| Numéro |
J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
|
|
|---|---|---|
| Page(s) | C8-1417 - C8-1418 | |
| DOI | https://doi.org/10.1051/jphyscol:19888651 | |
Proceedings of the International Conference on Magnetism
J. Phys. Colloques 49 (1988) C8-1417-C8-1418
DOI: 10.1051/jphyscol:19888651
1 Istituto di Fisica dell'Università di Siena, 53100 Siena, ed Unità del GNSM-CISM, 50125 Firenze, Italy
2 Istituto Elettronica Quantistica CNR, 50127 Firenze, Italy
J. Phys. Colloques 49 (1988) C8-1417-C8-1418
DOI: 10.1051/jphyscol:19888651
EFFECT OF A FIELD ON THE THERMODYNAMICS OF THE RANDOMLY DILUTE 1D HEISENBERG FERROMAGNET
A. Rettori1 et M. G. Pini21 Istituto di Fisica dell'Università di Siena, 53100 Siena, ed Unità del GNSM-CISM, 50125 Firenze, Italy
2 Istituto Elettronica Quantistica CNR, 50127 Firenze, Italy
Abstract
The thermodynamics of the dilute 1D Heisenberg ferromagnet in a field is investigated. The quantum free spin-wave theory is used to calculate the specific heat and analytical results are obtained for low temperatures and low concentration of impurities. The bulk, surface and size contributions to the free energy are evaluated by the classical transfer matrix method and analytical results for the surface one are given at low and high temperatures.