ISSN:
1432-0630
Keywords:
Positron annihilation
;
Ionic crystals
;
Electronic structure
;
Magnetic materials
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract Measurements are reported of the angular correlation of annihilation radiation from polarized positrons in single crystals of Fe3O4. No change has been found in the angular correlations on passing through the metal-nonmetal phase transition. The twophoton momentum distribution, obtained by deconvolution of a set of angular correlations, displays a slight anisotropy. The spin density consists of a negative peak at zero momentum surrounded by a shell of positive density between 2 and 5 mrad. The observed spin density is probably a mixture of contributions from the moment on the ferrous ions and from the spin transfer onto the anions owing to covalency effects.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00928383
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