We study the effects of quenched disorder in a class of quantum chains with (p+ 1)-multispin
interactions exhibiting a free fermionic spectrum, paying special attention to the case p= 2 …

We study a one-dimensional spin-1/2 model with three-spin interactions and a transverse
magnetic field h. The model is known to have a Z 2× Z 2 symmetry and a duality between h …

This work presents the remarkable experimental magnetocaloric properties of the
perovskites Pr 0.9 Sr 0.1 Mn 0. 9 3+ Mn 0. 1 4+ O 3, including the magnetic entropy change …

Experimental data obtained with the perovskite compounds Pr 0.55 Sr 0.45 MnO 3 show that
the magnetization decreases with increasing temperature T and undergoes a very sharp …

Recently multiple families of spin chain models were found, which have a free fermionic
spectrum, even though they are not solvable by a Jordan-Wigner transformation. Instead, the …

In this article we outline the historical development and key results obtained to date for free
parafermionic spin chains. The concept of free parafermions provides a natural N-state …

We calculate the spectral properties of two related families of non-Hermitian free-particle
quantum chains with N-multispin interactions (N= 2, 3,...). The first family have a Z (N) …

The one-dimensional (1D) Ising model is revisited. The integral operator method is used for
the model to derive the general statistical identity for multispin correlation functions. As an …

We show by extensive Monte Carlo simulations that we need a multi-spin interaction in
addition to pairwise interactions in order to reproduce the temperature dependence of the …

We show that a quantum spin system has an exact free-parafermion solution if its frustration
graph is an oriented indifference graph. Further, we show that if the frustration graph of a …