The "Higgs" Amplitude Mode in Weak Ferromagnetic Metals

• Authors: Yi Zhang , P. Farinas , K. Bedell
• Languages of publication: EN

Abstracts

EN

Using ferromagnetic Fermi liquid theory, Bedell and Blagoev derived the collective low-energy excitations of a weak ferromagnet. They obtained the well-known magnon (Nambu-Goldstone) mode and found a new gapped mode that was never studied in weak ferromagnetic metals. In this article we have identified this mode as the Higgs boson (amplitude mode) of a ferromagnetic metal. This is identified as the Higgs since it can be shown that it corresponds to a fluctuation of the amplitude of the order parameter. We use this model to describe the itinerant-electron ferromagnetic material MnSi. By fitting the model with the existing experimental results, we calculate the dynamical structure function and see well-defined peaks contributed from the magnon and the Higgs. Our estimates of the relative intensity of the Higgs amplitude mode suggest that it can be seen in neutron scattering experiments on MnSi.

Keywords

EN

75.10.-b; 71.10.Ay; 75.50.Cc

Discipline

• 71.10.Ay: Fermi-liquid theory and other phenomenological models
• 75.50.Cc: Other ferromagnetic metals and alloys
• 75.10.-b: General theory and models of magnetic ordering(see also 05.50.+q Lattice theory and statistics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 2
• Pages: 153-156

Dates

published

2015-02

Contributors

author

Yi Zhang

• Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA

author

P. Farinas

• Departamento de Física, Universidade Federal de São Carlos, 13565-905, São Carlos, SP, Brazil

author

K. Bedell

• Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA

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Identifiers

DOI

10.12693/APhysPolA.127.153