A5002701748- Cephalopods and Marine Biology
- Spider Taxonomy and Behavior Studies
- Isotope Analysis in Ecology
- Subterranean biodiversity and taxonomy
- Theoretical and Computational Physics
- Material Dynamics and Properties
- Marine Biology and Ecology Research
- Lepidoptera: Biology and Taxonomy
- Insect and Arachnid Ecology and Behavior
- Advanced Thermodynamics and Statistical Mechanics
- Orthoptera Research and Taxonomy
- Plant and animal studies
- Species Distribution and Climate Change
- Organic and Molecular Conductors Research
- Magnetic properties of thin films
- Collembola Taxonomy and Ecology Studies
- Coleoptera Taxonomy and Distribution
- Magnetism in coordination complexes
- Physics of Superconductivity and Magnetism
- Chemical synthesis and alkaloids
- Quantum and electron transport phenomena
- Marine and environmental studies
- Marine and coastal plant biology
- Fossil Insects in Amber
- Hemiptera Insect Studies
Arizona State University
2013-2024
University of Augsburg
2002
National Institute of Diabetes and Digestive and Kidney Diseases
1998
National Institutes of Health
1998
University of Pennsylvania
1912-1989
ExxonMobil (United States)
1988
University of California, Los Angeles
1981-1986
University of Utah
1942-1979
Harvard University
1914-1951
Stanford University
1929
The time decay of the thermoremanent magnetization (${\ensuremath{\sigma}}_{\mathrm{TRM}}$) has been measured in 1.0% Cu: Mn and 2.6% Ag: spin-glasses. It is shown that ${\ensuremath{\sigma}}_{\mathrm{TRM}}$ neither an algebraic nor a logarithmic function time, but it found can be characterized by "stretched" exponential: ${\ensuremath{\sigma}}_{\mathrm{TRM}}={\ensuremath{\sigma}}_{0}\mathrm{exp}[\ensuremath{-}\frac{C{(\ensuremath{\omega}t)}^{1\ensuremath{-}n}}{(1\ensuremath{-}n)}]$. Similar...
Large-amplitude, low-frequency electric fields can be used to burn spectral holes in the dielectric response of supercooled propylene carbonate and glycerol. This ability selectively modify establishes that non-Debye behavior results from a distribution relaxation times. Refilling hole was consistent with single recovery time coincided peak distribution. Moreover, refilling occurred without significant broadening, which indicates negligible direct exchange between degrees freedom responded...
We present high-resolution SQUID (superconducting quantum interference device) measurements of the dc magnetization on two Ag:Mn samples containing 2.6 and 4.0 at.% Mn. have measured in detail temperature dependence warming through glass temperature, ${T}_{G}$, (i) after cooling to $T<{T}_{G}$ a near-zero field then applying measurement field, zero-field cooled, (ii) field. This has been done for fields $0.5\ensuremath{\le}H\ensuremath{\le}500$ Oe. The derivative,...
The nonexponential response of propylene carbonate and glycerol near their glass transitions could be selectively altered using nonresonant spectral hole burning (NSHB) experiments. This observation provides evidence the existence a distribution relaxation times in these supercooled liquids. NSHB is based on pump, wait, probe scheme uses low-frequency large amplitude electrical fields to modify dielectric relaxation. temporal evolution polarization sample then measured subsequent small...
We have measured the dependence of upper critical magnetic field upon orientation for single-crystal samples Y${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ and ${\mathrm{Bi}}_{2.2}\mathrm{Ca}{\mathrm{Sr}}_{1.9}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8+x}$ via four-probe resistance. find continuous behavior ${H}_{c2}(\ensuremath{\theta})$ small deviations from parallel Y sample, as expected an anisotropic, three-dimensional superconductor. For Bi however, our data are more consistent with a...
We have established the zero-field freezing temperature and ${T}_{f}(H,\ensuremath{\omega})$ lines associated with a constant relaxation time over large frequency range (${10}^{\ensuremath{-}2}$-${10}^{5}$ Hz) in ${\mathrm{Eu}}_{0.4}$${\mathrm{Sr}}_{0.6}$S. The choice of experimental criterion demagnetizing field effects are analyzed some detail order to establish validity limits our analysis. Two different scalings tested as suggested by Binder Young: ${T}_{c}=0$,...
We have utilized a novel technique to measure both the magnetization and magnetoresistance of single crystal ${(\mathrm{TMTSF})}_{2}$Cl${\mathrm{O}}_{4}$ in regime where magnetic field induces series metal-to-semimetal transitions. find anisotropic with extremely sharp oscillatory structure similar that expected for quantized two-dimensional electron gas. However, temperature dependences anomalies suggest first-order phase transitions as opposed conventional de Haas-van Alphen effect. The...
We have used magnetotransport measurements to determine the phase diagram of ${(\mathrm{TMTSF})}_{2}$Cl${\mathrm{O}}_{4}$ from 0.5 10 K in magnetic fields 30 T. This organic metal becomes a spin-density-wave semimetal as temperature is reduced field greater than threshold ${H}_{c}(T=0)\ensuremath{\sim}3$ The critical ${T}_{c}(H)$ increases with agreement present theories, and reaches maximum 5.6 at 18 Above this field, however, decreases, extrapolating zero 17 reentrant not any theoretical model.
the greater number coming from latter place.The new Chinese species described form part of this collection, while North
The Weiss mean-field theory is applied to finite systems with unrestricted sizes, yielding a partition function for supercooled liquids. Finite-size effects broaden the transition and induce Curie-Weiss--like energy reduction which provides an explanation Vogel-Tamman-Fulcher law. Because intensive, basic thermodynamic unit (aggregate) subdivides into smaller regions (clusters) lowers net internal energy. distribution of aggregate combined relaxation rate that varies exponentially inverse...
A Gaussian size distribution of independently relaxing domains is used to model the response various glass-forming liquids. With a single temperature-dependent parameter, accurately characterizes observed dielectric susceptibility salol and glycerol [P. K. Dixon et al., Phys. Rev. Lett. 65, 1108 (1990); N. Menon J. Non-Cryst. Solids 141, 61 (1992)] over more than 13 orders magnitude in frequency. The quality range these data allow quantitative confirmation all assumptions model. As function...
The original article of Rudolf Kohlrausch (1854) on stretched exponentials and their application to describe relaxation phenomena has been often misquoted in the literature after its rediscovery around 1984. We discuss here this fact attempt set record straight.