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; Ran S; Canfield P C . 2013. Thermal expansion of CaFe2As2: Effect of cobalt doping and postgrowth thermal treatment. Physical Review B. 88:064513. abstract
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Pandey A; Ueland B G; Yeninas S; Kreyssig A; Sapkota A; Zhao Y; Helton J S; Lynn J W; McQueeney R J; Furukawa Y; Goldman A I; Johnston D C . 2013. Coexistence of Half-Metallic Itinerant Ferromagnetism with Local-Moment Antiferromagnetism in Ba0.60K0.40Mn2As2. Physical Review Letters. 111:047001. abstract
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Pandey A; Quirinale D G; Jayasekara W; Sapkota A; Kim M G; Dhaka R S; Lee Y; Heitmann T W; Stephens P W; Ogloblichev V; Kreyssig A; McQueeney R J; Goldman A I; Kaminski A; Harmon B N; Furukawa Y; Johnston D C . 2013. Crystallographic, electronic, thermal, and magnetic properties of single-crystal SrCo2As2. Physical Review B. 88:014526. abstract
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Prozorov R; Cho K; Kim H; Tanatar M A . 2013. Dome - like variation of the superconducting gap anisotropy in Fe-based superconductors. 10th International Conference on Materials and Mechanisms of Superconductivity. 449:012020. abstract
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McLeod J A; Kurmaev E Z; Perez I; Anand V K; Perera P K; Johnston D C; Moewes A . 2013. Electronic structure of copper pnictides: Influence of different cations and pnictogens. Physical Review B. 88:014508. abstract
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Hardy F; Bohmer A E; Aoki D; Burger P; Wolf T; Schweiss P; Heid R; Adelmann P; Yao Y X; Kotliar G; Schmalian J; Meingast C . 2013. Evidence of Strong Correlations and Coherence-Incoherence Crossover in the Iron Pnictide Superconductor KFe2As2. Physical Review Letters. 111:027002. abstract
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Kogan V G; Prozorov R . 2013. Orbital upper critical field of type-II superconductors with pair breaking. Physical Review B. 88:024503. abstract
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Kim S K; Torikachvili M S; Budko S L; Canfield P C . 2013. Search for pressure-induced quantum criticality in YbFe2Zn20. Physical Review B. 88:045116. abstract
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Dhaka R S; Lee Y; Anand V K; Johnston D C; Harmon B N; Kaminski A . 2013. Angle-resolved photoemission spectroscopy study of BaCo2As2. Physical Review B. 87:214516. abstract
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Kogan V G . 2013. Homes scaling and BCS. Physical Review B. 87:220507. abstract
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