Complex States, Emergent Phenomena & Superconductivity in Intermetallic & Metal-like Compounds


Project Leader(s):
Paul Canfield

Principal Investigators:
Sergey Bud'ko, Paul Canfield, John Clem, David Johnston, Adam Kaminski, Vladimir Kogan, Ruslan Prozorov, Makariy Tanatar,

Postdoctoral Research Associates:
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)


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McQueeney R J; Diallo S O; Antropov V P; Samolyuk G D; Broholm C; Ni N; Nandi S; Yethiraj M; Zarestky J L; Pulikkotil J J; Kreyssig A; Lumsden M D; Harmon B N; Canfield P C; Goldman A I . 2008. Anisotropic Three-Dimensional Magnetism in CaFe2As2. Physical Review Letters. 101:227205. abstract
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Reibelt M; Schilling A; Canfield P C; Ravikumar G; Berger H . 2008. Differential-thermal analysis around and below the critical temperature T-c of various low-T-c superconductors: A comparative study. Physica C-Superconductivity and Its Applications. 468:2254-2266. abstract
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Khasanov R; Kondo T; Strassle S; Heron D O G; Kaminski A; Keller H; Lee S L; Takeuchi T . 2008. Evidence for a Competition between the Superconducting State and the Pseudogap State of (BiPb)(2)(SrLa)(2)CuO6+delta from Muon Spin Rotation Experiments. Physical Review Letters. 101:227002. abstract
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Vannette M D; Prozorov R . 2008. Field-dependent AC susceptibility of itinerant ferromagnets. Journal of Physics-Condensed Matter. 20:475208. abstract
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Kreyssig A; Green M A; Lee Y; Samolyuk G D; Zajdel P; Lynn J W; Bud'ko S L; Torikachvili M S; Ni N; Nandi S; Leao J B; Poulton S J; Argyriou D N; Harmon B N; McQueeney R J; Canfield P C; Goldman A I . 2008. Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering. Physical Review B. 78:184517. abstract
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Martin C; Vannette M D; Gordon R T; Prozorov R; Karpinski J; Zhigadlo N D . 2008. Effect of C and Li doping on the rf magnetic susceptibility in MgB2 single crystals. Physical Review B. 78:144512. abstract
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Simon F; Dora B; Muranyi F; Janossy A; Garaj S; Forro L; Bud'ko S; Petrovic C; Canfield P C . 2008. Generalized Elliott-Yafet Theory of Electron Spin Relaxation in Metals: Origin of the Anomalous Electron Spin Lifetime in MgB2. Physical Review Letters. 101:177003. abstract
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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. abstract
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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. abstract
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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. abstract
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