Complex States, Emergent Phenomena & Superconductivity in Intermetallic & Metal-like Compounds
Kyuil Cho, Abhishek Pandey
The specific scientific question to be addressed by this Project is—can we develop, discover, understand and ultimately control, and predictably modify new and extreme examples of complex states, emergent phenomena, and superconductivity? Materials manifesting clear or compelling examples (or combinations) of superconductivity, strongly correlated electrons, quantum criticality, and exotic, bulk magnetism are of particular interest given their potential to lead to revolutionary steps forward in our understanding of their complex, and potentially energy relevant, properties. Experiment and theory are implemented synergistically. The experimental work consists of new materials development and crystal growth, combined with detailed and advanced measurements of microscopic, thermodynamic, and transport properties, as well as electronic structure, at extremes of pressure, temperature, magnetic field and resolution. The theoretical work focuses on modeling transport, thermodynamic and spectroscopic properties using world-leading, phenomenological approaches to superconductors and modern quantum many-body theory.
The ability to address these questions is illustrated by this group’s past work on many of the key systems and phenomena that have defined this field over the past decades: High Tc oxide, RNi2B2C and MgB2 superconductivity, Ce-, Yb- and transition metal-based heavy fermions, quantum criticality, quasicrystals, spin glasses, spin ladders / spin chains, vortex and domain pattern formation, ferromagnetism and metamagnetism.
- Design and growth (P. C. Canfield, S. Bud’ko, D. C. Johnston, J. Schmalian,V. Kogan)
- Advanced Characterization (S. Bud’ko, Y. Furukawa, A. Kaminski, R. Prozorov, M. Tanatar)
- Theory and modeling (J. R. Clem, V. Kogan, J. Schmalian)
Clem J . 2008. Geometrical Barriers and the Growth of Flux Domes in Thin Ideal Superconducting Disks. Journal of Superconductivity and Novel Magnetism. 21:343-352.
Liu C; Samolyuk G D; Lee Y; Ni N; Kondo T; Santander-Syro A F; Bud'ko S L; McChesney J L; Rotenberg E; Valla T; Fedorov A V; Canfield P C; Harmon B N; Kaminski A . 2008. K-Doping Dependence of the Fermi Surface of the Iron-Arsenic Ba1-xKxFe2As2 Superconductor Using Angle-Resolved Photoemission Spectroscopy. Physical Review Letters. 101:177005.
Kondo T; Santander-Syro A F; Copie O; Liu C; Tillman M E; Mun E D; Schmalian J; Bud'ko S L; Tanatar M A; Canfield P C; Kaminski A . 2008. Momentum dependence of the superconducting gap in NdFeAsO0.9F0.1 single crystals measured by angle resolved photoemission spectroscopy. Physical Review Letters. 101:147003.
Christianson A D; Lumsden M D; Delaire O; Stone M B; Abernathy D L; McGuire M A; Sefat A S; Jin R; Sales B C; Mandrus D; Mun E D; Canfield P C; Lin J Y Y; Lucas M; Kresch M; Keith J B; Fultz B; Goremychkin E . 2008. Phonon Density of States of LaFeAsO1-xFx. Physical Review Letters. 101:157004.