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Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K3Cu3AlO2(SO4)4.

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.

SUBMITTER: Fujihala M 

PROVIDER: S-EPMC5711793 | biostudies-other | 2017 Dec

REPOSITORIES: biostudies-other

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Possible Tomonaga-Luttinger spin liquid state in the spin-1/2 inequilateral diamond-chain compound K<sub>3</sub>Cu<sub>3</sub>AlO<sub>2</sub>(SO<sub>4</sub>)<sub>4</sub>.

Fujihala Masayoshi M   Koorikawa Hiroko H   Mitsuda Setsuo S   Morita Katsuhiro K   Tohyama Takami T   Tomiyasu Keisuke K   Koda Akihiro A   Okabe Hirotaka H   Itoh Shinichi S   Yokoo Tetsuya T   Ibuka Soshi S   Tadokoro Makoto M   Itoh Masaki M   Sagayama Hajime H   Kumai Reiji R   Murakami Youichi Y  

Scientific reports 20171201 1

K<sub>3</sub>Cu<sub>3</sub>AlO<sub>2</sub>(SO<sub>4</sub>)<sub>4</sub> 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 controlli  ...[more]

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