Magnetic properties of a metal-organic antiferromagnet on a distorted honeycomb lattice

Abstract

For temperatures T well above the ordering temperature T*=3.0+-0.2K the magnetic properties of the metal-organic material Mn[C10H6(OH)(COO)]2x2H20 built from Mn^2+ ions and 3-hydroxy-2-naphthoic anions can be described by a S=5/2 quantum antiferromagnet on a distorted honeycomb lattice with two different nearest neighbor exchange couplings J2 \approx 2J1 \approx 1.8K. Measurements of the magnetization M(H,T) as a function of a uniform external field H and of the uniform zero field susceptibility χ(T) are explained within the framework of a modified spin-wave approach which takes into account the absence of a spontaneous staggered magnetization at finite temperatures.

arXiv comment11 pages, 11 figures; more thorough discussion of the dependence of the correlation length on the uniform magnetic field added

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• Quantum Phase Transition, O(3) Universality Class and Phase Diagram of Spin-1/2 Heisenberg Antiferromagnet on Distorted Honeycomb Lattice: A Tensor Renormalization Group Study
• Magnetic ground state and magnon-phonon interaction in multiferroic h-YMnO${}_3$
• Quantum Heisenberg antiferromagnets in a uniform magnetic field: nonanalytic magnetic field dependence of the magnon spectrum
• Elastic constants and ultrasonic attenuation in the cone state of the frustrated antiferromagnet Cs_2CuCl_4
• Easy-plane anisotropic-exchange magnets on a honeycomb lattice: quantum effects and dealing with them
• Entanglement and quantum correlations in the XX spin-$1/2$ honeycomb lattice
• Magnetic Catalysis in Antiferromagnetic Films
• Effective spin-wave action for ordered Heisenberg antiferromagnets in a magnetic field
• Square-Lattice Antiferromagnet Subjected to a Magnetic Field Aligned with the Order Parameter
• Demystifying quantum escapism on the honeycomb lattice