Spin density wave

A sketch in k-space of a (001) section of the Fermi surface of Cr. The band structure of Cr yields an electron pocket (green) centered at Gamma and a hole pocket (blue) centered at H. The surrounding black square indicates the boundary of the first Brillouin zone.

Spin-density wave (SDW) and charge-density wave (CDW) are names for two similar low-energy ordered states of solids. Both these states occur at low temperature in anisotropic, low-dimensional materials or in metals that have high densities of states at the Fermi level $N(E_F)$ . Other low-temperature ground states that occur in such materials are superconductivity, ferromagnetism and antiferromagnetism. The transition to the ordered states is driven by the condensation energy which is approximately $N(E_F) \Delta^2$ where $\Delta$ is the magnitude of the energy gap opened by the transition. Note that SDWs are distinct from spin waves, which are an excitation mode of ferromagnets and antiferromagnets.

单词	Spin density wave
释义	Spin density wave 英语百科 Spin density wave Spin-density wave (SDW) and charge-density wave (CDW) are names for two similar low-energy ordered states of solids. Both these states occur at low temperature in anisotropic, low-dimensional materials or in metals that have high densities of states at the Fermi level $N(E_F)$ . Other low-temperature ground states that occur in such materials are superconductivity, ferromagnetism and antiferromagnetism. The transition to the ordered states is driven by the condensation energy which is approximately $N(E_F) \Delta^2$ where $\Delta$ is the magnitude of the energy gap opened by the transition. Note that SDWs are distinct from spin waves, which are an excitation mode of ferromagnets and antiferromagnets.
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