Direct Observation of the Charge-Density Wave in Potassium by Neutron Diffraction

Abstract

Sharp charge-density-wave satellites in potassium have been located at (0.995, 0.975, 0.015). They are smaller than the {110} reflections by \ensuremath{\sim} ${10}^{5}$, and each is surrounded by a prolate ellipsoidal cloud of diffuse phason scattering having its major axis along a line through the point (1,1,0).