Inducing critical phenomena in spin chains through sparse alternating fields
Inducing critical phenomena in spin chains through sparse alternating fields
We analyze the phase diagram of the exact ground state (GS) of spin-$s$ chains with ferromagnetic XXZ couplings under $n$-alternating field configurations, i.e., sparse alternating fields having nodes at $n\ensuremath{-}1$ contiguous sites. It is shown that such systems can exhibit a nontrivial magnetic behavior, which can differ significantly from that …