Spin-Density Waves and Charge-Density Waves in Cr Alloys

Abstract

Chromium metal is an itinerant antiferromagnet, which Orders as a spin-density waves (SDW) incommensurate with the lattice. The magnetic phase diagrams present three distinct phases: The paramagnetic phase (P) above Néel temperature T N; the SDW phase with transversal polarization (AF1), between T N(311 K) and spin-flip temperature T SF, which for Cr is 123.5 K; and the longitudinal polarization (AF2), below T SF. In the AF1 phase the wave vector Q is perpendicular to spin polarization vector (S), while in the AF2 phase, the polarization is parallel to Q. Therefore, the AF1 phase is characterized by magnetic domains of the type (Q 1,S j), with i, j (i, j = H, K, L—directions of reciprocal space), and orthorhombic symmetry. The AF2 phase has the magnetic domains (Q i, S j) with i = j, and, therefore shows tetragonal symmetry (Fawcett, 1988; Fawcett et al., 1994).KeywordsLocal Magnetic MomentMagnetic Phase DiagramMagnetic ScatteringNeel TemperatureNonmagnetic ImpurityThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.