Quantum correlations in a mixed spin-(1/2,1) Heisenberg dimer

TL;DR

This paper investigates thermal quantum correlations in a mixed spin-(1/2,1) Heisenberg dimer, revealing room temperature quantum correlations via fidelity-based measures, despite the absence of entanglement above 141K.

Contribution

It demonstrates the existence of room temperature quantum correlations in a specific heterodinuclear complex using measurement-induced nonlocality measures.

Findings

Quantum correlations increase with magnetic field in an unconventional manner.

Room temperature quantum correlations are observed via fidelity-based MIN.

Entanglement disappears at 141K, but quantum correlations persist.

Abstract

In this article, we consider the heterodinuclear complex [Ni(dpt)(H2O)Cu(pba)].2H2O [pba =1,3-propylenebis(oxamato) and dpt = bis-(3-aminopropyl)amine] realized through the theoretical model of mixed spin-(1/2,1) coupled via Heisenberg interaction. We study the behaviors of thermal quantum correlations of the above material via Measurement-Induced Nonlocality (MIN) based on Hilbert-Schmidt norm and fidelity. We observe that the quantum correlation measures increase with the magnetic field in an unconventional way. The role of system parameters is also brought out at thermal equilibrium. The highlight of the results is that we are able to show the existence of room temperature quantum correlation using fidelity based MIN whereas the entanglement ceases to exist at 141K