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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Samuely P; Szabo P; Pribulova Z; Tillman M E; Bud'ko S L; Canfield P C . 2009. Possible two-gap superconductivity in NdFeAsO0.9F0.1 probed by point-contact Andreev-reflection spectroscopy. Superconductor Science & Technology. 22:014003. abstract
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Moshe M; Kogan V G; Mints R G . 2009. Thin-film Josephson junctions with alternating critical current density. Physical Review B. 79:024505. abstract
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Pribulova Z; Klein T; Kacmarcik J; Marcenat C; Konczykowski M; Bud'ko S L; Tillman M; Canfield P C . 2009. Upper and lower critical magnetic fields of superconducting NdFeAsO1-xFx single crystals studied by Hall-probe magnetization and specific heat. Physical Review B. 79:020508. abstract
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Yang X; Riseborough P S; Durakiewicz T; Olson C G; Joyce J J; Bauer E D; Sarrao J L; Moore D P; Graham K S; Elgazzar S; Oppeneer P M; Guziewicz E; Butterfield M T . 2009. Unusual quasiparticle renormalizations from angle resolved photoemission on USb2. Philosophical Magazine. 89:1893-1911. abstract
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Altarawneh M M; Collar K; Mielke C H; Ni N; Bud'ko S L; Canfield P C . 2008. Determination of anisotropic H-c2 up to 60 T in Ba0.55K0.45Fe2As2 single crystals. Physical Review B. 78:220505. abstract
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Ni N; Tillman M E; Yan J Q; Kracher A; Hannahs S T; Bud'ko S L; Canfield P C . 2008. Effects of Co substitution on thermodynamic and transport properties and anisotropic H-c2 in Ba(Fe1-xCox)(2)As-2 single crystals. Physical Review B. 78:214515. abstract
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Choi K Y; Wulferding D; Lemmens P; Ni N; Bud'ko S L; Canfield P C . 2008. Lattice and electronic anomalies of CaFe2As2 studied by Raman spectroscopy. Physical Review B. 78:212503. abstract
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Aczel A A; Baggio-Saitovitch E; Budko S L; Canfield P C; Carlo J P; Chen G F; Dai P C; Goko T; Hu W Z; Luke G M; Luo J L; Ni N; Sanchez-Candela D R; Tafti F F; Wang N L; Williams T J; Yu W; Uemura Y J . 2008. Muon-spin-relaxation studies of magnetic order and superfluid density in antiferromagnetic NdFeAsO, BaFe2As2, and superconducting Ba1-xKxFe2As2. Physical Review B. 78:214503. abstract
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Belashchenko K D; Antropov V P . 2008. Role of covalent Fe-As bonding in the magnetic moment formation and exchange mechanisms in iron-pnictide superconductors. Physical Review B. 78:212505. abstract
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Prozorov R; Ni N; Tanatar M A; Kogan V G; Gordon R T; Martin C; Blomberg E C; Prommapan P; Yan J Q; Bud'ko S L; Canfield P C . 2008. Vortex phase diagram of Ba(Fe0.93Co0.07)(2)As-2 single crystals. Physical Review B. 78:224506. abstract
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