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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Bud'ko S L; Canfield P C; Sefat A S; Sales B C; McGuire M A; Mandrus D . 2009. Anisotropic thermal expansion of Fe1.06Te and FeTe0.5Se0.5 single crystals. Physical Review B. 80:134523. abstract
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Gapud A A; Moraes S; Khadka R P; Favreau P; Henderson C; Canfield P C; Kogan V G; Reyes A P; Lumata L L; Christen D K; Thompson J R . 2009. Flux quanta driven by high-density currents in low-impurity V3Si and LuNi2B2C: Free flux flow and fluxon-core size effect. Physical Review B. 80:134524. abstract
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Luo X G; Tanatar M A; Reid J P; Shakeripour H; Doiron-Leyraud N; Ni N; Bud'ko S L; Canfield P C; Luo H Q; Wang Z S; Wen H H; Prozorov R; Taillefer L . 2009. Quasiparticle heat transport in single-crystalline Ba(1-x)KxFe(2)As(2): Evidence for a k-dependent superconducting gap without nodes. Physical Review B. 80:140503. abstract
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Ivanshin V A; Litvinova T O; Sukhanov A A; Sokolov D A; Aronson M C . 2009. Electron spin resonance in the Heusler alloy YbRh2Pb. Jetp Letters. 90:116-119. abstract
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Singh Y; Green M A; Huang Q; Kreyssig A; McQueeney R J; Johnston D C; Goldman A I . 2009. Magnetic order in BaMn2As2 from neutron diffraction measurements. Physical Review B. 80:100403. abstract
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Jia S; Ni N; Bud'ko S L; Canfield P C . 2009. Magnetic properties of RFe2Zn20 and RCo2Zn20 (R=Y, Nd, Sm, Gd-Lu). Physical Review B. 80:104403. abstract
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Williams T J; Aczel A A; Baggio-Saitovitch E; Bud'ko S L; Canfield P C; Carlo J P; Goko T; Munevar J; Ni N; Uemura Y J; Yu W; Luke G M . 2009. Muon spin rotation measurement of the magnetic field penetration depth in Ba(Fe0.926Co0.074)(2)As-2: Evidence for multiple superconducting gaps. Physical Review B. 80:094501. abstract
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Pratt D K; Tian W; Kreyssig A; Zarestky J L; Nandi S; Ni N; Bud'ko S L; Canfield P C; Goldman A I; McQueeney R J . 2009. Coexistence of Competing Antiferromagnetic and Superconducting Phases in the Underdoped Ba(Fe0.953Co0.047)(2)As-2 Compound Using X-ray and Neutron Scattering Techniques. Physical Review Letters. 103:087001. abstract
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Canfield P C . 2009. A cook's tale. Nature Physics. 5:529-530. abstract
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Kurmaev E Z; McLeod J A; Buling A; Skorikov N A; Moewes A; Neumann M; Korotin M A; Izyumov Y A; Ni N; Canfield P C . 2009. Contribution of Fe 3d states to the Fermi level of CaFe2As2. Physical Review B. 80:054508. abstract
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