99 research outputs found
Technique for Magnetic Susceptibility Determination in the High Doped Semiconductors by Electron Spin Resonance
Method for determining the magnetic susceptibility in the high doped
semiconductors is considered. A procedure that is based on double integration
of the positive part of the derivative of the absorption line having a Dyson
shape and takes into account the depth of the skin layer is described. Analysis
is made for the example of arsenic doped germanium samples at a rather high
concentration corresponding to the insulator metal phase transition.Comment: Pages 13, figures 9, references 1
Negative magneto-resistance of electron gas in a quantum well with parabolic potential
We have studied the electrical conductivity of the electron gas in parallel
electric and magnetic fields directed along the plane of a parabolic quantum
well (across the profile of the potential). We found a general expression for
the electrical conductivity applicable for any magnitudes of the magnetic field
and the degree of degeneration of the electron gas. A new mechanism of
generation of the negative magnetoresistance has been revealed. It has been
shown that in a parabolic quantum well with a non-degenerated electron gas the
negative magnetoresistance results from spin splitting of the levels of the
size quantization.Comment: 15 pages, 3 figure
Unconventional magnetism in all-carbon nanofoam
We report production of nanostructured carbon foam by a high-repetition-rate,
high-power laser ablation of glassy carbon in Ar atmosphere. A combination of
characterization techniques revealed that the system contains both sp2 and sp3
bonded carbon atoms. The material is a novel form of carbon in which
graphite-like sheets fill space at very low density due to strong hyperbolic
curvature, as proposed for ?schwarzite?. The foam exhibits ferromagnetic-like
behaviour up to 90 K, with a narrow hysteresis curve and a high saturation
magnetization. Such magnetic properties are very unusual for a carbon
allotrope. Detailed analysis excludes impurities as the origin of the magnetic
signal. We postulate that localized unpaired spins occur because of topological
and bonding defects associated with the sheet curvature, and that these spins
are stabilized due to the steric protection offered by the convoluted sheets.Comment: 14 pages, including 2 tables and 7 figs. Submitted to Phys Rev B 10
September 200
Edge state magnetism in zigzag-interfaced graphene via spin susceptibility measurements
Development of graphene spintronic devices relies on transforming it into a material with a spin order. Attempts to make graphene magnetic by introducing zigzag edge states have failed due to energetically unstable structure of torn zigzag edges. Here, we report on the formation of nanoridges, i.e., stable crystallographically oriented fluorine monoatomic chains, and provide experimental evidence for strongly coupled magnetic states at the graphene-fluorographene interfaces. From the first principle calculations, the spins at the localized edge states are ferromagnetically ordered within each of the zigzag interface whereas the spin interaction across a nanoridge is antiferromagnetic. Magnetic susceptibility data agree with this physical picture and exhibit behaviour typical of quantum spin-ladder system with ferromagnetic legs and antiferromagnetic rungs. The exchange coupling constant along the rungs is measured to be 450 K. The coupling is strong enough to consider graphene with fluorine nanoridges as a candidate for a room temperature spintronics material
Heat Resistance Mediated by a New Plasmid Encoded Clp ATPase, ClpK, as a Possible Novel Mechanism for Nosocomial Persistence of Klebsiella pneumoniae
Klebsiella pneumoniae is an important opportunistic pathogen and a frequent cause of nosocomial infections. We have characterized a K. pneumoniae strain responsible for a series of critical infections in an intensive care unit over a two-year period. The strain was found to be remarkably thermotolerant providing a conceivable explanation of its persistence in the hospital environment. This marked phenotype is mediated by a novel type of Clp ATPase, designated ClpK. The clpK gene is encoded by a conjugative plasmid and we find that the clpK gene alone renders an otherwise sensitive E. coli strain resistant to lethal heat shock. Furthermore, one third of a collection of nosocomial K. pneumoniae isolates carry clpK and exhibit a heat resistant phenotype. The discovery of ClpK as a plasmid encoded factor and its profound impact on thermal stress survival sheds new light on the biological relevance of Clp ATPases in acquired environmental fitness and highlights the challenges of mobile genetic elements in fighting nosocomial infections
Adjustable synchronous electric drives of shaft fans with vector-based control oriented in the field
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