Titel: HFI/NQI 2007
Dateigröße in MByte: 41.
8. April 2010 - pdf eBook
This volume of proceedings includes new and original scientific results along with recent developments in instrumentation and methods, in invited and contributed papers. Researchers and graduate students interested in hyperfine interaction detected by nuclear radiation as well as nuclear quadrupole interactions detected by resonance methods in the areas of materials, biological and medical science will find this volume indispensable.
Theory: Hyperfine Interactions and Nuclear Moments.
EFG calculations for Cu2+ compounds.
First principles study of nuclear quadrupole interactions in the molecular solid BF3 and the nature of binding between the molecules.
Hyperfine interactions of half-metallic diluted antiferromagnetic semiconductors.
Electronic properties of HffXY intermetallic compounds (X =Si, Ge; Y =S, Se, Te).
Electronic properties of Hf2X intermetallic compounds (X =Al, Si, Ni, Ga and Ge).
Theory of electronic structure and nuclear quadrupole interactions in the BF3-NH3 complex and methyl derivatives.
Nuclear quadrupole interactions and electronic structure of BF3.H2O complex.
Understanding of nuclear quadrupole interactions of 35Cl, 79Br and 129I and binding energies of solid halogens at first-principles level.
Nuclear spin manipulation in interfaces of diluted magnetic semiconductors.
Magnetism and Magnetic Materials: Bulk and Thin Layers.
Magnetic properties of Heisenberg triangular antiferromagnet V15 cluster studied by NMR.
Temperature dependence of the magnetic hyperfine field at cerium impurity in Co.
Magnetic hyperfine fields at Gd and in sites in GdPdIn compound.
Study of hyperfine interactions in the intermetallic compound CePd2Si2 using PAC technique with 111Cd as probe nuclei.
Mössbauer characterization of Fe-doped ZnO prepared by mechanical milling.
Temperature dependence of the hyperfine fields in NiFe2O4 and CuFe2O4 oxides.
Hyperfine interactions at R and In sites in RNiIn (R =Gd, Tb, Dy, Ho) compounds measured by perturbed angular correlation spectroscopy.
Synthesis and thermal transformations of zinc-substituted magnetites.
Magnetic characterization of maghemite nanoparticles dispersed in surface-treated polymeric template.
Investigation of the different nature of magnetic hyperfine fields of Ce probes in Gd and Co matrices.
Magnetic properties of rare-earth permanent magnets under a high radiation environment.
HFI Probes in Semiconductors, Metals, and Insulators.
Defects in semiconductors-results from Mössbauer spectroscopy.
Site preferences of indium impurity atoms in intermetallics having Al3Ti or Al3Zr crystal structures.
Phosphorus-doped silicon under uniaxial tensile strain investigated by PAC.
The gap level of bond-centred muonium in diamond.
Characterization of palladium-related defects in silicon.
Low temperature nuclear orientation observations of severe neutron activation damage in (160Tb)TbNiAl4.
Simulation of PAC spectra for spin 5/2 probes diffusing via a simple vacancy mechanism in Cu3Au-structured intermetallic compounds.
Perturbed angular correlation measurement of the electric field gradient at 181Ta in ZrSiO4 and HfSiO4.
XRD, TDPAC and LAPW study of Hf10B2 under high pressure.
Determination of quadrupole splitting for 57Fe in M1 and M2 sites of both olivine and pyroxene in ordinary chondrites using Mössbauer spectroscopy with high velocity resolution.
Study of hyperfine interactions in carbonaceous chondrite Isheyevo (CH/CB) using Mössbauer spectroscopy with high velocity resolution.
Study of metal grains extracted from chondrite Tsarev L5 using Mössbauer spectroscopy with high velocity resolution.
Temperature dependence of the electric field gradient in GaN measured with the PAC-probe 181Hf.
Time-differential perturbed angular correlation study of the electric field gradient in Ti2Rh MoSi2-type compound.
Formation of DX-centers in indium doped CdTe.
Solution of 111In impurities in the Hf(Zr)3Al2 minority phases of Hf(Zr)4Al3 samples.
Characterization of ZnO and Zn0.95Co0.05O prepared by sol-gel method using PAC spectroscopy.
Temperature dependence of electric field gradient in TbCoO3.
Evolution under thermal annealing of Mn-doped iron disilicides obtained by ball milling.
The temperature dependence of the EFG for 172Lu(172Yb) in GaN.
