Ground states of anisotropic antiferromagnets with single ion and cubic anisotropy
Anisotropic antiferromagnets in an external magnetic field show a rich variety of different ground states meeting in transition lines and multicritical points. We study the dependence of the ground states of these systems in the three dimensional space on physical parameters such as exchange, sing...
Збережено в:
| Дата: | 2009 |
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| Автори: | , |
| Формат: | Стаття |
| Мова: | English |
| Опубліковано: |
Інститут фізики конденсованих систем НАН України
2009
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/120549 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Ground states of anisotropic antiferromagnets with single ion and cubic anisotropy / T.-C. Dinh, R. Folk // Condensed Matter Physics. — 2009. — Т. 12, № 4. — С. 689-696. — Бібліогр.: 15 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | Anisotropic antiferromagnets in an external magnetic field show a rich variety of different ground states
meeting in transition lines and multicritical points. We study the dependence of the ground states of these
systems in the three dimensional space on physical parameters such as exchange, single ion and cubic
anisotropy. One identi es four different ground states: the paramagnetic (PM), the antiferromagnetic (AF), the
spin flop (SF) and the biconical (BC) ground state. In the case of absence of a cubic anisotropy, the transition
lines separating different ground states can be calculated analytically, otherwise they have to be calculated
numerically. We also considered the behavior of the staggered magnetization which characterizes the different
ground states. From its behavior the order of the transition from one state to the other is determined. But also
the order of the transition changes along the transition lines when including the cubic anisotropy, especially
at the reeentrant region where a transition from SF to BC and back to SF by increasing the external field
H occurs. Multicritical points are found which are assumed to be tricritical or critical endpoints. The results
obtained may be relevant for other systems since the antiferromagnetic model can be mapped to a lattice
gas model where the biconical ground state is interpreted as supersolid phase. Recent renormalization group
calculations show that such a phase would indicate the existence of a tetracritical point. |
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