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From left to right : Wes Miller REU student 2006 Columbine Robinson UCSD undergraduate 2005

The Interaction Between Magnetism and Superconductivity in Novel Uranium Compounds M. Brian Maple, University of California, San Diego — DMR 0335173.

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From left to right : Wes Miller REU student 2006 Columbine Robinson UCSD undergraduate 2005

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  1. The Interaction Between Magnetism and Superconductivity in Novel Uranium CompoundsM. Brian Maple, University of California, San Diego — DMR 0335173 Within the field of condensed matter physics devoted to the study of correlated electron materials, the metallic compound URu2Si2 is known for its puzzling hidden order phase that defies conclusive identification. Our laboratory has developed techniques for growing large single crystals of URu2Si2 to facilitate the study of this material’s unusual physical properties. The crystal structure of URu2Si2 and a photograph of a single crystal of URu1.8Re0.2Si2. This sample is about 1 inch long, although larger samples are routinely grown. Our current research effort involves chemical substitution of Re for Ru, which suppresses the formation of hidden order and may give rise to quantum critical phenomena at intermediate concentrations. We are also studying the effects of pressure on the hidden order, ferromagnetic, and superconducting phases of URu2Si2. Low temperature - composition (T-x) phase diagram for URu2-xRexSi2. Substitution of Re for Ru eventually destroys hidden order and gives rise to ferromagnetism at higher Re concentrations.

  2. The Interaction Between Magnetism and Superconductivity in Novel Uranium CompoundsM. Brian Maple, University of California, San Diego — DMR 0335173 UCSD Undergraduates 2005-2006 Christopher Lee Columbine Robinson Alex Dooraghi Keith Chan Brian Maertz Yong-Chan Kim Colin McElroy Ben Yukich Martha Coakley Summer REU Students 2006 Wes Miller Kevin Zeilnicki Undergraduate Student Research: Undergraduate students from UCSD as well as summer REU students from other universities make up a significant portion of our lab and are involved in many research projects. Specifically, the undergraduates participate in sample preparation and are trained to perform some measurements such as powder x-ray diffraction, electrical resistivity, and magnetic susceptibility. Their involvement not only benefits the lab but also prepares them for future careers in the sciences. From left to right : Wes Miller REU student 2006 Columbine Robinson UCSD undergraduate 2005 Colin McElroy UCSD undergraduate 2005

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