Field-Induced Quantum Criticality of Systems with Ferromagnetically Coupled Structural Spin Units

TL;DR

This paper investigates the quantum critical behavior of ferromagnetically coupled spin systems under magnetic fields using renormalization group theory, providing insights into phase boundaries and experimental observations.

Contribution

It applies Wilson's renormalization group framework to analyze field-induced quantum criticality in ferromagnetic spin systems, offering a theoretical interpretation of recent experiments.

Findings

Determines the low-temperature phase boundary at quantum critical points.

Analyzes the behavior of physical quantities near criticality.

Provides a theoretical interpretation of experimental results.

Abstract

The field-induced quantum criticality of compounds with ferromagnetically coupled structural spin units (as dimers and ladders) is explored by applying Wilson's renormalization group framework to an appropriate effective action. We determine the low-temperature phase boundary and the behavior of relevant quantities decreasing the temperature with the applied magnetic field fixed at its quantum critical point value. In this context, a plausible interpretation of some recent experimental results is also suggested.