Influence of crystalline boundaries on spin- and charge-density waves in chromium.

Abstract

Using the $^{119}\mathrm{Sn}$ M\"ossbauer effect we show that the crystalline boundaries have a profound influence on the shape of M\"ossbauer spectra. Based on the newly developed method of the harmonic analysis of the M\"ossbauer spectra, we analyze the measured spectra in terms of higher-order harmonics and reveal a relationship between the harmonics and the size of grains: the smaller the size, the greater the contribution of the harmonics, with the third-order one being negative and dominating. We also demonstrate that the present results support the up-to-date picture of the spin-density waves in the form of single Q domains.