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Published May 1, 2010 | Published
Journal Article Open

Diffraction line-shapes, Fermi surface nesting, and quantum criticality in antiferromagnetic chromium at high pressure (invited)

Abstract

We explore the behavior of the nested bandstructure of chromium as a function of temperature and pressure to the point where magnetism disappears. X-ray diffraction measurements of the charge order parameter suggest that the nesting condition is maintained at high pressure, where the spin density wave ground state is destabilized by a continuous quantum phase transition. By comparing diffraction line-shapes measured throughout the temperature-pressure phase diagram we are able to identify and describe three regimes: thermal near-critical, weak coupling ground state, and quantum critical.

Additional Information

© 2010 American Institute of Physics. Presented 21 January 2010; received 27 October 2009; accepted 4 December 2009; published online 27 April 2010. The work at the University of Chicago was supported by the National Science Foundation under Grant No. DMR-0907025. We acknowledge valuable assistance from and discussions with Jonathan Lang, Zahir Islam, and George Srajer, all of the Advanced Photon Source (APS), and Argonne National Laboratory. Use of the APS is supported by the U.S. DOE-BES under Contract No. NEAC02-06CH11357.

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