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 inter-cluster couplings to from 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 K2Cu3O(SO4)3: an EST cluster makes a triplet in the ground state and one-dimensional chain of the EST induces a cluster-based Haldane state. We predict that the cluster-based Haldene state emerges whenever the number of tetrahedra in the EST is even.
@article{arxiv.1709.06405,
title = {Cluster-based Haldane state in edge-shared tetrahedral spin-cluster chain: Fedotovite K$_2$Cu$_3$O(SO$_4$)$_3$},
author = {M. Fujihala and T. Sugimoto and T. Tohyama and S. Mitsuda and R. A. Mole and D. H. Yu and S. Yano and Y. Inagaki and H. Morodomi and T. Kawae and H. Sagayama and R. Kumai and Y. Murakami and K. Tomiyasu and A. Matsuo and K. Kindo},
journal= {arXiv preprint arXiv:1709.06405},
year = {2018}
}