MAGNETIC PROPERTIES OF THE TWO-LEG ZIG-ZAG LADDER IN QUANTUM SPIN SYSTEM NH4CuCl3

Teguh Yoga Raksa (Jurusan Fisika, FMIPA, Universitas Indonesia, Depok 16424)
Budhy Kurniawan (Jurusan Fisika, FMIPA, Universitas Indonesia, Depok 16424)

Jurnal Sains Materi Indonesia
Vol 3, No 2: FEBRUARI 2002

MAGNETIC PROPERTIES OF THE TWO-LEG ZIG-ZAG LADDER IN QUANTUM SPIN SYSTEM NH4CuCl3. Numerical analysis of the two-leg zig-zag ladder as a single chain with next-nearest neighbour interactions has been formulated by Cabra (1999) with the following Hamiltonian: Other formulation for two leg zig-zag ladder with dimmerized chains and coupling between the chains is as follow : From these formulations, we study the closing of the gap at zero magnetization by means of the fine—tuning mechanism and disappreance of the 1/2 plateau (gap) at finite by alternating dimerization of the chains along the rungs. We also described NH4CuCl3 under high magnetic fields in a two-leg system.