Investigating the Role of Disorder, Electron Concentration, and Lattice Compression in Uranium-based Heavy Fermion Systems

Speaker: 
Eteri Svanidze, McMaster University
Event Date and Time: 
Thu, 2017-05-25 14:00 - 15:00
Location: 
Hennings 318
Local Contact: 
Ian Affleck
Intended Audience: 
Graduate

Uranium intermetallic compounds exhibit a wide range of exotic properties -- unconventional superconductivity and quantum criticality, complex magnetic configurations, as well as heavy fermion and non-Fermi liquid behaviors. Moreover, while all of these phenomena are related to the degree of localization of the 5f electronic states, the complete understanding of underlying mechanisms is still lacking, explaining the unceasing interest in heavy fermion systems. One of the avenues in the search for heavy fermions has focused on compounds with high coordination number of U and, therefore, low concentration of U atoms. One such example is given by U2Zn17 - a heavy fermion antiferromagnet which exhibits a Sommerfeld coefficient  = 0.4 J/mol K2. In the presented work, the value of  was doubled by substituting all of Zn atoms by Cu and Ga, resulting in U2Cu17-xGax. This drastic effect is accompanied by non-Fermi liquid behavior. We analyze the relation between crystal structure, magnetic, and electronic properties of the U2Cu17-xGax compounds.

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