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Title: Itinerant density wave instabilities at classical and quantum critical points

Charge ordering in metals is a fundamental instability of the electron sea, occurring in a host of materials and often linked to other collective ground states such as superconductivity. What is difficult to parse, however, is whether the charge order originates among the itinerant electrons or whether it arises from the ionic lattice. Here in this study we employ high-resolution X-ray diffraction, combined with high-pressure and low-temperature techniques and theoretical modelling, to trace the evolution of the ordering wavevector Q in charge and spin density wave systems at the approach to both thermal and quantum phase transitions. The non-monotonic behaviour of Q with pressure and the limiting sinusoidal form of the density wave point to the dominant role of the itinerant instability in the vicinity of the critical points, with little influence from the lattice. Fluctuations rather than disorder seem to disrupt coherence.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5] ;  [6]
  1. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Univ. of Chicago, IL (United States). James Franck Inst. and Dept. of Physics
  2. Univ. of Amsterdam (Netherlands). Inst. for Theoretical Physics
  3. Univ. of Chicago, IL (United States). James Franck Inst. and Dept. of Physics
  4. Univ. of Bristol (United Kingdom). H. H.Wills Physics Lab.
  5. Univ. of Chicago, IL (United States). James Franck Inst. and Dept. of Physics; Argonne National Lab. (ANL), Argonne, IL (United States). Physical Sciences and Engineering
  6. Univ. of Chicago, IL (United States). James Franck Inst. and Dept. of Physics; California Inst. of Technology (CalTech), Pasadena, CA (United States). Division of Physics, Mathematics, and Astronomy
Publication Date:
OSTI Identifier:
1237950
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Nature Physics
Additional Journal Information:
Journal Volume: 11; Journal Issue: 10; Journal ID: ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Netherlands Organization for Scientific Research (NWO)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS