Tomonaga-Luttinger spin liquid in the spin-1/2 inequilateral diamond-chain compound K\(_3\)Cu\(_3\)AlO\(_2\)(SO\(_4\))\(_4\)

K\(_3\)Cu\(_3\)AlO\(_2\)(SO\(_4\))\(_4\) 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 di...

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Published inarXiv.org
Main Authors Fujihala, M, Koorikawa, H, Mitsuda, S, Morita, K, Tohyama, T, Tomiyasu, K, Koda, A, Okabe, H, Itoh, S, Yokoo, T, Ibuka, S, Tadokoro, M, Itoh, M, Sagayama, H, Kumai, R, Murakami, Y, Nakamura, D
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 14.07.2017
Subjects
Antiferromagnetism
Chains
Composite structures
Copper
Diamonds
Dimers
Excitation
Inelastic scattering
Molecular structure
Monomers
Muon spin relaxation
Muon spin rotation
Neutron scattering
Neutrons
Spectrum analysis
Spin liquid
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Summary:K\(_3\)Cu\(_3\)AlO\(_2\)(SO\(_4\))\(_4\) 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. K\(_3\)Cu\(_3\)AlO\(_2\)(SO\(_4\))\(_4\) is, thus, regarded as a compound that exhibits a Tomonaga-Luttinger spin liquid behavior at low temperatures close to the ground state.
ISSN:2331-8422
DOI:10.48550/arxiv.1705.01158