Abstract
The itinerant-electron antiferromagnet is a condensate of electron-hole pairs which have pair spin S=1. In chromium, the order parameter is a sinusoidal wave with spin polarisation in a single direction. This means that two equal-spin-pairing states occur with Sz=+or-1, and the Sz=0 state is missing. This corresponds to the Anderson-Brinkman-Morel state believed to describe the A phase condensate of helium three. It is shown that the dynamic magnetism of an itinerant-electron antiferromagnet such as chromium can be expressed in a formalism identical to the one used by Leggett for the condensed phases of helium three. Antiferromagnetic resonances of an itinerant-electron antiferromagnet are the same as the 'internal Josephson effect' in helium three discussed by Leggett, Maki and Tsuneto (1974), and others.
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