Magnetic Properties of One-Dimensional Quantum Spin System Rb2Cu2Mo3O12 Studied by Muon Spin Relaxation

Abstract

Magnetic properties of a one-dimensional frustrated quantum spin system Rb2Cu2Mo3O12 is investigated by the muon spin relaxation (muSR) technique. Although this system shows an incommensurate spin correlation in neutron scattering, it has not yet been determined whether the ground state reaches to a nonmagnetic spin-singlet state or not. In this study, our zero-field (ZF) muSR result undoubtedly reveals a nonmagnetic ground state, which establishes formation of the nonmagnetic incommensurate spin-singlet state in combination of the previous neutron scattering study. Furthermore, we found that the internal field is slightly enhanced below ~7 K. This temperature dependence resembles that of electric polarization under the magnetic field reported recently, indicating a possibility that a small change occurs even under ZF. In longitudinal-field measurements, a fast fluctuation around a narrowing region is observed. This relaxation is expected to reflect characteristics of formation of the spin-singlet state.

arXiv comment5 pages, 3 figures, to be published in J. Phys. Soc. Jpn.: Conf. Proc

References in corpus (3)

• Spin current and magneto-electric effect in non-collinear magnets
• Confirmation of a one-dimensional spin-1/2 Heisenberg system with ferromagnetic first-nearest-neighbor and antiferromagnetic second-nearest-neighbor interactions in Rb${}_2$Cu${}_2$Mo${}_3$O${}_{12}$
• Structural and magnetic properties of the 5$d^2$ double perovskites Sr${}_{2}B$ReO${}_6$ ($B$ $=$ Y, In)

Cited by in corpus (3)

• One- and three-dimensional quantum phase transitions and anisotropy in Rb${}_2$Cu${}_2$Mo${}_3$O${}_{12}$
• Emergent spin-$1$ Haldane gap and ferroelectricity in a frustrated spin-$1/2$ ladder
• Critical dielectric susceptibility at a magnetic BEC quantum critical point