Model for spin coupling disorder effects on the susceptibility of antiferromagnetic nanochains

Details Model for spin coupling disorder effects on the susceptibility of antiferromagnetic nanochains Model for spin coupling disorder effects on the susceptibility of antiferromagnetic nanochains

2009-01-27

arxiv.org/abs/0901.4317v2

Applied Physics Letters 94,032505,2009

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 3 figures

Scientific paper

10.1063/1.3072361

The temperature dependence of the static magnetic susceptibility of exchange-disordered antiferromagnetic Heisenberg spin-1/2 finite chains with an odd number of spins is investigated as a function of size and type of disorder in the exchange coupling. Two models for the exchange disorder distribution are considered. At sufficiently low temperatures each chain behaves like an isolated spin-1/2 particle. As the size of the chains increases, this analogy is lost and the chains evolve into the thermodynamic limit behavior. The present study provides a simple criterion, based on susceptibility measurements, to establish when odd-sized chains effectively simulate a single spin-1/2 particle.

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