Spin Density Waves in an Electron Gas
1962; American Institute of Physics; Volume: 128; Issue: 3 Linguagem: Inglês
10.1103/physrev.128.1437
ISSN1536-6065
Autores Tópico(s)Magnetic properties of thin films
ResumoIt is shown rigorously that the paramagnetic state of an electron gas is never the Hartree-Fock ground state, even in the high-density---or weak-interaction---limit. The paramagnetic state is always unstable with respect to formation of a static spin density wave. The instability occurs for spin-density waves having a wave vector $Q\ensuremath{\approx}2{k}_{F}$, the diameter of the Fermi sphere. It follows that the (Hartree-Fock) spin susceptibility of the paramagnetic state is not a monotonic decreasing function with increasing $Q$, but rather a function with a singularity near $Q=2{k}_{F}$. Rather convincing experimental evidence that the antiferromagnetic ground state of chromium is a large-amplitude spin density wave state is summarized. A number of consequences of such states are discussed, including the problem of detecting them by neutron diffraction.
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