Browsing Physics by Date of Publication
Now showing items 1-20 of 2105
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Magnetization and Temperature Dependence of the Mossbauer Spectrum Shift for an Insulator.
(American Physical Society, 1969)The results of a Mossbauer-effect study of HoFeO3 in the temperature range 99-875?K are presented. Special attention is paid to the shift of the center of the spectrum and its temperature dependence both above and below ... -
Noncollinear spin arrangement in ultrafine ferrimagnetic crystallites
(American Physical Society, 1971)Mossbauer-effect measurements on extremely small (~60 ?) crystallites of ?-Fe2O3 show that the spin configuration differs from the Neel type found in large crystallites. It is proposed that the ions in the surface layer ... -
Mossbauer spectra of mixed crystals: diamagnetically - substituted yttrium iron garnet in the critical region
(American Physical Society, 1972)There is a range of temperature where the Mossbauer spectra of 57Fe3+ in diamagnetically substituted magnetically ordered iron oxides show broad lines and may be reproduced by local-molecular-field theory. The lines can ... -
Heat capacity of nichel sulfide and its semimetal-metal transition
(American Physical Society, 1974)Heat-capacity measurements have been made from 5 to 330 K on NiS which shows a nonmetal-metal transition at 265 K, and on Ni0.95S which is metallic at all temperatures. The low-temperature data yield electronic specific-heat ... -
Nickel sulfide - an itinerant electron antiferromagnet.
(American Physical Society, 1974)Antiferromagnetic nickel sulphide has a small temperature-independent magnetic susceptibility. The ordered moment per nickel atom, measured with neutrons, decreases from 1.45?B to 1.00?B at 4.2 K with a decrease of 0.6% ... -
Heat capacity and metal-insulator transition in Ti4O7 single crystals'
(American Physical Society, 1974)Heat-capacity and entropy changes at the metal-insulator transitions have been measured on Ti4O7 single crystals. The 130-K transition is related to a disordering of the Ti3+ and Ti4+ chains at the unit cell level. Ti3+ ... -
Magnetic structure of an amorphous rare-earth transition-metal alloy
(American Physical Society, 1976)161Dy Mossbauer spectra show that the dysprosium moments in amorphous DyCo3.4 are strongly coupled to the local crystal field axes. The magnetic structure is one in which the cobalt "sublattice" is strongly ferromagnetic, ... -
'Pulsed X-ray shadowgraphy of dense, cool, laser-imploded plasma
(American Physical Society, 1978)Laser implosion of 87-bar neon-filled glass microballoon targets produces a dense, cool plasma whose development in time and space is recorded by pulsed-x-ray shadowgraphy with soft x rays from a separate laser-produced ... -
Comparison between the amorphous and crystalline (A15) phases of Nb3Ge
(American Physical Society, 1978)A comparative study on the superconducting and the normal-state properties of the amorphous, low-Tc (3.9 K) and the crystalline, high-Tc (2.18 K) phases of Nb3Ge suggests that changes in the strength of electron-phonon ... -
Measurement of fast-electron energy spectra and preheating in laser-irradiated targets
(American Physical Society, 1979)Fast electrons produced by the irradiation of plane-layered targets with 20-J, 100-ps, 1015-W.cm-2, neodymium-laser pulses have been diagnosed by the K? emission which they cause at various depths in the targets. The ... -
The X-ray spectroscopic diagnosis of laser-produced plasmas, with emphasis on line broadening
(American Physical Society, 1980)A detailed account is given of the x-ray spectroscopic diagnosis of plasmas formed by exploding pusher microballoons. The measurements of the electron temperature from the shell and from the core is described. A method for ... -
Time-resolved X-ray spectroscopy of laser produced plasmas
(American Physical Society, 1980)X-ray emission spectra, produced by irradiation of neon-filled aluminum-coated glass microballoon and plane aluminum targets, with 100-ps Nd-glass laser pulses, have been time resolved with an x-ray streak camera. The time ... -
Numerical study of conductivity for the Anderson model in two and three dimensions
(1981)The equation-of-motion method is applied to the calculation of the conductivity for the Anderson model in two and three dimensions. The Kubo-Greenwood formula is evaluated by averaging suitable combinations of time-dependent ... -
Atomic coordination and the distribution of electric field gradients in amorphous solids
(American Physical Society, 1981)The observation of nuclear quadrupole interactions in amorphous solids provides a unique possibility of obtaining information about the angular distribution of local ionic coordinations, complementary to the information ... -
Charge-Transfer and Non-Rigid-Band Effects in the Graphite Compound LiC6
(1981)A comparison of angle-resolved photoemission energy distributions for pure graphite and the intercalation compound LiC6 show that considerable charge is transferred from Li to C, as expected; but the valence bands do not ... -
Silicon satellite spectra from laser imploded microballoons
(American Physical Society, 1981)The dielectronic satellite spectral lines, on the long-wavelength side of the hydrogenic Si XIV Lyman-? line, have been observed in the space-resolved spectra from laser-imploded glass microballoons. In the electron density ... -
Current trends in amorphous magnetism
(IEEE, 1984)Recent research on some topics in amorphous magnetism is reviewed and questions are posed which should be answered by future work. The topics are i) appearance of magnetism in binary alloys of the 3d transition elements ... -
Crystal Fields in Nd2Fe14B
(American Physical Society, 1984)The leading terms in the crystal field at both rare-earth sites in the new permanent magnet alloy Nd2Fe14B are B20 and B22s. The sign of B20 explains the variation of the anisotropy constant K1 reported by Sagawa et al. ... -
Computer generation of structural models of amorphous Si and Ge
(1985)We have developed and applied a computer algorithm that generates realistic random-network models of a-Si with periodic boundary conditions. These are the first models to have correlation functions that show no serious ... -
Near-infrared dye having a large ultrafast third-order susceptibility
(1986)Efficient degenerate four-wave mixing of 160-psec infrared light pulses at ? = 1.064 ?m in solutions of a new dye that absorbs between 1.0 and 1.6 ?m is reported. A Kerr-like third-order susceptibility of X(3)xyyx = 8 ? ...