First PAC experiments in MAX-phases.
High temperature perturbed angular correlation studies of Ln2NiO4+? Ln=La, Pr, Nd.
TDPAC study of Cd-doped SnO.
Investigation of hyperfine interactions in RMO3 (R =La, Nd; M =Cr, Fe) antiferromagnetic perovskite oxides using PAC spectroscopy.
First-principles study of location of Er3+ ion-Relationship to understanding of hyperfine interactions in the optoelectronic erbium-silicon system.
Stochastic models of hyperfine interactions in nonequilibrium: an examination of the XYZ model with a trapping-detrapping mechanism.
Electric field gradient at 12N implanted into ZnO.
Electronic structure of substitutional nitrogen impurity in TiO2 studied by the ?-NMR method.
Temperature dependence of Knight shifts for 12B in Pt.
Temperature dependence of the lattice locations of boron implanted in germanium.
Spin-lattice relaxation of 25Al and 28P in Pt.
Diffusion of 111Cd probes in Ga7Pt3 studied via nuclear quadrupole relaxation.
Lattice Dynamics, Ion-Solid Interactions.
High-temperature protonic motion and low-temperature lattice deformation in one-dimensional hydrogen-bonded molecular chain in tetramethylpyrazine-chloranilic acid (1?1).
BrNQR relaxation of the mixed-valence compound (NH4)4SbIIISbvBr12.
Mössbauer study of 57Fe in CVD diamond following 57Mn implantation.
Surfaces, Interfaces, Thin Films and Nano-Structures.
Theoretical modeling of bifunctional multilayer systems.
Hyperfine interactions in (CuFe2O4)1?x (SnO2) x (x=0, 1, 5, 10 and 20wt.%) nanocomposites studied by Mössbauer spectroscopy.
Study of the evolution of the hyperfine parameters in nanostructured Fe-Mn-Cu system.
Mössbauer study of Sn(Fe)02 prepared by mechanosynthesis.
Synthesis, thermal treatment and characterization of cobalt ferrite-based nanocomposites.
Local magnetic fields in the Mo layer of Mo/Fe multilayer.
The role of Fe during hydride formation in the Mg-Fe system: a Mössbauer investigation.
Perturbed angular correlation study of a nanostructured HfO2 film.
Dopants incorporation in ZnO mechanical milled powders sensed by positrons.
Mössbauer effect phase determination in iron oxide-polyaniline nanocomposites.
Nanostructures in calcia stabilized hafnia thin films observed by PAC as a function of temperature.
NMR study of the isotopically engineered Ge single crystals.
Zero-field splittings of NQR spectra for bismuth(III) oxy compounds revealed by quadrupole spin echo envelopes.
Nuclear spin echo model based on Floquet-Lyapunov theory.
35Cl NQR and XRD Studies on Cs2[Ag(I) x Au(I)1?x Cl2][Au(III)Cl4].
Novel pulsed electron spin resonance system and studies of phosphorus in natural silicon.
Nuclear Moments, Nuclear Polarizations, and Spin Dynamics.
Stimulated polarization wave process in spin 3/2 chains Springer Science + Business Media B.V. 2008.
Magnetic moment of proton halo nucleus 28P.
Production of spin-polarized 17N beam using inverse-kinematics low-energy transfer reactions.
g-Factors of magnetic-rotational states in 85Zr.
Hyperfine anomalies of Sc isotopes (A =44, 44 m, 46 and 47) in iron.
Electric quadrupole moments of neutron-rich nuclei 32Al and 31Al.
Hyperfine interaction of 25Al in ?-Al2O3 and its quadrupole moment.
Magnetic moment of short lived ?-emitter 24mAl.
?-Ray angular distribution from purely nuclear spin aligned 20F.
Magnetic moment of 48Sc.
Polarization of 23Ne, 24m,25Al and 28P produced through single nucleon pickup and charge-exchange reactions at 100 AMeV.
Investigations in Biology, Chemistry, and Medicine.
Using Mössbauer spectroscopy as key technique in the investigation of nanosized magnetic particles for drug delivery.
35Cl NQR spectra of group 1 and silver dichloromethanesulfonates.
New image contrast method in magnetic resonance imaging via ultrasound.
Quadrupole coupling constants and isomeric Mössbauer shifts for halogen-containing gold, platinum, niobium, tantalum and antimony compounds.
