Spin-coupling topology in the copper hexamer compounds A(2)Cu(3)O(SO4)(3) (A=Na, K)

Article

关键词: BULK MAGNETIC-PROPERTIES;    QUANTUM MAGNETISM;    CRYSTAL-STRUCTURE;    ENERGY-LEVELS;   

DOI  :  10.1103/PhysRevB.101.224417

来源: SCIE

【 摘 要 】

The compounds A(2)Cu(3)O(SO4)(3) (A = Na, K) are characterized by copper hexamers that are weakly coupled to realize antiferromagnetic order below T-N approximate to 3 K. They constitute quantum spin systems with S = 1 triplet ground states. We investigated the energy-level splittings of the copper hexamers by inelastic neutron scattering experiments covering the entire range of the magnetic excitation spectra. The observed transitions are governed by very unusual selection rules that we ascribe to the underlying spin-coupling topology. This is rationalized by model calculations that allow an unambiguous interpretation of the magnetic excitations concerning both the peak assignments and the nature of the spin-coupling parameters.

【 授权许可】

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