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Information × Registration Number 0225U000425, (0123U103181) , R & D reports Title Frustrated quantum magnets at finite temperatures popup.stage_title Дослідження динаміки і термодинаміки S=½ квантової моделі Гайзенберга на гратці “кленовий лист” методом ротаційно–інваріантних функцій Гріна і методом ентропії; дослідження динаміки і термодинаміки S=½ квантової моделі Гайзенберга на гратці квадратне кагоме методом ротаційно–інваріантних функцій Гріна і методом ентропії. Head Hutak Taras I., Доктор філософії Registration Date 11-01-2025 Organization Institute of Condensed Matter Physics of the National Academy of Sciences of Ukraine popup.description1 We will study the effects of geometrical frustration at finite temperatures. We will use rotationally-invariant Green's function, high-temperature expansion, and entropy method to study Heisenberg antiferromagnets on geometrically frustrated lattices of different dimensionality. Obtained results for thermodynamic and dynamic properties will be used to interpret experimental data. popup.description2 We studied the thermodynamics of geometrically frustrated magnets in different space dimensions. Using high-temperature expansion up to 16th order with the implication of the entropy method, specific heat and uniform susceptibility of S=½ antiferromagnetic Heisenberg model on hyperkagome and "maple-leaf" lattices were studied. We studied the thermodynamics of the fully frustrated kagome bilayer in strong magnetic fields. The low-temperature behavior of this system is related to the lattice gas of hard rhombies. We also obtained Green's function in the Kondo-Yamaji decoupling for the J1-J2-J3-Jx antiferromagnetic Heisenberg model on a square kagome lattice. Product Description popup.authors popup.nrat_date 2025-01-11 Close