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Showing 1 to 17 of 17 for “"magnetic transition"”.
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Topics in transport phenomena near the critical point
… electrical conductivity near the superconducting transition and to the calculation of the attenuation coefficient for longitudinal sound waves near the magnetic transition. The rise in the electrical conductivity as a material approaches its superconducting transition is described. Near T c small …
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An Investigation of the Magnetic and Electrical Properties of YNi3
… probe the quantum nature of the solid state in magnetic materials. Spin fluctuation theory is currentlythe most successful tool we have for trying to describe critical behaviour on the border of magnetism, and these materials are particularly suited to such investigations. In this thesis the …
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Quantum phenomena in disordered conductors
… the second part, we study the influence of non-magnetic transition element impurities on conventional superconductivity. We find that phonon coupling at impurities counteracts the traditional effects which dominate Tc suppression in the non-magnetic limit. In some cases, we predict that …
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Syntheses, Characterizations, and Properties of Suboxides and Layered Titanium-based Pnictide Oxide Superconductors
… The binary Ce3Si2 was found to exhibit antiferromagnetic behavior, with the Neel temperature of TN = 8 K. The oxygen interstitial phase, Ce3Si2O0.82 was found to be paramagnetic. This indicates that the introduction of oxygen as interstitial leads to the loss of long range magnetic ordering in …
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Magnetism, Structure and their Interactions
In my work, magnetic and structural transitions of three categories of compounds are investigated by density functional calculations under local spin density approximation (LSDA). The first compound is Rh2MnGe with full Heusler structure at ambient condition. However, the structure is unstable at …
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Development of High-Pressure Calorimetry Techniques and Calorimetry Study of the Heavy-Fermion Superconductor CeSb2
… Kondo lattice heavy fermion material with a ferromagnetic ground state and various magnetic transitions at low temperatures. Between 6kbar and 16kbar, CeSb<sub>2</sub> undergoes a structural transformation that destroys the ferromagnetism, but reveals a new transition to a magnetically ordered …
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Picosecond Spin Seebeck Effect in Magnetic Insulators
… (SSE) refers to spin current generation in a magnetic insulator/non-magnetic metal heterostructure due to a thermal gradient and most SSE experiments typically use an electric current as heat source. This study uses Terahertz (THz) time-domain emission spectroscopy where a femtosecond laser …
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Polymer Stabilized Magnetite Nanoparticles and Poly(propylene oxide) Modified Styrene-Dimethacrylate Networks
Magnetic nanoparticles that display high saturation magnetization and high magnetic susceptibility are of great interest for medical applications. Nanomagnetite is particularly desirable because it displays strong ferrimagnetic behavior, and is less sensitive to oxidation than magnetic transition …
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Synthesis And Characterization Of Transition Metal Arsenide Nanocrystals And The Metastability And Magneto-Structural Phase Transition Behavior Of Mnas Nanocrystals
… (3) developing a general synthetic method for transition metal arsenide nanoparticles.</p> <p>Discrete MnAs nanoparticles that adopt different structures at room temperature (type-A, α-structure and type-B, β-structure) have been prepared by the solution-phase arrested precipitation method. …
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Superconductivity in the proximity of a quantum critical point
… fermionic system, the suppression of continuous transitions to absolute zero can result in a low temperature quantum fluid which deviates strongly from typical metallic behaviour; unconventional superconductivity can be induced by the strange metal region surrounding the zero-temperature phase …
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Competition and unification of Kondo coherence and magnetic ordering
… is a quantum critical point separating a non-magnetic heavy fermi liquid metal from an antiferromagnetically ordered metal. The major problem facing us is the fact that, based on new experiments, these two phases seem to collapse simultaneously at the quantum critical point, giving rise to a …
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High-precision QED calculations of the hyperfine structure in hydrogen and transition rates in multicharged ions
… scheme for the determination of the Zemach and magnetic radii of the proton is proposed. As a result, the Zemach and magnetic radii are determined and the values are compared with the corresponding ones deduced from data obtained in electron-proton scattering experiments. The extraction of the …
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Some applications of the renormalization group
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-13T15:30:47Z No. of bitstreams: 1 1983_ma.pdf: 2732223 bytes, checksum: 7c77724bb1fc90e33cb3c86453dc4aa0 (MD5)
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EXPLORATION OF NEW MAGNETOCALORIC AND MULTIFUNCTIONAL MAGNETIC MATERIALS
The magnetic properties of NiMnGe1−xAlx, Ni50Mn35(In1−xBx)15, Ni50Mn35In14.5B0.5 (Bulk, As-Solidified and Annealed melt-spun ribbon) and RE-Infuse Carbon Nanotubes, have been studied by x-ray diffraction, differential scanning calorimetry (DSC), and magnetization measurements. Partial substitution …
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AB initio study and design of 2D materials/III-nitrides-based post-CMOS devices using first-principles multiphysics simulation framework
… including groups III and IV dopants, as well as magnetic transition metal atoms such as Mn, Fe, Co, V, Nb, and Ta. By using DFT over a 5x5 atomic cell, we identify the most promising element candidates for p-doping of MoS2. Specifically, we found VB group impurity elements, such as Ta, …
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Functional materials for thermal regulation
… semiconductor to metal phase transition as supported by Raman spectroscopy. Further, the ratio of the in-plane to through-plane thermal conductivity is enhanced by the disorder in bulk crystals. These results suggest that stacking disorder and mixture of phases is an effective …
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Density, magnetic properties and sound velocities of iron-rich materials at high temperature and high pressure
… using high-resolution XRD and CMS methods. A magnetic transition in Fe3C from the low-pressure ferromagnetic phase to a high-pressure non-magnetic phase was reported in literature; however, the transition pressure has been controversial, ranging from 9 GPa to 25 GPa. The effect of this …