Neutron diffraction in a model itinerant metal near aquantum critical point

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Journal of Physics Conference Series

DOI:https://doi.org/10.1088/1742-6596/150/4/042189· OSTI ID:979154

Sokolov, D A ^[1]; Aronson, Meigan C. ^[1]; Erwin, R ^[2]; Lynn, J. W. ^[2]; Lumsden, Mark D ^[3]; Nagler, Stephen E ^[3]

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1. Brookhaven National Laboratory (BNL)
2. National Institute of Standards and Technology (NIST)
3. ORNL

Neutron diffraction measurements on single crystals of Cr1−xVx (x=0, 0.02, 0.037) show that the ordering moment and the Neel temperature are continuously suppressed as x approaches 0.037, a proposed Quantum Critical Point (QCP). The wave vector Q of the spin density wave (SDW) becomes more incommensurate as x increases in accordance with the two band model. At xC=0.037 we have found temperature dependent, resolution limited elastic scattering at 4 incommensurate wave vectors Q=(1 1,2, 0, 0)*2/a, which correspond to 2 SDWs with Neel temperatures of 19 K and 300 K. Our neutron diffraction measurements indicate that the electronic structure of Cr is robust, and that tuning Cr to its QCP results not in the suppression of antiferromagnetism, but instead enables new spin ordering due to novel nesting of the Fermi surface of Cr.

• Research Organization: Oak Ridge National Laboratory (ORNL); High Flux Isotope Reactor
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 979154
• Journal Information: Journal of Physics Conference Series, Journal Name: Journal of Physics Conference Series Journal Issue: 4 Vol. 150
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTIFERROMAGNETISM
ELASTIC SCATTERING
ELECTRONIC STRUCTURE
FERMI LEVEL
MONOCRYSTALS
NEEL TEMPERATURE
NEUTRON DIFFRACTION
RESOLUTION
SPIN
TUNING
VECTORS