems
- Advancements in Battery Materials
- Magnetic confinement fusion research
- Surface and Thin Film Phenomena
- Inorganic Chemistry and Materials
- Methane Hydrates and Related Phenomena
- Advanced Chemical Physics Studies
- Acoustic Wave Resonator Technologies
- Magnetic Bearings and Levitation Dynamics
Argonne National Laboratory
2014-2023
University of Illinois Chicago
2012-2022
Purdue University West Lafayette
2020
Energy Storage Systems (United States)
2019-2020
University of Illinois Urbana-Champaign
2012-2019
Brookhaven National Laboratory
2011
Sandia National Laboratories
2011
University of Michigan
2011
Weizmann Institute of Science
2011
The University of Texas at El Paso
2011
If the fuel cell is to become modern steam engine, basic research must provide breakthroughs in understanding, materials, and design make a hydrogen-based energy system vibrant competitive force
The structural properties of oxygen-deficient ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ have been determined by neutron powder diffraction for 0.07<\ensuremath{\delta}<0.91. samples were produced quenching into liquid nitrogen from controlled oxygen partial pressures at 520 \ifmmode^\circ\else\textdegree\fi{}C, and they exhibit a clearly defined ``plateau'' behavior ${T}_{c}$ versus \ensuremath{\delta}....
If solar energy is to become a practical alternative fossil fuels, we must have efficient ways convert photons into electricity, fuel, and heat. The need for better conversion technologies driving force behind many recent developments in biology, materials, especially nanoscience.
Energy storage is an integral part of modern society. A contemporary example the lithium (Li)-ion battery, which enabled launch personal electronics revolution in 1991 and first commercial electric vehicles 2010. Most recently, Li-ion batteries have expanded into electricity grid to firm variable renewable generation, increasing efficiency effectiveness transmission distribution. Important applications continue emerge including decarbonization heavy-duty vehicles, rail, maritime shipping,...
A future electric transportation market will depend on battery innovation
The behavior of vortex matter in high-temperature superconductors (HTS) controls the entire electromagnetic response material, including its current carrying capacity. Here, we review basic concepts pinning and application to a complex mixed landscape enhance critical reduce anisotropy. We focus on recent scientific advances that have resulted large enhancements in-field state-of-the-art second generation (2G) YBCO coated conductors prospect an isotropic, high-critical superconductor...
The study of the anisotropic superconductor MgB2 using a combination scanning tunneling microscopy and spectroscopy reveals two distinct energy gaps at Delta(1)=2.3 meV Delta(2)=7.1 4.2 K. Different spectral weights partial superconducting density states are reflection different directions in this multiband system. Temperature evolution spectra follows BCS scenario [Phys. Rev. Lett. 3, 552 (1959)]] with both vanishing bulk T(c). data confirm importance Fermi-surface sheet dependent...
Magnetization measurements were performed on single crystals of $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ to study the effect fast neutron irradiation flux pinning and critical magnetization current. Neutron up a fluence 8.16\ifmmode\times\else\texttimes\fi{}${10}^{17}$ n/${\mathrm{cm}}^{2}$ systematically enhanced magnitude reduced anisotropy current compared unirradiated samples. The largest increases in occurred at 77 K. There was...
Moving- and stationary-sample SQUID magnetometry indicates discontinuous jumps of the magnetization an untwinned single crystal ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$. The location these in $H$- $T$ plane coincides with resistive drops measured on same sample. These results demonstrate existence a first-order melting transition flux line lattice
Gaussian fluctuations have been observed in the specific heat of two single crystals ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$. Deviations from a BCS-type step are well accounted for by 3D whose amplitude ratio, cleaner sample, implies that number order-parameter components is 7\ifmmode\pm\else\textpm\fi{}2. This result inconsistent with an O(2) Ginzburg-Landau theory.
