X-ray search for CDW in single crystal YBa{sub 2}CU{sub 3}O{sub 7-{delta}}
- Brookhaven National Lab., Upton, NY (United States)
- AT and T Bell Labs., Murray Hill, NJ (United States)
- Houston Univ., TX (United States)
- Oak Ridge Associated Universities, Inc., TN (United States)
- Illinois Univ., Urbana, IL (United States). Dept. of Physics
Recently, H.L. Edwards et al. observed, in STM experiments at 20K, modulations in the CuO chain layer of cold-cleaved single crystals of YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} which they interpreted as a possible charge density wave (CDW). Since X-ray scattering is an ideal tool for the study of static or dynamic lattice displacements, we performed a synchrotron X-ray study at beamline X14 at the NSLS of BNL on a high quality single crystal of YBa{sub 2}Cu{sub 3}O{sub 7- {delta}}, which was mainly single domain with a spacially well localized volume fraction of other twin orientations of roughly 10%. Appropriate scattering configurations were chosen to enable observations of longitudinal or transverse CDWs with polarization either in the chain direction, {parallel} <001> or {perpendicular} to it in <001>. The X-ray energy of 16keV allowed us to reach large momentum transfers to increase the sensitivity to lattice displacements. In none of our scans, which definitely covered the case of a 1-dimensional longitudinal CDW with propagation in the b direction as proposed by Edwards et al., did we find intensity other than the main Bragg peak(s) and the twin reflections. We therefore suspect that the STM finding may be a surface-induced phenomenon.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Science Foundation, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 242694
- Report Number(s):
- BNL-63039; CONF-960366-11; ON: DE96010688; CNN: DMR-92-08420; DMR-91-20000; TRN: 96:014620
- Resource Relation:
- Conference: 10. anniversary high temperature superconductivity workshop on physics, materials and applications, Houston, TX (United States), 12-16 Mar 1996; Other Information: PBD: [1996]
- Country of Publication:
- United States
- Language:
- English
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