Metallic Continuum Quantum Ferromagnets at Finite Temperature

Abstract

We study via renormalization group (RG) and large N methods the problem of continuum SU(N) quantum Heisenberg ferromagnets (QHF) coupled to gapless electrons. We establish the phase diagram of the dissipative problem and investigate the changes in the Curie temperature, magnetization, and magnetic correlation length due to dissipation and both thermal and quantum fluctuations. We show that the interplay between the topological term (Berry's phase) and dissipation leads to non-trivial effects for the finite temperature critical behavior.

Corrected typos, new discussion of T=0 results, to appear in Europhys. Lett

References in corpus (3)

• 1/N expansion for two-dimensional quantum ferromagnets
• Monte Carlo study of a two-dimensional quantum ferromagnet
• Non-perturbative saddle point for the effective action of disordered and interacting electrons in 2D

Cited by in corpus (2)

• Disorder effects in diluted magnetic semiconductors
• Interplay between disorder, quantum and thermal fluctuations in ferromagnetic alloys: The case of UCu2Si(2-x)Ge(x)