Mo 3 Al 2 C

1. Carbon-based Materials – Nanowires to Exotic SuperconductorsDavid P. Young, Louisiana State University, DMR 0449022 • Our research group has recently been studying the magnetic and transport properties of several carbon-based materials, including, carbon nanotubes, microfibers, and bulk super-conductors (materials that transport electricity with zero resistance). • A novel technique of producing carbon nanotubes (10×10-9 meters wide!) at a much lower temperature than standard synthesis methods was developed (Figure (a)). • We directly synthesized MgCNi3 on the surface of carbon microfiber, thus producing a very high-current, high-strength, and low-weight superconducting microwire (Figures (b) and (c)). • We discovered the bulk superconductivity in Mo3Al2C (Figure (d)) is unconventional, due to a lack of symmetry to its crystal structure. Being also non-magnetic, Mo3Al2C is unique among this small group of non-symmetric materials, and therefore very attractive to study theoretically. (a) (b) Human hair Microfiber (d) (c) Mo3Al2C MgCNi3 Above. (a) Atomic force microscopy image of vertical, free-standing carbon nanotubes formed at 84 K. (b) Superconducting microfiber of MgCNi3 compared to the size of a human hair. (c) Electron microscope image of the cross-section of several fibers. (d) Resistivity vs. temperature plot showing the transition to zero-resistance (superconductivity) in Mo3Al2C.

2. Carbon-based Materials – Nanowires to Exotic SuperconductorsDavid P. Young, Louisiana State University, DMR 0449022 • Our experimental research is integrated into an educational program that enhances student learning in both the laboratory and classroom. • Student training and support within the area of condensed matter physics: Postdocs, graduate students, and undergraduates are trained and gain experience in multiple techniques of materials synthesis and characterization. Furthermore, the general public is exposed to our research through public lectures, demonstrations, and visitations to local middle and high schools. • Student training and support in the life sciences: For more than a decade now we have supported undergraduate research in our lab, providing experience and opportunities for non-physics majors. They are involved in real research projects, and many of their results lead to publications. (a) (b) Above. (a) Map showing the universities in Louisiana that participate in the LBRN program which provides research opportunities for life science majors. (b) Sample holder built by undergraduate students to measure the thermoelectric properties of thin films.