Electronic structure and magnetic properties of the strong-rung spin-1 ladder compound Rb3Ni2(NO3)(7)

Article

关键词: SINGLE-MOLECULE MAGNETS;    CORRELATED SYSTEMS;    HALDANE-GAP;    FIELD;    COMPLEXES;    RESONANCE;    NENP;    INSULATORS;    SOFTWARE;    NINO;   

DOI  :  10.1103/PhysRevB.97.144420

来源: SCIE

【 摘 要 】

Rb3Ni2(NO3)(7) was obtained by crystallization from anhydrous nitric acid solution of rubidium nitrate and nickel nitrate hexahydrate. The crystal structure determined on single crystals implies isolated spin-1 two-leg ladders of Ni2+ ions connected by (NO3)(-) groups as basic elements. Magnetic susceptibility, specific heat in magnetic fields up to 9 T, magnetization, and high-frequency electron spin resonance studies performed on powder samples show the absence of long-range magnetic order at T >= 2 K. Electronic structure calculations and the detailed analysis of the experimental data enable quantitative estimates of the relevant parameters of the S = 1 ladders in Rb3Ni2(NO3)(7). The rung coupling J(1) = 10.16 K, the leg coupling J(2) = 1.5 K, and the Ising-type anisotropy vertical bar A vertical bar = 8.6 K are obtained. The scenario of a valence-bond solidlike quantum ground state realized in the two-leg Ni2+ ladders is further corroborated by model simulations of the magnetic susceptibility.

【 授权许可】

Free