Exactly solved mixed spin-(1,1/2) Ising-Heisenberg distorted diamond chain

TL;DR

This paper provides an exact solution for a mixed spin-(1,1/2) Ising-Heisenberg distorted diamond chain, analyzing how geometric frustration and distortion affect its magnetic and thermal properties.

Contribution

It introduces an exact analytical approach to study the ground state and thermodynamic behavior of the distorted diamond chain with mixed spins.

Findings

Zero-temperature magnetization exhibits intermediate plateaus at 0 and 0.5 of saturation.

Specific heat shows multiple peaks depending on temperature and magnetic field.

Geometric frustration and distortion significantly influence magnetic and thermal responses.

Abstract

The mixed spin-(1,1/2) Ising-Heisenberg model on a distorted diamond chain with the spin-1 nodal atoms and the spin-1/2 interstitial atoms is exactly solved by the transfer-matrix method. An influence of the geometric spin frustration and the parallelogram distortion on the ground state, magnetization, susceptibility and specific heat of the mixed-spin Ising-Heisenberg distorted diamond chain are investigated in detail. It is demonstrated that the zero-temperature magnetization curve may involve intermediate plateaus just at zero and one-half of the saturation magnetization. The temperature dependence of the specific heat may have up to three distinct peaks at zero magnetic field and up to four distinct peaks at a non-zero magnetic field. The origin of multipeak thermal behavior of the specific heat is comprehensively studied.