Raman scattering study of lattice and magnetic excitations in CrAs

Abstract

We report on the lattice and spin dynamics in the monopnictide CrAs using polarized Raman scattering. This system exhibits a first-order magneto-structural phase transition at T_N~ 265 K, below which the magnetic moments of Cr form an incommensurate double helical magnetic structure while the unit cell volume abruptly expands. Across the transition, the frequencies of the fully symmetric Ag phonons strongly renormalize, which along with the results of first-principle calculations suggest the presence of a sizeable coupling of the phonons to the magnetic degrees of freedom in this compound. In addition, we observe two broad modes around 350 and 1700 cm-1 in the magnetic phase, which we associate with two-magnon Raman scattering. This work provides one of the few examples of magnetic Raman scattering from a non-collinear magnet.

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Cited by in corpus (5)

• Intra-chain collinear magnetism and inter-chain magnetic phases in Cr3As3-K-based materials
• Lattice dynamics in the double-helix antiferromagnet FeP
• Potential of Raman scattering in probing magnetic excitations and their coupling to lattice dynamics
• Dimensionality of the superconductivity in the transition metal pnictide WP
• Non-Loudon-Fleury Raman scattering in spin-orbit coupled Mott insulators