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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Tanatar M A; Reid J P; de Cotret S R; Doiron-Leyraud N; Laliberte F; Hassinger E; Chang J; Kim H; Cho K; Song Y J; Kwon Y S; Prozorov R; Taillefer L . 2011. Isotropic three-dimensional gap in the iron arsenide superconductor LiFeAs from directional heat transport measurements. Physical Review B. 84:054507. abstract
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Prommapan P; Tanatar M A; Lee B; Khim S; Kim K H; Prozorov R . 2011. Magnetic-field-dependent pinning potential in LiFeAs superconductor from its Campbell penetration depth. Physical Review B. 84:060509. abstract
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Barannik A A; Cherpak N T; Ni N; Tanatar M A; Vitusevich S A; Skresanov V N; Canfield P C; Prozorov R; Glamazdin V V; Torokhtii K I . 2011. Millimeter-wave study of London penetration depth temperature dependence in Ba(Fe(0.926)Co(0.074))(2)As(2) single crystal. Low Temperature Physics. 37:725-728. abstract
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Colombier E; Knebel G; Salce B; Mun E D; Lin X; Bud'ko S L; Canfield P C . 2011. Phase diagram of CeVSb(3) under pressure and its dependence on pressure conditions. Physical Review B. 84:064442. abstract
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Larbalestier D; Canfield P C . 2011. Superconductivity at 100-Where we've been and where we're going. MRS Bulletin. 36:590-595. abstract
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Ni N; Bud'ko S L . 2011. Tuning the ground state of BaFe(2)As(2): Phase diagrams and empirical trends. MRS Bulletin. 36:620-625. abstract
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Gasparov V A; Drigo L; Audouard A; Sun D L; Lin C T; Bud'ko S L; Canfield P C; Fabris F W; Wosnitza J . 2011. Upper critical magnetic field in Ba(0.68)K(0.32)Fe(2)As(2) and Ba(Fe(0.93)Co(0.07))(2)As(2). JETP Letters. 93:667-672. abstract
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Wang P; Stadnik Z M; Zukrowski J; Thaler A; Bud'ko S L; Canfield P C . 2011. Coexistence of antiferromagnetic ordering and superconductivity in the Ba(Fe(0.961)Rh(0.039))(2)As(2) compound studied by Mossbauer spectroscopy. Physical Review B. 84:024509. abstract
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Goldman A I; Kreyssig A; Nandi S; Kim M G; Caudle M L; Canfield P C . 2011. High-energy X-ray diffraction studies of i-Sc12Zn88. Philosophical Magazine. 91:2427-2433. abstract
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Liu C; Palczewski A D; Dhaka R S; Kondo T; Fernandes R M; Mun E D; Hodovanets H; Thaler A N; Schmalian J; Bud'ko S L; Canfield P C; Kaminski A . 2011. Importance of the Fermi-surface topology to the superconducting state of the electron-doped pnictide Ba(Fe(1-x)Co(x))(2)As(2). Physical Review B. 84:020509. abstract
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