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Surface effect on the Morin transition of α-Fe2O3 particles coated with surfactant (1994)

Kumar, L. ; Fan, Y. Z. ; Hu, B. Y. ; [weitere]

Springer

Hyperfine interactions 84 (1994), S. 137-141

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ISSN: 1572-9540

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Uniform hematite particles with an average size of 400 Å were prepared for reducing the influence of the particle-size distribution on the measurement of the Morin temperature. A series of Mössbauer spectra at different temperatures have been recorded. The Morin transition occurs at 216 K for sample B coated with a surfactant-oleic acid, and it occurs at 192 K for uncoated sample A. The temperature intervals in the region of the spin flip are almost the same for both samples. These results show that aT m shift could arise from surface effects such as spin pinning directly induced by a surfactant, and that the distortion produces restriction not only on the top few layers, but also on the whole volume of the particle.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02060654

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Digitale Medien

Shell-structure and octupole instability in fermion systems (1991)

Hamamoto, I. ; Mottelson, B. ; Xie, H. ; [weitere]

Springer

The European physical journal 21 (1991), S. 163-175

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ISSN: 1434-6079

Schlagwort(e): 03.65. ; 36.40.+d ; 21.60.-n

Quelle: Springer Online Journal Archives 1860-2000

Thema: Physik

Notizen: Abstract Simulating the one-particle spectra of the infinite-well potential by a model, we study the symmetry and the shell-structure of octupole deformations as well as the possible occurrence of octupole (and quadrupole) instabilities. Among various types of octupole deformations investigated theY 32-type deformation is found to have a strong shell-structure as well as a very interesting symmetry which leads to the occurrence of highly-degenerate single-particle levels. One particle spectra of the octupole-coupled two-level model (withl andl + 3) are analytically studied in the limit of large angular-momentum,l.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01425595

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