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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Kong T; Cunningham C E; Taufour V; Bud'ko S L; Buffon M L C; Lin X; Emmons H; Canfield P C . 2014. Thermodynamic and transport properties of single crystalline RCo2Ge2 (R,Y, La-Nd, Sm-Tm). Journal of Magnetism and Magnetic Materials. 358:212-227. abstract
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Kazem N; Xie W W; Ohno S; Zevalkink A; Miller G J; Snyder G J; Kauzlarich S M . 2014. High-Temperature Thermoelectric Properties of the Solid-Solution Zintl Phase Eu11Cd6Sb12-xAsx (x < 3). Chemistry of Materials. 26:1393-1403. abstract
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Jesche A; Bud'ko S L; Canfield P C . 2014. Single crystal growth and characterization of the large-unit-cell compound Cu13Ba. Journal of Alloys and Compounds. 587:705-709. abstract
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Dhaka R S; Jiang R; Ran S; Bud'ko S L; Canfield P C; Harmon B N; Kaminski A; Tomic M; Valenti R; Lee Y B . 2014. Dramatic changes in the electronic structure upon transition to the collapsed tetragonal phase in CaFe2As2. Physical Review B. 89:020511. abstract
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Bud'ko S L; Chung D Y; Bugaris D; Claus H; Kanatzidis M G; Canfield P C . 2014. Heat capacity jump at T-c and pressure derivatives of superconducting transition temperature in the Ba1-xNaxFe2As2 (0.1 <= x <= 0.9) series. Physical Review B. 89:014510. abstract
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Kogan V G; Mints R G . 2014. Interaction of Josephson junction and distant vortex in narrow thin-film superconducting strips. Physical Review B. 89:014516. abstract
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Kogan V G; Prozorov R; Mishra V . 2013. London penetration depth and pair breaking. Physical Review B. 88:224508. abstract
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Yeninas S; Pandey A; Ogloblichev V; Mikhalev K; Johnston D C; Furukawa Y . 2013. Metal-insulator transition in antiferromagnetic Ba1-xKxMn2As2 (0 <= x <= 0.4) single crystals studied by Mn-55 and As-75 NMR. Physical Review B. 88:241111. abstract
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Yuen C D; Miller G J; Lei H P; Wang C Z; Thiel P A . 2013. Structure of the clean Gd5Ge4(010) surface. Journal of Physics-Condensed Matter. 25:485002. abstract
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Dioguardi A P; Crocker J; Shockley A C; Lin C H; Shirer K R; Nisson D M; Lawson M M; apRoberts-Warren N; Canfield P C; Bud'ko S L; Ran S; Curro N J . 2013. Coexistence of Cluster Spin Glass and Superconductivity in Ba(Fe1-xCox)(2)As-2 for 0.060 <= x <= 0.071. Physical Review Letters. 111:207201. abstract
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