Magnetism Close to the Metal-Insulator Transition in V 2 O 3 The Metal-Insulator Transition in V 2 O 3 Metallic V 2-y O 3 - Quantum critical heavy fermions.

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Magnetism Close to the Metal-Insulator Transition in V 2 O 3 The Metal-Insulator Transition in V 2 O 3 Metallic V 2-y O 3 - Quantum critical heavy fermions Insulating (V 1-x Cr x ) 2 O 3 - Coupled orbital and spin degrees of freedom Summary Collin Broholm * Johns Hopkins University and NIST Center for Neutron Research * Supported by the NSF through NSF DMR

Alloying and Pressure effects in V 2 O 3  Cr-doping (3d 3 ) More Insulating  Add a site to which 3d electrons cannot hop  Ti-doping (3d 1 ) More metallic  Add a site to which 3d electrons can hop  Vacancy doping V 2-y O 3 More metallic  Add holes to 3d bands  Hydrostatic Pressure More metallic  Counteract lattice expansion in insulator  Increase orbital overlap thus decrease U/W

Collaborators Wei BaoLos Alamos National Laboratory G. AeppliNEC Research Institute S. A. CarterU. C. Santa Cruz P. DaiOak Ridge National Laboratory T. F. RosenbaumUniversity of Chicago J. M. Honig Purdue University P. MetcalfPurdue University S. F. TrevinoU. S. Army Research Lab and NIST Experiments performed at NIST Center for Neutron Research HFIR, Oak Ridge National Laboratory ISIS Facility, Rutherford Appleton Laboratory

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Conclusions  Weakly doped V 2 O 3 can lie on either side of an electron correlation induced Metal-Insulator Transition  Metallic V 2-y O 3  “Heavy” Fermion system (v f =10 4 m/s).  Fermi surface nesting apparent in broad T-range.  Weak low T SDW and partially gapped Fermi surface almost quantum critical metal.  Moriya SCR theory provides Quantitative link between dynamical and thermal properties.  Insulating (V 1-x Cr x ) 2 O 3  Local Structural and Orbital degrees of freedom couple to the spin system and limit correlation length at high T,  These degrees of freedom order for T<180 K at which point long range spin order and coherent spin waves develop.