Macroscopic quantum tunneling and coherence of spins

TL;DR

This paper reviews how quantum tunneling rates are suppressed or quenched in magnetic particles with half-odd-integer spins, especially under magnetic fields, highlighting key phenomena in spin coherence.

Contribution

It provides a comprehensive review of the mechanisms behind tunneling suppression and quenching in spin systems, emphasizing the effects of magnetic fields on spin coherence.

Findings

Suppression of tunneling rate in half-odd-integer spins

Quenching of tunneling rate with magnetic field

Insights into spin coherence phenomena

Abstract

We present a review of suppression of tunneling rate (energy splitting) for half-odd-integer spins in ferromagnetic and antiferromagnetic particles. We also review the quenching of the tunneling rate in the presence of a magnetic field.