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

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

2005-05-17

arxiv.org/abs/cond-mat/0505425v2

Phys. Rev. B 72, 174429 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.72.174429

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 \chi(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.

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