Neutron diffraction in a model itinerant metal near a quantum critical point

Details Neutron diffraction in a model itinerant metal near a quantum critical point Neutron diffraction in a model itinerant metal near a quantum critical point

2008-07-23

arxiv.org/abs/0807.3586v2

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted as a part of proceedings of LT25 (Amsterdam 2008)

Scientific paper

10.1088/1742-6596/150/4/042189

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+/-delta_1,2, 0, 0)*2pi/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.

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