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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Sadleir J E; Smith S J; Bandler S R; Chervenak J A; Clem J R . 2010. Longitudinal Proximity Effects in Superconducting Transition-Edge Sensors. Physical Review Letters. 104:047003. abstract
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Chuang T M; Allan M P; Lee J; Xie Y; Ni N; Bud'ko S L; Boebinger G S; Canfield P C; Davis J C . 2010. Nematic Electronic Structure in the "Parent" State of the Iron-Based Superconductor Ca(Fe1-xCox)(2)As-2. Science. 327:181-184. abstract
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Canfield P C; Caudle M L; Ho C S; Kreyssig A; Nandi S; Kim M G; Lin X; Kracher A; Dennis K W; McCallum R W; Goldman A I . 2010. Solution growth of a binary icosahedral quasicrystal of Sc12Zn88. Physical Review B. 81:020201. abstract
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Kogan V G . 2009. Pair breaking in iron pnictides. Physical Review B. 80:214532. abstract
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Yan J Q; Nandi S; Zarestky J L; Tian W; Kreyssig A; Jensen B; Kracher A; Dennis K W; McQueeney R J; Goldman A I; McCallum R W; Lograsso T A . 2009. Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO1-xFx, and LaFe1-xCoxAsO. Applied Physics Letters. 95:222504. abstract
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Kondo T; Khasanov R; Sassa Y; Bendounan A; Pailhes S; Chang J; Mesot J; Keller H; Zhigadlo N D; Shi M; Bukowski Z; Karpinski J; Kaminski A . 2009. Anomalous asymmetry in the Fermi surface of the high-temperature superconductor YBa2Cu4O8 revealed by angle-resolved photoemission spectroscopy. Physical Review B. 80:100505. abstract
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Clem J R . 2009. Field and current distributions and ac losses in superconducting strips. Physical Review B. 80:184517. abstract
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Prozorov R; Tanatar M A; Ni N; Kreyssig A; Nandi S; Bud'ko S L; Goldman A I; Canfield P C . 2009. Intrinsic pinning on structural domains in underdoped single crystals of Ba(Fe1-xCox)(2)As-2. Physical Review B. 80:174517. abstract
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Torikachvili M S; Bud'ko S L; Ni N; Canfield P C . 2009. Hydrostatic pressure study of the structural phase transitions and superconductivity in single crystals of (Ba1-xKx)Fe2As2 (x=0 and 0.45) and CaFe2As2. Physica B-Condensed Matter. 404:3223-3226. abstract
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Szabo P; Pribulova Z; Pristas G; Bud'ko S L; Canfield P C; Samuely P . 2009. Two gap superconductivity in Ba0.55K0.45Fe2As2 single crystals studied by the directional point-contact Andreev reflection spectroscopy. Physica B-Condensed Matter. 404:3220-3222. abstract
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