Effective low-energy description of almost Ising-Heisenberg diamond chain
Effective low-energy description of almost Ising-Heisenberg diamond chain
We consider a geometrically frustrated spin-1/2 Ising-Heisenberg diamond chain, which is an exactly solvable model when assuming part of the exchange interactions as Heisenberg ones and another part as Ising ones. A small $XY$ part is afterwards perturbatively added to the Ising couplings, which enabled us to derive an effective …