Resistive-type palladium structures for hydrogen sensing remains as a research focus their simplicity in device construction. We demonstrate that siloxane self-assembled monolayer placed between substrate and an evaporated ultrathin Pd film promotes the formation of small nanoclusters reduces stiction substrate. The resulting nanocluster can detect 2%H2 with rapid response time ∼70ms is sensitive to 25 ppm hydrogen, detectable by 2% increase conductance due hydrogen-induced lattice expansion.
Porous alumina membranes are commercially available and have been widely used in recent nanoscale research, for example, as templates nanowire fabrication through electrodeposition. In this report, we present a new use porous the of nanotubes/nanowires desired electrochemical devices catalytic applications. A high yield is obtained by etching an aqueous sodium hydroxide solution. We studied effects time solution concentration characterized using scanning electron microscope (SEM). discussion...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmbient-pressure superconductivity at 2.7 K and higher temperatures in derivatives of (BEDT-TTF)2IBr2: synthesis, structure, detection superconductivityJack M. Williams, Hau H. Wang, Mark A. Beno, Thomas J. Emge, L. Sowa, P. T. Copps, F. Behroozi, N. Hall, K. Douglas Carlson, G. W. CrabtreeCite this: Inorg. Chem. 1984, 23, 24, 3839–3841Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Published inissue 1...
We report structure, resistivity, and Meissner effect measurements on YBa2−xSrxCu3O7−δ for 0&lt;x&lt;2.0. find a region of solid solubility extending at least to x=1.0 monotonic depression Tc with x. Using arguments based structural changes Sr doping, we speculate that the is due local distortion lattice in neighborhood site introduction additional oxygen vacancies.
We present the first direct measurements of ${\mathit{T}}_{\mathit{c}}$ as a function uniaxial stress ${\mathit{p}}_{\mathit{i}}$ (i=a,b,c) along crystal axes for an untwinned ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ single crystal. is linear in with slopes ${\mathit{dT}}_{\mathit{c}}$/${\mathit{dp}}_{\mathit{a}}$=-2.0\ifmmode\pm\else\textpm\fi{}0.2 K/GPa,...
The discovery of high-temperature superconductors has stimulated dramatic growth in our understanding the physics quantized vortex lines. These exclude magnetic fields weaker than a lower critical field Hc1≤10−2 tesla. Stronger penetrate as an array vortices, each consisting exactly one quantum flux (φ0 = hc/2e) surrounded plane perpendicular to by circulating supercurrents that extend radially few hundred nanometers. behavior vortices dominates many physical properties up upper Hc2∼102...
Neutron-diffraction and bulk resistivity measurements on single crystals of Er${\mathrm{Rh}}_{4}$${\mathrm{B}}_{4}$ have revealed an intermediate phase below 1.2 K, where both a ferromagnetic structure transverse linearly polarized modulated structure, with wavelength \ensuremath{\sim} 100 \AA{}, are observed. The moment disappears suddenly 0.71 loss superconductivity transition to normal state. is interpreted as being one coexisting domains superconducting domains.
We present direct evidence of a "peak effect" as precursor to vortex lattice melting in single crystal $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ containing only two twin planes. The peak effect occurs just below the liquid solid phase transition narrow field region between 0.3 and 1.5 T for $H\ensuremath{\parallel}\mathbf{c}$ is clearly observed function both magnetic temperature. demonstrate that due enhanced pinning by boundaries,...
Achieving a fundamental understanding of the phenomena that will underpin both global stewardship and future technologies in energy calls for thoughtful balance between large-scale immediate solutions using existing technology research needed to provide better 50-year period.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxygen content of superconducting perovskites, lanthanum strontium copper oxide La2-xSrxCuOy and yttrium barium YBa2Cu3OyEvan H. Appelman, Lester R. Morss, Aravinda M. Kini, Urs Geiser, A. Umezawa, G. W. Crabtree, K. Douglas CarlsonCite this: Inorg. Chem. 1987, 26, 20, 3237–3239Publication Date (Print):October 1, 1987Publication History Published online1 May 2002Published inissue 1 October 1987https://doi.org/10.1021/ic00267a003Request reuse...