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.
Highlights
K3Cu3AlO2(SO4)[4] is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet
A recent theoretical approach based on density functional theory together with numerical many-body calculations has proposed a microscopic model for the azurite, which includes two energy scales coming from singlet dimer and 1D Heisenberg chain[7]
We present detailed studies of K3Cu3AlO2(SO4)[4] through single-crystal and powder X-ray diffraction (XRD), inelastic neutron scattering (INS), and muon spin rotation/relaxation spectroscopy
Summary
K3Cu3AlO2(SO4)[4] is a highly one-dimensional spin-1/2 inequilateral diamond-chain antiferromagnet. Azurite Cu3(CO3)2(OH)[2] that contains spin-1/2 distorted diamond chains[1,2,3,4] is a possible candidate for the TL spin liquid, since the ground state of the distorted diamond-chain is expected to belong to an alternating dimer-monomer phase where neighboring monomers are connected via the dimer in between and an effective Heisenberg 1D chain controls low-energy excitations[5,6]. We present detailed studies of K3Cu3AlO2(SO4)[4] through single-crystal and powder X-ray diffraction (XRD), inelastic neutron scattering (INS), and muon spin rotation/relaxation (μSR) spectroscopy. These experimental results indicate that K3Cu3AlO2(SO4)[4] is an appropriate model material for the investigation of the TL spin liquid state at low temperatures close to the ground state
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