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Abstract
K3Cu3AlO2(SO4)4 is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Spinon continuum and spin-singlet dimer excitations are observed in the inelastic neutron scattering spectra, which is in excellent agreement with a theoretical prediction: a dimer-monomer composite structure, where the dimer is caused by strong antiferromagnetic (AFM) coupling and the monomer forms an almost isolated quantum AFM chain controlling low-energy excitations. Moreover, muon spin rotation/relaxation spectroscopy shows no long-range ordering down to 90 mK, which is roughly three orders of magnitude lower than the exchange interaction of the quantum AFM chain. K3Cu3AlO2(SO4)4 is, thus, regarded as a compound that exhibits a Tomonaga-Luttinger spin liquid behavior at low temperatures close to the ground state.
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Details
1 Tokyo University of Science, Department of Physics, Tokyo, Japan
2 Tokyo University of Science, Department of Applied Physics, Tokyo, Japan
3 Tohoku University, Department of Physics, Sendai, Japan
4 High Energy Accelerator Research Organization, Muon Science Laboratory and Condensed Matter Research Center, Institute of Materials Structure Science, Tsukuba, Japan
5 High Energy Accelerator Research Organization, Neutron Science Division, Institute of Materials Structure Science, Tsukuba, Japan
6 Tokyo University of Science, Department of Chemistry, Tokyo, Japan
7 High Energy Accelerator Research Organization, Photon Factory, Institute of Materials Structure Science, Tsukuba, Japan