Spin dynamics and 1/3 magnetization plateau in a coupled distorted diamond chain compound K2Cu3(MoO4)4

Abstract

We investigate magnetic properties of the $s$ = 1/2 compound K${}_2$Cu${}_3$(MoO${}_4$)${}_4$ by combining magnetic susceptibility, magnetization, specific heat, and electron spin resonance (ESR) with density functional calculations. Its monoclinic structure features alternating Cu${}^{2+}$ ($s$ = 1/2) monomers and edge-shared dimers linked by MoO${}_4$ units, forming a distorted diamond chain along the $a$-axis. Antiferromagnetic order occurs at $T_{\mathrm{N}}$ = 2.3 K, as evident from a $\lambda$-type anomaly in specific heat and magnetic susceptibility derivatives. Inverse magnetic susceptibility reveals coexisting ferro- and antiferromagnetic interactions. Specific heat and ESR data show two characteristic temperatures: one at 20 K, associated with spin-singlet formation in Cu${}_2$O${}_9$ dimers, and another at 3.68 K, indicating short-range correlations between dimers and monomers. Magnetization measurements reveal a metamagnetic transition at 2.6 T and a critical magnetic field ${\mu }_0{H}_c$ = 3.4 T, where a 1/3 magnetization plateau emerges with saturation near 0.35 ${\mu }_{\mathrm{B}}$. Low-temperature specific heat and magnetization data reveal the suppression of long-range order at ${\mu }_0{H}_c$, enabling the construction of a temperature-magnetic field phase diagram showing multiple magnetic phases near the ${\mu }_0{H}_c$. Density functional theory confirms a distorted diamond chain with $J_1$ dimers and competing $J_2$, $J_4$, $J_3$, and $J_5$ interactions with monomer spins as an effective low-temperature spin model.

References in corpus (26)

• Quantum Spin Liquids
• Quantum Spin Liquid States
• Quantum Spin Liquids
• Quantum Criticality: competing ground states in low dimensions
• Quantum criticality and universal scaling of a quantum antiferromagnet
• Dimensional reduction at a quantum critical point
• Electron Spin Resonance in S=1/2 antiferromagnetic chains
• Multi-step approach to microscopic models for frustrated quantum magnets - the case of the natural mineral azurite
• Nature of the spin dynamics and 1/3 magnetization plateau in azurite
• Pinwheel VBS state and triplet excitations in the two-dimensional deformed kagome lattice
• Tomonaga-Luttinger Liquid Behavior and Spinon Confinement in YbAlO${}_3$
• Experimental signatures of quantum and topological states in frustrated magnetism
• Dispersions of Many-Body Bethe strings
• The magnetic and crystal structure of azurite Cu${}_3$(CO${}_3$)${}_2$(OH)${}_2$ as determined by neutron diffraction
• Development of short and long-range magnetic order in the double perovskite based frustrated triangular lattice antiferromagnet Ba2MnTeO6
• Spin Configuration in the 1/3 Magnetization Plateau of Azurite Determined by NMR
• Dynamics of the Distorted Diamond Chain
• Signature of a randomness-driven spin-liquid state in a frustrated magnet
• Quasi-one-dimensional magnetism in the spin-$\frac{1}{2}$ antiferromagnet BaNa${}_2$Cu(VO${}_4$)${}_2$
• The dynamics of azurite Cu${}_3$(CO${}_3$)${}_2$(OH)${}_2$ in a magnetic field as determined by neutron scattering
• Quantum criticality in the coupled two-leg spin ladder Ba2CuTeO6
• Magnetoelastic and structural properties of azurite Cu3(CO3)2(OH)2 from neutron scattering and muon spin rotation
• Antiferromagnetism of Ni2NbBO6 with S = 1 dimer quasi-one-dimensional armchair chains
• Effects of Single-site Anisotropy on Mixed Diamond Chains with Spins 1 and 1/2
• Magnetism and field-induced effects in the S = 5/2 honeycomb lattice antiferromagnet FeP3SiO11
• Magnetization Plateau of the Distorted Diamond Spin Chain with Anisotropic Ferromagnetic Interaction

Cited by in corpus (3)

• Macroscopic ground state degeneracy of the ferro-antiferromagnetic Heisenberg model on diamond-decorated lattices
• Phase diagram and macroscopic ground state degeneracy of frustrated spin-1/2 anisotropic Heisenberg model on diamond-decorated lattices
• Multistage spin correlations in the $s$ = 1/2 stuffed hyper-star lattice Li${}_2$Cu${}_2$(MoO${}_4$)${}_3$