Domains in the Spin-Density-Wave Phases of Chromium

Lattice-distortion domain walls in the spin-density-wave phases of Cr are thin, have negative free energy, and provide an explanation for the irreversibility of increases of $\delta$ in $Q=\left(\frac{2\pi }{a}\right)(1\mathrm{}\pm \delta )$ with increases in pressure at $T\ll 50$ K, observed in de Haas-van Alphen experiments of Ruesink, Perz, and Templeton. Domain walls of the spin-density wave itself have positive free energies, have thickness ≳1000 Å, and cannot be used to explain these experimental results.