EVIDENCE OF THE 5TH-ORDER AND THE 7TH-ORDER HARMONICS OF SPIN-DENSITYWAVES IN CHROMIUM

Evidence of the fifth-order, H-5 and possibly of the seventh-order, H- 7 harmonics of the spin-density waves (SDW) was found for the first ti me from the Sn-119 Mossbauer spectrum registered at room temperature o n a (1 1 0) face of a single-crystal sample of chromium. The best-fit relative values obtained for H-5 and H-7 are: H-5/H-1 = 1.0(5) X 10(-2 ) and H-7/H-1 = -0.9(8) X 10(-2), H-1 being the amplitude of the funda mental SDW. The analysis of the spectrum gave also the first direct ev idence of the existence of the charge-density waves in chromium with t he maximum amplitude of the order of 10(-2).