Charge and Spin Density Waves observed through their spatial fluctuations by coherent and simultaneous X-ray diffraction

Abstract

Spatial uctuations of spin density wave (SDW) and charge density wave (CDW) in chromium have been compared by combining coherent and simultaneous X-ray diffraction experiments. Despite their close relationship, spatial fluctuations of the spin and of the charge density waves display a very different behavior: the satellite reflection associated to the charge density displays speckles while the spin one displays an impressive long-range order. This observation is hardly compatible with the commonly accepted magneto-elastic origin of CDW in chromium and is more consistent with a purely electronic scenario where CDW is the second harmonic of SDW. A BCS model taking into account a second order nesting predicts correctly the existence of a CDW and explains why the CDW is more sensitive to punctual defects.

4 pages, 4 figures; Accepted in Phys. Rev. B

References in corpus (3)

• Direct measurement of antiferromagnetic domain fluctuations
• X-ray Microdiffraction Images of Antiferromagnetic Domain Evolution in Chromium
• Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet

Cited by in corpus (6)

• The Theory of Spin Noise Spectroscopy: A Review
• Laser-Induced Charge-Density-Wave Transient Depinning in Chromium
• Field induced suppression of charge density wave in GdNiC${}_2$
• Collective transport of charges in charge density wave systems based on traveling soliton lattices
• Elucidation of the helical spin structure of FeAs
• Tracking defects of Electronic Crystals by Coherent X-ray Diffraction