Energy dispersive x-ray diffraction of charge density waves via chemical filtering
Pressure tuning of phase transitions is a powerful tool in condensed matter physics, permitting high-resolution studies while preserving fundamental symmetries. At the highest pressures, energy dispersive x-ray diffraction (EDXD) has been a critical method for geometrically confined diamond anvil cell experiments. We develop a chemical filter technique complementary to EDXD that permits the study of satellite peaks as weak as 10^(-4) of the crystal Bragg diffraction. In particular, we map out the temperature dependence of the incommensurate charge density wave diffraction from single-crystal, elemental chromium. This technique provides the potential for future GPa pressure studies of many-body effects in a broad range of solid state systems.
Additional Information© 2005 American Institute of Physics. Received 17 March 2005; accepted 1 May 2005; published online 10 June 2005. Y.F. would like to acknowledge stimulating discussions with G.T. Seidler and G. Aeppli, and also the great hospitality he received from G. Shen at GSECARS. We thank J. Shu for sample preparation, J. Pluth for sample characterization, and E. Rod and H. Krebs for technical assistance. The work at the University of Chicago was supported by the National Science Foundation under Grant No. DMR-0114798. In addition, R.J. was supported by a NSF Graduate Research Fellowship. Use of the HPCAT facility at APS was supported by DOE-BES, DOE-NNSA (CDAC), NSF, DOD–TACOM, and the W.M. Keck Foundation, and the X17C facility at NSLS was supported by COMPRES.
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