Magnetocaloric effect in quantum spin-s chains
We compute the entropy of antiferromagnetic quantum spin-s chains in an external magnetic field using exact diagonalization and Quantum Monte Carlo simulations. The magnetocaloric effect, i. e., temperature variations during adiabatic field changes, can be derived from the isentropes. First, we fo...
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/123456789/119996 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Magnetocaloric effect in quantum spin-s chains / A. Honecker, S. Wessel // Condensed Matter Physics. — 2009. — Т. 12, № 3. — С. 399-410. — Бібліогр.: 55 назв. — англ. |
Репозиторії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| Резюме: | We compute the entropy of antiferromagnetic quantum spin-s chains in an external magnetic field using exact
diagonalization and Quantum Monte Carlo simulations. The magnetocaloric effect, i. e., temperature variations
during adiabatic field changes, can be derived from the isentropes. First, we focus on the example of the spin-
s = 1 chain and show that one can cool by closing the Haldane gap with a magnetic field. We then move to
quantum spin-s chains and demonstrate linear scaling with s close to the saturation field.
In passing, we propose a new method to compute many low-lying excited states using the Lanczos recursion. |
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