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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Brgoch J; Ran S; Thimmaiah S; Canfield P C; Miller G J . 2013. Determination of a new structure type in the Sc-Fe-Ge-Sn system. Journal of Alloys and Compounds. 546:300-306. abstract
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Clem J R . 2013. Inductances and attenuation constant for a thin-film superconducting coplanar waveguide resonator. Journal of Applied Physics. 113:013910. abstract
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Barannik A; Cherpak N T; Tanatar M A; Vitusevich S; Skresanov V; Canfield P C; Prozorov R . 2013. Millimeter-wave surface impedance of optimally-doped Ba(Fe1-xCox)(2)As-2 single crystals. Physical Review B. 87:014506. abstract
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Denys R V; Zavaliy I Y; Berezovets V V; Paul-Boncour V; Pecharsky V K . 2013. Phase equilibria in the Mg-Ti-Ni system at 500 degrees C and hydrogenation properties of selected alloys. Intermetallics. 32:167-175. abstract
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Kogan V G . 2013. Vortex-induced strain and magnetization in type-II superconductors. Physical Review B. 87:020503. abstract
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Samal S L; Pandey A; Johnston D C; Corbett J D . 2013. Y3MnAu5: Three Distinctive d-Metal Functions in an Intergrown Cluster Phase. Journal of the American Chemical Society. 135:910-917. abstract
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Bud'ko S L; Canfield P C . 2012. Frequency dependence of the spin glass freezing temperatures in icosahedral R-Mg-Zn (R = rare earth) quasicrystals. Philosophical Magazine. 92:4492-4497. abstract
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Lippman T M; Kalisky B; Kim H; Tanatar M A; Bud'ko S L; Canfield P C; Prozorov R; Moler K A . 2012. Agreement between local and global measurements of the London penetration depth. Physica C-Superconductivity and Its Applications. 483:91-93. abstract
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Bud'ko S L; Liu Y; Lograsso T A; Canfield P C . 2012. Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe2As2 single crystals. Physical Review B. 86:224514. abstract
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Gati E; Kohler S; Guterding D; Wolf B; Knoner S; Ran S; Bud'ko S L; Canfield P C; Lang M . 2012. Hydrostatic-pressure tuning of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe1-xCox)(2)As-2. Physical Review B. 86:220511. abstract
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