期刊
PHYSICAL REVIEW B
卷 104, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.144402
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资金
- Deutsche Forschungsgemeinschaft [247310070]
The study used inelastic neutron scattering technique to investigate the magnetic Hamiltonian of the Heisenberg quantum antiferromagnet SrCuTe2O6. Different behaviors were observed above and below the magnetic transition temperatures, revealing a unique one-dimensional nature of the material. The results suggest that SrCuTe2O6 has a highly one-dimensional Heisenberg system with complex coupling interactions, presenting a scenario different from other related materials.
The magnetic Hamiltonian of the Heisenberg quantum antiferromagnet SrCuTe2O6 is studied by inelastic neutron scattering technique on powder and single-crystalline samples above and below the magnetic transition temperatures at 8 and 2 K. The high-temperature spectra reveal a characteristic diffuse scattering corresponding to a multispinon continuum, confirming the dominant quantum spin chain behavior due to the third neighbor interaction J(intra) = 4.22 meV (49 K). The low-temperature spectra exhibit sharper excitations at energies <1.25 meV, which can be explained by considering a combination of weak antiferromagnetic first nearest neighbor interchain coupling J(1) = 0.17 meV (1.9 K) and even weaker ferromagnetic second nearest neighbor J(2) = -0.037 meV (-0.4 K) or a weak ferromagnetic J(2) = -0.11 meV (-1.3 K) and antiferromagnetic J(6) = 0.16 meV (1.85 K), giving rise to the long-range magnetic order and spin-wave excitations at low energies. These results suggest that SrCuTe2O6 is a highly one-dimensional Heisenberg system with three mutually perpendicular spin chains coupled by a weak ferromagnetic J(2) in addition to the antiferromagnetic J(1) or J(6), presenting a contrasting scenario from the highly frustrated hyper-hyperkagome lattice (equally strong antiferromagnetic J(1) and J(2)) found in the isostructural quantum spin liquid candidate PbCuTe2O6.
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