Fujihala M, Sugimoto T, Tohyama T, Mitsuda S, Mole R A, Yu D H, Yano S, Inagaki Y, Morodomi H, Kawae T, Sagayama H, Kumai R, Murakami Y, Tomiyasu K, Matsuo A, Kindo K
Department of Physics, Faculty of Science, Tokyo University of Science, Shinjuku, Tokyo 162-8601, Japan.
Department of Applied Physics, Faculty of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan.
Phys Rev Lett. 2018 Feb 16;120(7):077201. doi: 10.1103/PhysRevLett.120.077201.
Fedotovite K_{2}Cu_{3}O(SO_{4}){3} is a candidate of new quantum spin systems, in which the edge-shared tetrahedral (EST) spin clusters consisting of Cu^{2+} 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≅4 K. Rigorous theoretical studies provide an insight into the magnetic state of K{2}Cu_{3}O(SO_{4})_{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.
费多托夫矿K₂Cu₃O(SO₄)₃是新型量子自旋系统的候选物，其中由Cu²⁺组成的边共享四面体（EST）自旋簇通过弱簇间耦合相连，形成一维阵列。通过磁化率、磁化强度、热容量和非弹性中子散射测量进行的综合实验研究表明，在T≅4 K以下存在有效的S = 1的霍尔丹态。严格的理论研究深入了解了K₂Cu₃O(SO₄)₃的磁态：一个EST簇在基态形成一个三重态，而EST的一维链诱导出基于簇的霍尔丹态。我们预测，只要EST中的四面体数量为偶数，就会出现基于簇的霍尔丹态。
