The square-kagome quantum Heisenberg antiferromagnet at high magnetic fields: the localized-magnon paradigm and beyond
DOI (Low Temperature Physics):
https://doi.org/10.1063/1.4881184%20Ключові слова:
quantum Heisenberg antiferromagnet, square-kagome lattice, localized magnons, Berezinskii–Kosterlitz–Thouless transition.Анотація
We consider the spin-1/2 antiferromagnetic Heisenberg model on the two-dimensional square-kagome lattice with almost dispersionless lowest magnon band. For a general exchange coupling geometry we elaborate low-energy effective Hamiltonians which emerge at high magnetic fields. The effective model to describe the low-energy degrees of freedom of the initial frustrated quantum spin model is the (unfrustrated) square-lattice spin-1/2 XXZ model in a z-aligned magnetic field. For the effective model we perform quantum Monte Carlo simulations to discuss the low-temperature properties of the square-kagome quantum Heisenberg antiferromagnet at high magnetic fields. We pay special attention to a magnetic-field driven Berezinskii–Kosterlitz–Thouless phase transition which occurs at low temperatures.
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Опубліковано
2014-04-15
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Oleg Derzhko, Johannes Richter, Olesia Krupnitska, and Taras Krokhmalskii, The square-kagome quantum Heisenberg antiferromagnet at high magnetic fields: the localized-magnon paradigm and beyond, Low Temp. Phys. 40, (2014) [Fiz. Nizk. Temp. 40, 662-670, (2014)] DOI: https://doi.org/10.1063/1.4881184 .
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Низькотемпературний магнетизм
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