# Towards low-temperature peculiarities of thermodynamic quantities for decorated spin chains

## TL;DR

This paper investigates the low-temperature behavior of decorated spin chains, revealing that their peculiar thermodynamic properties are linked to the critical point of an effective Ising model after tracing out decorations.

## Contribution

It introduces a perspective connecting low-temperature peculiarities of decorated spin chains to the critical point of an effective Ising model, supported by multiple chain examples.

## Key findings

- Low-temperature behavior linked to Ising model critical point
- Effective temperature-dependent parameters after tracing decorations
- Illustrated with three specific spin chain models

## Abstract

We discuss the origin of an enigmatic low-temperature behavior of one-dimensional decorated spin systems which was coined the pseudo-transition. Tracing out the decorated parts results in the standard Ising-chain model with temperature-dependent parameters and the unexpected low-temperature behavior of thermodynamic quantities and correlations of the decorated spin chains can be tracked down to the critical point of the standard Ising-chain model at ${\sf H}=0$ and ${\sf T}=0$. We illustrate this perspective using as examples the spin-1/2 Ising-XYZ diamond chain, the coupled spin-electron double-tetrahedral chain, and the spin-1/2 Ising-Heisenberg double-tetrahedral chain.