The DFT-DVM theoretical study of the differences of quadrupole splitting and the iron electronic structure for the rough heme models for ?- and ?-subunits in deoxyhemoglobin and for deoxymyoglobin.
A study of human liver ferritin and chicken liver and spleen using Mössbauer spectroscopy with high velocity resolution.
Ab initio study of the EFG at the N sites in imidazole.
Anomalous HID isotope effect on 35Cl NQR frequencies in piperidinium p-chlorobenzoate.
Measurement of electric field gradient at 117In on the Cu-site in mavicyanin by perturbed angular correlation of ?-rays.
Investigation of the hyperfine properties of deoxy hemoglobin based on its electronic structure obtained by Hartree-Fock-Roothaan procedure.
Theoretical investigation of nuclear quadrupole interactions in DNA at first-principles level.
35Cl NQR in glassy crystal, 3-chlorothiophene.
Study of 14N NQR response to SORC pulse sequence.
PAC research in biology.
New Directions and Developments in Methodology.
Laser pumping of ions in a cooler buncher.
Optical-coupling nuclear spin maser under highly stabilized low static field.
Cross-relaxation in multiple pulse NQR spin-locking.
Fitting PAC spectra with a hybrid algorithm.
Actual concepts of digital PAC-spectroscopy.
Development of atomic-beam resonance method to measure the nuclear moments of unstable nuclei.
Efficiency-optimized low-cost TDPAC spectrometer using a versatile routing/coincidence unit.
Hyperfine interactions: the past, the present and the future.
"Hyperfine interactions of half-metallic diluted antiferromagnetic semiconductors (p. 21-22)
Abstract Half-metallic diluted antiferromagnetic semiconductors (HM-AF-DMSs) are magnetic materials that are half-metallic and yet do not exhibit magnetization. The remarkable features of these materials and the possible experimental verifications for determining whether or not a material is a HM-AF-DMS by the detection of hyperfine interactions are discussed on the basis of the first-principles calculations of the electronic structure. Keywords Diluted magnetic semiconductor- Half-metal- Hyperfine field
Spin-electronics (or spintronics), which is a technology that employs the spin state of electrons and provides a new degree of freedom for storing information, is among the most challenging strategies in the development of electronic devices. One of the key issues in spintronics is half-metallicity, i.e., the property of metallicity in one spin state (say, spin-up) of electrons but insulating in the opposite spin state (spin-down). Although all the half-metals known thus far are ferromagnetic, half-metallicity is not restricted to ferromagnets.
The realization of half-metallic antiferromagnets (more precisely, half-metallic compensated ferrimagnets), which are half-metallic and yet do not exhibit magnetization, might be possible and these materials are expected to be used as a new type of spintronics materials. Since the past few years, several diluted ferromagnetic semiconductors (DMSs) have been theoretically designed (computational materials design). In these DMSs, local magnetic states are formed at the impurity bands that appear in a semiconductor gap. Similarly, half-metallic antiferromagnetic DMSs (HM-AF-DMSs) can be realized for the impurity bands in the gap.
We have proposed such a new type of half-metallic antiferromag
nets and named them half-metallic diluted antiferromagnetic semiconductors . In order to realize such systems, we have to introduce at least two different types of magnetic ions into nonmagnetic hosts . In DMSs that contains two types of magnetic ions among which the electron occupation of one type of ion is more than half-filling and that of the other is less than half-filling, the local magnetic moments of the two ions can be coupled anti-parallel to each other. In most cases, such an anti-parallel coupling is more stable than the parallel coupling and also exhibits half-metallicity.
Since half-metallic antiferromagnets do not exhibit magnetization, and moreover since they are disordered and diluted systems, it could be rather difficult to observe their chracterestics. In this study, we propose methods to verify whether or not a material is a half-metallic antiferromagnetic semiconductors. Magnetic circular dicroism (MCD) can be employed as one of the methods for detecting half-metallic antiferromagnetism. Another possible method for the verification of half-metallic antiferromagnetism is the detection of hyperfine interactions.
In order to employ the latter method, we have performed the first-principles calculations of the electronic structure and hyperfine fields of half-metallic antiferromagnetic semiconductors. Although several examples indicate that HM-AF materials might be stable, the fabrications of materials based on group II-VI compounds appear to be relatively easy. As an example of such semiconductors, we consider (Cdl-2xCrxFex)Te and discuss its hyperfine interactions."
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