期刊
PHYSICAL REVIEW LETTERS
卷 120, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.077201
关键词
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资金
- Post 'K' Computer, MEXT, Japan
- MEXT, Japan [17K14344, 16K17753, JP17H06137, JP15H03692]
- Grants-in-Aid for Scientific Research [17K14344, 15H03692, 16K17753, 17H06137] Funding Source: KAKEN
Fedotovite K2Cu3O(SO4)(3) is a candidate of new quantum spin systems, in which the edge-shared tetrahedral ( EST) spin clusters consisting of Cu2+ are connected by weak intercluster couplings forming a one-dimensional array. Comprehensive experimental studies by magnetic susceptibility, magnetization, heat capacity, and inelastic neutron scattering measurements reveal the presence of an effective S = 1 Haldane state below T congruent to 4 K. Rigorous theoretical studies provide an insight into the magnetic state of K2Cu3O(SO4)(3) : an EST cluster makes a triplet in the ground state and a one-dimensional chain of the EST induces a cluster-based Haldane state. We predict that the cluster-based Haldane state emerges whenever the number of tetrahedra in the EST is even.
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