Showing papers in "Journal of Physics and Chemistry of Solids in 1957"

TL;DR: The band structure of InSb is calculated using the k ·. p perturbation approach and assuming that the conduction and valence band extrema are at k = 0 as mentioned in this paper.

TL;DR: In this paper, it was shown that an effective mass which depends on the direction of the path through the saddle point in configuration space determines the Arrhenius expression's effective frequency.

TL;DR: In this paper, it was shown that these effects are connected with two kinds of instability of the uniform precessional motion of the total magnetization against certain spin-wave disturbances; these disturbances will grow, exponentially to begin with, when the signal level exceeds certain threshold values.

TL;DR: In this paper, the authors applied crystal field theory in conjunction with spectroscopic data to give quantitatively the d-shell splitting and the resulting stabilization of a transition metal ion in a crystal site of given symmetry.

TL;DR: In this paper, the distribution of transition-metal ions amongst octahedral and tetrahedral sites in oxides, particularly of the spinel type, is discussed from the viewpoint of crystal field theory.

TL;DR: In this paper, the distortions from cubic symmetry which occur in certain transition-metal oxides, particularly those with the spinel structure, are discussed in terms of crystal (ligand) field theory and it is shown that many such distortions, including all the large ones, are related in a simple fashion to the electronic configuration of the metal ion.

TL;DR: In this article, a number of compounds of V−B and VI−B elements, with chemical formula M 2 v − b N 3 vi − b been synthesized as single crystals of fairly good purity.

TL;DR: In this article, a new method is developed for calculating the distortion around point defects, which is entirely based on the discrete nature of the lattice and the main point is to adopt the normal co-ordinates expansion for displacements as in the dynamical theory.

TL;DR: In this article, the effects of electron scattering by acoustical and optical phonons as well as electron-hole scattering on the mobility and thermoelectric power of intrinsic InSb were investigated.

TL;DR: In this paper, a new explanation for the magnetic properties of superconducting alloys based on the theory of G inzburg and L andau was proposed, and the structure of the penetrating field is found for a superconductor and the relationship between induction and field strength.

TL;DR: In this paper, a neutron diffraction study has been carried out on the series of compounds LaBO 3 in which B is a trivalent ion of one of the 3-d transition group elements Cr, Mn, Fe, Co, and Ni.

TL;DR: In this paper, the electron spin resonance spectra were used to deduce the electronic structure of the self-trapped hole in the [110]-axes of the crystal.

TL;DR: A refinement of the crystal structure of yttrium-iron garnet (cubic space group Ia3d) has been carried out by application of the least-squares method of calculation to single-crystal X-ray data as mentioned in this paper.

TL;DR: In this article, a Doppelbande von CsJ-Kristallen is introduced, in which CsCI-Gitter-struktur is verknupft.

TL;DR: In this paper, it was shown that the vibrational amplitudes of hydrogen and deuterium are similar to those observed in other compounds, but the total neutron-scattering cross-section for hydrogen in this system is abnormally low, indicating that the protons are more nearly free than in the other hydrogen compounds.

TL;DR: In this paper, it was shown that the parabolic rate constant for the oxidation of metallic zinc may be calculated and the results were in good agreement with previous observations, and it may be that interstitial zinc is not involved in this process.

TL;DR: In this paper, an account is given of some magnetic measurements made on alloys of Cu containing from 0.03 to 11 atomic per cent Mn in the temperature range 2° to 400° K. All of these alloys obey a Curie-Weiss susceptibility law and show an electron spin resonance line with free spin g-value.

TL;DR: In this article, the preparation of the intermetallic compounds Bi2Te3, Sb2TE3, and As2Te2 from purified elements by several techniques is discussed and the advantages and disadvantages of various techniques are enumerated.

TL;DR: In this article, the magnetic moments of the manganese atoms on the two sublattices from single crystal investigations have been determined, and these experimental values satisfactorily explain the scattering from powdered samples at temperatures from 78°K to about 800°K.

TL;DR: In this article, the authors investigated the breakdown effect in germanium as a function of the temperature, magnetic field, background radiation, type and concentration of impurities, geometry, surface effects and the orientation of the specimens.

TL;DR: In this article, the authors put the conceptual description of R ose, which has been previously shown to have semiquantitative validity, is put on a more detailed quantitative basis.

TL;DR: In this paper, the dominant exchange interaction is not a direct M - M interaction, but a superexchange interaction via the metalloid atom, via the largest of the three angles M - X - M that occur for nearest neighbours M- X.

TL;DR: In this paper, it is suggested that the deformations may arise from strong negative B-B type interactions of the form Fe3+-Fe3+, Fe3 +-Cr3+ or Cr3++-cr3+ operating through super-exchange or semicovalent exchange mechanisms.

TL;DR: In this paper, the magnetization, resistivity and magnetoresistivity of dilute alloys of manganese in copper were investigated and it was inferred that within any volume of dimensions comparable to the electron mean free path the net magnetization in the virgin alloy is zero.

TL;DR: In this article, photoelectric emission from the valence band was investigated in the other alkali iodides and several other halides and concurrent measurements of reflectivity and optical absorption agree with Martienssen's recent results and show detail consistent with interband transitions.

TL;DR: In this paper, the authors compared the results obtained by application of the Born approximation to those obtained by applying the partial wave method and found that the Born-based approximation leads to incorrect results, the correct cross-sections being significantly less than the approximate results.

TL;DR: In this paper, it was shown that the change in T c produced by the impurities consists of two parts: the first part is due to the increase in residual resistance ratio, which is linearly proportional to an increase in the electronic mean free path.

TL;DR: In this article, the authors show that the conductivity of the conduction band deviates from Ohm's law at fields as low as 3 per cent of the threshold field for the breakdown generally ascribed to impact ionization.

TL;DR: The self-diffusion of both ions in potassium halides and alkali chlorides has been measured as a function of temperature Radioactive tracers were used, samples being obtained by slicing the specimen with a microtome for all temperatures and for all compounds except caesium chloride the diffusion constant for the cation exceeds that for the anion as mentioned in this paper.