Landau theory of compressible magnets near a quantum critical point

Abstract

Landau theory is used to investigate the behaviour of a metallic magnet driven towards a quantum critical point by the application of pressure. The observed dependence of the transition temperature with pressure is used to show that the coupling of the magnetic order to the lattice diverges as the quantum critical point is approached. This means that a first order transition will occur in magnets (both ferromagnets and antiferromagnets) because of the coupling to the lattice. The Landau equations are solved numerically without further approximations. There are other mechanisms that can cause a first order transition so the significance of this work is that it will enable us to determine the extent to which any particular first order transition is driven by coupling to the lattice or if other causes are responsible.

12 pages including 5 figures, to be presented at MMM-Intermag conference and accepted for publication in Journal of Applied Physics

References in corpus (3)

• Quantum Criticality in Heavy Fermion Metals
• Phase separation and suppression of critical dynamics at quantum transitions of itinerant magnets: MnSi and (Sr${}_{1-x}$Ca${}_x$)RuO${}_3$
• Pressure Induced Quantum Phase Transitions

Cited by in corpus (5)

• Metallic Quantum Ferromagnets
• Disorder dependence of the ferromagnetic quantum phase transition
• Quantum Annealed Criticality
• Quantum Annealed Criticality: A Scaling Description
• Strong correlation between $H$-linear magnetoresistance and strange metal in FeSe superconductor