Scaling in Dynamic Susceptibility of Herbertsmithite and Heavy-Fermion Metals

TL;DR

This paper develops a theory for the dynamic magnetic susceptibility of quantum spin liquids, matching experimental data on herbertsmithite and heavy-fermion metals, and predicts new magnetic field scaling behavior.

Contribution

It introduces a novel theoretical framework that explains experimental observations and predicts magnetic field scaling in quantum spin liquids and heavy-fermion metals.

Findings

Good agreement with experimental susceptibility data

Prediction of new magnetic field scaling behavior

Quantum spin liquid polarization under strong fields

Abstract

We present a theory of the dynamic magnetic susceptibility of quantum spin liquid. The obtained results are in good agreement with experimental facts collected on herbertsmithite ZnCu3(OH)6Cl2 and on heavy-fermion metals, and allow us to predict a new scaling in magnetic fields in the dynamic susceptibility. Under the application of strong magnetic fields quantum spin liquid becomes completely polarized. We show that this polarization can be viewed as a manifestation of gapped excitations when investigating the spin-lattice relaxation rate.