Pressure-Tuned Spin and Charge Ordering in an Itinerant Antiferromagnet

Yejun Feng, R. Jaramillo, G. Srajer, J. C. Lang, Z. Islam, M. S. Somayazulu, O. G. Shpyrko, J. J. Pluth, H.-k. Mao, E. D. Isaacs, G. Aeppli, and T. F. Rosenbaum
Phys. Rev. Lett. 99, 137201 – Published 24 September 2007

Abstract

Elemental chromium orders antiferromagnetically near room temperature, but the ordering temperature can be driven to zero by applying large pressures. We combine diamond anvil cell and synchrotron x-ray diffraction techniques to measure directly the spin and charge order in the pure metal at the approach to its quantum critical point. Both spin and charge order are suppressed exponentially with pressure, well beyond the region where disorder cuts off such a simple evolution, and they maintain a harmonic scaling relationship over decades in scattering intensity. By comparing the development of the order parameter with that of the magnetic wave vector, it is possible to ascribe the destruction of antiferromagnetism to the growth in electron kinetic energy relative to the underlying magnetic exchange interaction.

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  • Received 10 June 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.137201

©2007 American Physical Society

Authors & Affiliations

Yejun Feng1, R. Jaramillo1, G. Srajer2, J. C. Lang2, Z. Islam2, M. S. Somayazulu3, O. G. Shpyrko4, J. J. Pluth5, H.-k. Mao3, E. D. Isaacs1,4, G. Aeppli6, and T. F. Rosenbaum1,*

  • 1The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA
  • 2The Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3Geophysical Laboratory, Carnegie Institute of Washington, Washington, D.C. 20015, USA
  • 4Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5CARS and Department of Geophysical Sciences, The University of Chicago, Chicago, Illinois 60637, USA
  • 6London Centre for Nanotechnology and Department of Physics and Astronomy, UCL, London, WC1E 6BT, United Kingdom

  • *Corresponding author. tfr@uchicago.edu

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Issue

Vol. 99, Iss. 13 — 28 September 2007

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