Neutron, Electron, and X-ray Scattering Investigation of Cr1-xVx Near Quantum Criticality

Published: July 29, 2014


D. A. Sokolov, M. C. Aronson, L. Wu, Y. Zhu, C. Nelson, J. F. Mansfield, K. Sun, Ross W. Erwin, Jeffrey W. Lynn, M. Lumsden, S. E. Nagler


The weakness of electron-electron correlations in the itinerant antiferromagnet Cr doped with V has long been considered the reason that neither new collective electronic states or even non Fermi liquid behaviour are observed when antiferromagnetism in Cr1-xVx is suppressed to zero temperature. We present the results of neutron and electron diffraction measurements of several lightly doped single crystals of Cr1-xVx in which the archtypal spin density wave instability is progressively suppressed as the V content increases, freeing the nesting-prone Fermi surface for a new striped charge instability that occurs at X{i}c=0.037. This novel nesting driven instability relieves the entropy accumulation associated with the suppression of the spin density wave and avoids the formation of a quantum critical point by stabilising a new type of charge order at temperatures in excess of 400 K. Restructuring of the Fermi surface near quantum critical points is a feature found in materials as diverse as heavy fermions, high temperature copper oxide superconductors and now even elemental metals such as Cr.
Citation: Physical Review B
Volume: 90
Issue: 3
Pub Type: Journals

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Itinerant Antiferromagnet, Neutron Diffraction, Spin density wave, charge order, quantum critical point, Fermi surface reconstruction
Created July 29, 2014, Updated February 19, 2017