Автор |
J Als-Nielsen |
Автор |
S T Bramwell |
Автор |
M T Hutchings |
Автор |
G J McIntyre |
Автор |
D Visser |
Дата выпуска |
1993-10-18 |
dc.description |
We have investigated the static zero-field critical properties of the ionic ferromagnet Rb<sub>2</sub>CrCl<sub>4</sub>, using neutron scattering, under conditions such that the quasi-static approximation is valid. A general consideration of the spin Hamiltonian of Rb<sub>2</sub>CrCl<sub>4</sub>, with S = 2, shows that it approximates the two-dimensional (2D) XY model, with additional weak perturbations. Rb<sub>2</sub>CrCl<sub>4</sub> orders three dimensionally at T<sub>c</sub> = 52.3 K, and very close to T<sub>c</sub> there is a regime of three-dimensional critical behaviour. However, both below and above T<sub>c</sub> there is a crossover to regimes of two-dimensional critical fluctuations. In these regimes, there is excellent agreement between experiment and theoretical predictions for a finite-sized 2D XY model, suggesting that Rb<sub>2</sub>CrCl<sub>4</sub> is an ideal realization of this system. |
Формат |
application.pdf |
Издатель |
Institute of Physics Publishing |
Название |
Neutron scattering investigation of the static critical properties of Rb<sub>2</sub>CrCl<sub>4</sub> |
Тип |
paper |
DOI |
10.1088/0953-8984/5/42/009 |
Electronic ISSN |
1361-648X |
Print ISSN |
0953-8984 |
Журнал |
Journal of Physics: Condensed Matter |
Том |
5 |
Первая страница |
7871 |
Последняя страница |
7892 |
Аффилиация |
J Als-Nielsen; Riso Nat. Lab., Roskilde, Denmark |
Аффилиация |
S T Bramwell; Riso Nat. Lab., Roskilde, Denmark |
Аффилиация |
M T Hutchings; Riso Nat. Lab., Roskilde, Denmark |
Аффилиация |
G J McIntyre; Riso Nat. Lab., Roskilde, Denmark |
Аффилиация |
D Visser; Riso Nat. Lab., Roskilde, Denmark |
Выпуск |
42 |