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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Canfield P C; Bud'ko S L; Ni N; Yan J Q; Kracher A . 2009. Decoupling of the superconducting and magnetic/structural phase transitions in electron-doped BaFe2As2. Physical Review B. 80:060501. abstract
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Li H F; Tian W; Zarestky J L; Kreyssig A; Ni N; Bud'ko S L; Canfield P C; Goldman A I; McQueeney R J; Vaknin D . 2009. Magnetic and lattice coupling in single-crystal SrFe2As2: A neutron scattering study. Physical Review B. 80:054407. abstract
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Mun E D; Bud'ko S L; Ni N; Thaler A N; Canfield P C . 2009. Thermoelectric power and Hall coefficient measurements on Ba(Fe1-xTx)(2)As-2 (T=Co and Cu). Physical Review B. 80:054517. abstract
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Ivanshin V A; Sukhanov A A; Sokolov D A; Aronson M C; Jia S; Bud'ko S L; Canfield P C . 2009. Electron spin resonance of dense Yb-based heavy-fermion compounds: New experimental data. Journal of Alloys and Compounds. 480:126-127. abstract
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Torikachvili M S; Bud'ko S L; Ni N; Canfield P C; Hannahs S T . 2009. Effect of pressure on transport and magnetotransport properties in CaFe2As2 single crystals. Physical Review B. 80:014521. abstract
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Vannette M D; Yeninas S; Morosan E; Cava R J; Prozorov R . 2009. Local-moment ferromagnetism and unusual magnetic domains in Fe1/4TaS2 crystals. Physical Review B. 80:024421. abstract
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Martin C; Gordon R T; Tanatar M A; Kim H; Ni N; Bud'ko S L; Canfield P C; Luo H; Wen H H; Wang Z; Vorontsov A B; Kogan V G; Prozorov R . 2009. Nonexponential London penetration depth of external magnetic fields in superconducting Ba1-xKxFe2As2 single crystals. Physical Review B. 80:020501. abstract
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Ni N; Thaler A; Kracher A; Yan J Q; Bud'ko S L; Canfield P C . 2009. Phase diagrams of Ba(Fe1-xMx)(2)As-2 single crystals (M=Rh and Pd). Physical Review B. 80:024511. abstract
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Kogan V G; Martin C; Prozorov R . 2009. Superfluid density and specific heat within a self-consistent scheme for a two-band superconductor. Physical Review B. 80:014507. abstract
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Kacmarcik J; Marcenat C; Klein T; Pribulova Z; van der Beek C J; Konczykowski M; Budko S L; Tillman M; Ni N; Canfield P C . 2009. Strongly dissimilar vortex-liquid regimes in single-crystalline NdFeAs(O,F) and (Ba,K)Fe2As2: A comparative study. Physical Review B. 80:014515. abstract
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